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Winds versus jets: a comparison between black hole feedback modes in simulations of idealized galaxy groups and clusters (2023)
Journal Article
Huško, F., Lacey, C. G., Schaye, J., Nobels, F. S. J., & Schaller, M. (2024). Winds versus jets: a comparison between black hole feedback modes in simulations of idealized galaxy groups and clusters. Monthly Notices of the Royal Astronomical Society, 527(3), 5988–6020. https://doi.org/10.1093/mnras/stad3548

Using the SWIFT simulation code, we compare the effects of different forms of active galactic nuclei (AGNs) feedback in idealized galaxy groups and clusters. We first present a physically motivated model of black hole (BH) spin evolution and a numeri... Read More about Winds versus jets: a comparison between black hole feedback modes in simulations of idealized galaxy groups and clusters.

FLAMINGO: calibrating large cosmological hydrodynamical simulations with machine learning. (2023)
Journal Article
Kugel, R., Schaye, J., Schaller, M., Helly, J. C., Braspenning, J., Elbers, W., …Vernon, I. (2023). FLAMINGO: calibrating large cosmological hydrodynamical simulations with machine learning. Monthly Notices of the Royal Astronomical Society, 526(4), 6103-6127. https://doi.org/10.1093/mnras/stad2540

To fully take advantage of the data provided by large-scale structure surveys, we need to quantify the potential impact of baryonic effects, such as feedback from active galactic nuclei (AGN) and star formation, on cosmological observables. In simula... Read More about FLAMINGO: calibrating large cosmological hydrodynamical simulations with machine learning..

The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys (2023)
Journal Article
Schaye, J., Kugel, R., Schaller, M., Helly, . J. C., Braspenning, J., Elbers, W., …Nobels, F. S. J. (2023). The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys. Monthly Notices of the Royal Astronomical Society, 526(4), 4978–5020. https://doi.org/10.1093/mnras/stad2419

We introduce the Virgo Consortium’s FLAMINGO suite of hydrodynamical simulations for cosmology and galaxy cluster physics. To ensure the simulations are sufficiently realistic for studies of large-scale structure, the subgrid prescriptions for stella... Read More about The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys.

The buildup of galaxies and their spheroids: The contributions of mergers, disc instabilities, and star formation (2022)
Journal Article

We use the GALFORM semi-analytical model of galaxy formation and the Planck-Millennium simulation to investigate the origins of stellar mass in galaxies and their spheroids. We compare the importance of mergers and disc instabilities, as well as the... Read More about The buildup of galaxies and their spheroids: The contributions of mergers, disc instabilities, and star formation.

Efficient exploration and calibration of a semi-analytical model of galaxy formation with deep learning (2021)
Journal Article

We implement a sample-efficient method for rapid and accurate emulation of semi-analytical galaxy formation models over a wide range of model outputs. We use ensembled deep learning algorithms to produce a fast emulator of an updated version of the G... Read More about Efficient exploration and calibration of a semi-analytical model of galaxy formation with deep learning.

Determining the systemic redshift of Lyman α emitters with neural networks and improving the measured large-scale clustering (2020)
Journal Article

We explore how to mitigate the clustering distortions in Lyman α emitter (LAE) samples caused by the misidentification of the Lyman α (⁠Lyα⁠) wavelength in their Lyα line profiles. We use the Lyα line profiles from our previous LAE theoretical model... Read More about Determining the systemic redshift of Lyman α emitters with neural networks and improving the measured large-scale clustering.

Qwind code release. A non-hydrodynamical approach to modelling line-driven winds in active galactic nuclei (2020)
Journal Article

UV line driven winds may be an important part of the AGN feedback process, but understanding their impact is hindered by the complex nature of the radiation hydrodynamics. Instead, we have taken the approach pioneered by Risaliti & Elvis, calculating... Read More about Qwind code release. A non-hydrodynamical approach to modelling line-driven winds in active galactic nuclei.

The evolution of the UV-to-mm extragalactic background light: evidence for a top-heavy initial mass function? (2019)
Journal Article

We present predictions for the UV-to-mm extragalactic background light (EBL) from a recent version of the GALFORM semi-analytical model of galaxy formation which invokes a top-heavy stellar initial mass function (IMF) for galaxies undergoing dynamica... Read More about The evolution of the UV-to-mm extragalactic background light: evidence for a top-heavy initial mass function?.

The evolution of SMBH spin and AGN luminosities for z < 6 within a semi-analytic model of galaxy formation (2019)
Journal Article

Understanding how Active Galactic Nuclei (AGN) evolve through cosmic time allows us to probe the physical processes that control their evolution. We use an updated model for the evolution of masses and spins of supermassive black holes (SMBHs), coupl... Read More about The evolution of SMBH spin and AGN luminosities for z < 6 within a semi-analytic model of galaxy formation.

JINGLE, a JCMT legacy survey of dust and gas for galaxy evolution studies – I. Survey overview and first results (2018)
Journal Article

JINGLE is a new JCMT legacy survey designed to systematically study the cold interstellar medium of galaxies in the local Universe. As part of the survey we perform 850 µm continuum measurements with SCUBA-2 for a representative sample of 193 Hersche... Read More about JINGLE, a JCMT legacy survey of dust and gas for galaxy evolution studies – I. Survey overview and first results.

The SCUBA-2 Cosmology Legacy Survey: The EGS deep field - II. Morphological transformation and multiwavelength properties of faint submillimetre galaxies (2018)
Journal Article

We present a multiwavelength analysis of galaxies selected at 450 and 850 μm from the deepest SCUBA-2 observations in the Extended Groth Strip (EGS) field, which have an average depth of σ450 = 1.9 and σ850 = 0.46 mJy beam− 1 over ∼70 arcmin2. The fi... Read More about The SCUBA-2 Cosmology Legacy Survey: The EGS deep field - II. Morphological transformation and multiwavelength properties of faint submillimetre galaxies.

Blending bias impacts the host halo masses derived from a cross-correlation analysis of bright submillimetre galaxies (2017)
Journal Article

Placing bright submillimetre galaxies (SMGs) within the broader context of galaxy formation and evolution requires accurate measurements of their clustering, which can constrain the masses of their host dark matter haloes. Recent work has shown that... Read More about Blending bias impacts the host halo masses derived from a cross-correlation analysis of bright submillimetre galaxies.

GAMA/H-ATLAS: common star formation rate indicators and their dependence on galaxy physical parameters (2016)
Journal Article

We compare common star formation rate (SFR) indicators in the local Universe in the Galaxy and Mass Assembly (GAMA) equatorial fields (∼160 deg2), using ultraviolet (UV) photometry from GALEX, far-infrared and sub-millimetre (sub-mm) photometry from... Read More about GAMA/H-ATLAS: common star formation rate indicators and their dependence on galaxy physical parameters.

A hybrid multiresolution scheme to efficiently model the structure of reionization on the largest scales (2015)
Journal Article

Redshifted 21-cm measurements of the structure of ionized regions that grow during reionization promise to provide a new probe of early galaxy and structure formation. One of the challenges of modelling reionization is to account both for the subhalo... Read More about A hybrid multiresolution scheme to efficiently model the structure of reionization on the largest scales.

The origin of the atomic and molecular gas contents of early-type galaxies - II. Misaligned gas accretion (2015)
Journal Article

We study the origin of the wide distribution of angles between the angular momenta of the stellar and gas components, αG, S, in early-type galaxies (ETGs). We use the GALFORM model of galaxy formation, set in the Λ cold dark matter framework, and cou... Read More about The origin of the atomic and molecular gas contents of early-type galaxies - II. Misaligned gas accretion.

The environments of Ly α blobs I: Wide-field Ly α imaging of TN J1338-1942, a powerful radio galaxy at z ≃ 4.1 associated with a giant Ly α nebula (2015)
Journal Article

We exploit wide-field Ly α imaging with Subaru to probe the environment around TN J1338−1942, a powerful radio galaxy with a > 100 kpc Ly α halo at z = 4.11. We used a sample of Ly α emitters (LAEs) down to log (LLyα[ erg s−1]) ∼ 42.8 to measure the... Read More about The environments of Ly α blobs I: Wide-field Ly α imaging of TN J1338-1942, a powerful radio galaxy at z ≃ 4.1 associated with a giant Ly α nebula.

Evolution of the dust emission of massive galaxies up to z = 4 and constraints on their dominant mode of star formation (2015)
Journal Article

We aim to measure the average dust and molecular gas content of massive star-forming galaxies (>3 × 1010M⊙) up to z = 4 in the COSMOS field to determine if the intense star formation observed at high redshift is induced by major mergers or is caused... Read More about Evolution of the dust emission of massive galaxies up to z = 4 and constraints on their dominant mode of star formation.

Simulated observations of sub-millimetre galaxies: the impact of single-dish resolution and field variance (2014)
Journal Article

Recent observational evidence suggests that the coarse angular resolution [∼20 arcsec full width at half maximum (FWHM)] of single-dish telescopes at sub-mm wavelengths has biased the observed galaxy number counts by blending together the sub-mm emis... Read More about Simulated observations of sub-millimetre galaxies: the impact of single-dish resolution and field variance.

Galaxy And Mass Assembly (GAMA): the dependence of the galaxy luminosity function on environment, redshift and colour (2014)
Journal Article

We use 80 922 galaxies in the Galaxy And Mass Assembly (GAMA) survey to measure the galaxy luminosity function (LF) in different environments over the redshift range 0.04 < z < 0.26. The depth and size of GAMA allows us to define samples split by col... Read More about Galaxy And Mass Assembly (GAMA): the dependence of the galaxy luminosity function on environment, redshift and colour.

The origin of the atomic and molecular gas contents of early-type galaxies – I. A new test of galaxy formation physics (2014)
Journal Article

We study the atomic (H I) and molecular hydrogen (H2) contents of early-type galaxies (ETGs) and their gas sources using the GALFORM model of galaxy formation. This model uses a self-consistent calculation of the star formation rate, which depends on... Read More about The origin of the atomic and molecular gas contents of early-type galaxies – I. A new test of galaxy formation physics.

Clustering of extremely red objects in Elais-N1 from the UKIDSS DXS with optical photometry from Pan-STARRS 1 and Subaru (2014)
Journal Article

We measure the angular clustering of 33 415 extremely red objects (EROs) in the Elais-N1 field covering 5.33 deg2, which cover the redshift range z = 0.8 to 2. This sample was made by merging the UKIDSS Deep eXtragalactic Survey (DXS) with the optica... Read More about Clustering of extremely red objects in Elais-N1 from the UKIDSS DXS with optical photometry from Pan-STARRS 1 and Subaru.

Variation in the escape fraction of ionizing photons from galaxies and the redshifted 21-cm power spectrum during reionization (2013)
Journal Article

The observed power spectrum of redshifted 21-cm fluctuations is known to be sensitive to the astrophysical properties of the galaxies that drove reionization. Thus, detailed measurements of the 21-cm power spectrum and its evolution could lead to mea... Read More about Variation in the escape fraction of ionizing photons from galaxies and the redshifted 21-cm power spectrum during reionization.

The SCUBA-2 cosmology legacy survey : blank-field number counts of 450-μm-selected galaxies and their contribution to the cosmic infrared background (2013)
Journal Article

The first deep blank-field 450 μm map (1σ ≈ 1.3 mJy) from the Submillimetre Common-User Bolometer Array-2 SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin2 of the... Read More about The SCUBA-2 cosmology legacy survey : blank-field number counts of 450-μm-selected galaxies and their contribution to the cosmic infrared background.

On the role of feedback in shaping the cosmic abundance and clustering of neutral atomic hydrogen in galaxies (2013)
Journal Article

We investigate the impact of feedback – from supernovae (SNe), active galactic nuclei (AGN) and a photoionizing background at high redshifts – on the neutral atomic hydrogen (H I) mass function, the bJ-band luminosity function, and the spatial cluste... Read More about On the role of feedback in shaping the cosmic abundance and clustering of neutral atomic hydrogen in galaxies.

Lightcone mock catalogues from semi-analytic models of galaxy formation - I. Construction and application to the BzK colour selection (2013)
Journal Article

We introduce a method for constructing end-to-end mock galaxy catalogues using a semi-analytical model of galaxy formation, applied to the halo merger trees extracted from a cosmological N-body simulation. The mocks that we construct are lightcone ca... Read More about Lightcone mock catalogues from semi-analytic models of galaxy formation - I. Construction and application to the BzK colour selection.

Predictions for the CO emission of galaxies from a coupled simulation of galaxy formation and photon-dominated regions (2012)
Journal Article

We combine the galaxy formation model GALFORM with the photon-dominated region code UCL−PDR to study the emission from the rotational transitions of 12CO (CO) in galaxies from z = 0 to z = 6 in the Λcold dark matter framework. GALFORM is used to pred... Read More about Predictions for the CO emission of galaxies from a coupled simulation of galaxy formation and photon-dominated regions.

Predictions for the intrinsic UV continuum properties of star-forming galaxies and the implications for inferring dust extinction (2012)
Journal Article

The observed ultraviolet continuum (UVC) slope is potentially a powerful diagnostic of dust obscuration in star-forming galaxies. However, the intrinsic slope is also sensitive to the form of the stellar initial mass function and to the recent star f... Read More about Predictions for the intrinsic UV continuum properties of star-forming galaxies and the implications for inferring dust extinction.

The LABOCA survey of the Extended Chandra Deep Field-South : a photometric redshift survey of submillimetre galaxies (2011)
Journal Article

We derive photometric redshifts from 17-band optical to mid-infrared photometry of 78 robust radio, 24-μm and Spitzer IRAC counterparts to 72 of the 126 submillimetre galaxies (SMGs) selected at 870 μm by LABOCA observations in the Extended Chandra D... Read More about The LABOCA survey of the Extended Chandra Deep Field-South : a photometric redshift survey of submillimetre galaxies.

Probing dark energy with future redshift surveys: a comparison of emission line and broad-band selection in the near-infrared (2010)
Journal Article

Future galaxy surveys will map the galaxy distribution in the redshift interval 0.5 < z < 2 using near-infrared cameras and spectrographs. The primary scientific goal of such surveys is to constrain the nature of the dark energy by measuring the larg... Read More about Probing dark energy with future redshift surveys: a comparison of emission line and broad-band selection in the near-infrared.

The Herschel ATLAS (2010)
Journal Article

The Herschel ATLAS is the largest open-time key project that will be carried out on the Herschel Space Observatory. It will survey 570 deg2 of the extragalactic sky, 4 times larger than all the other Herschel extragalactic surveys combined, in five f... Read More about The Herschel ATLAS.

Modelling the dusty universe - I. Introducing the artificial neural network and first applications to luminosity and colour distributions (2010)
Journal Article

We introduce a new technique based on artificial neural networks which enable us to make accurate predictions for the spectral energy distributions (SEDs) of large samples of galaxies, at wavelengths ranging from the far-ultraviolet (UV) to the submi... Read More about Modelling the dusty universe - I. Introducing the artificial neural network and first applications to luminosity and colour distributions.

Massive, red galaxies in a hierarchical universe – I. Counts of extremely red objects and basic properties (2009)
Journal Article

We present predictions for the abundance and nature of extremely red objects (EROs) in the Λ cold dark matter model. EROs are red, massive galaxies observed at z≥ 1 and their numbers and properties pose a challenge to hierarchical galaxy formation mo... Read More about Massive, red galaxies in a hierarchical universe – I. Counts of extremely red objects and basic properties.

Testing model predictions of the cold dark matter cosmology for the sizes, colours, morphologies and luminosities of galaxies with the SDSS (2009)
Journal Article

The huge size and uniformity of the Sloan Digital Sky Survey (SDSS) make possible an exacting test of current models of galaxy formation. We compare the predictions of the GALFORM semi-analytical galaxy formation model for the luminosities, morpholog... Read More about Testing model predictions of the cold dark matter cosmology for the sizes, colours, morphologies and luminosities of galaxies with the SDSS.

A population of faint extended line emitters and the host galaxies of optically thick QSO absorption systems (2008)
Journal Article

We have conducted a long-slit search for low surface brightness Lyα emitters at redshift 2.67 < z < 3.75. A 92 hr long exposure with the ESO VLT FORS2 instrument down to a 1 σ surface brightness detection limit of 8 × 10−20 erg cm−2 s−1 arcsec−2 per... Read More about A population of faint extended line emitters and the host galaxies of optically thick QSO absorption systems.

Galaxy evolution in the infrared : comparison of a hierarchical galaxy formation model with Spitzer data (2008)
Journal Article

We present predictions for the evolution of the galaxy luminosity function, number counts and redshift distributions in the infrared (IR) based on the ΛCDM cosmological model. We use the combined GALFORM semi-analytical galaxy formation model and GRA... Read More about Galaxy evolution in the infrared : comparison of a hierarchical galaxy formation model with Spitzer data.

The UDF05 follow-up of the Hubble Ultra Deep Field. I. The faint-end slope of the Lyman Break Galaxy Population at z ~ 5 (2007)
Journal Article

We present the UDF05 HST program, which consists of three disjoint fields—NICP12, NICP34, plus the HUDF—with deep ACS (F606W, F775W, and F850LP) and NICMOS (F110W and F160W) imaging. Here we use the ACS data for the NICP12 and HUDF fields to implemen... Read More about The UDF05 follow-up of the Hubble Ultra Deep Field. I. The faint-end slope of the Lyman Break Galaxy Population at z ~ 5.

The Nature of (Sub)millimeter Galaxies in Hierarchical Models (2007)
Conference Proceeding
Baugh, C. M., Lacey, C. G., Frenk, C. S., Granato, G. L., Silva, L., Bressan, A., …Cole, S. (2007). The Nature of (Sub)millimeter Galaxies in Hierarchical Models. In A. .. Baker, J. Glenn, A. Harris, J. .. Mangum, & M. .. Yun (Eds.),

Luminosity functions for galaxies and quasars in the Spitzer Wide-area Infrared Extragalactic Legacy Survey (2006)
Journal Article

We construct rest-frame luminosity functions (LFs) at 3.6, 4.5, 5.8, 8 and 24 μm over the redshift range 0 < z < 2 for galaxies and 0 < z < 4 for optical quasi-stellar objects (QSOs), using optical and infrared (IR) data from the Spitzer Wide-area In... Read More about Luminosity functions for galaxies and quasars in the Spitzer Wide-area Infrared Extragalactic Legacy Survey.

The epoch of reionization (2006)
Journal Article

We have modelled the process of reionization of the intergalactic medium (IGM) by photoionization by galaxies, in order to learn what galaxy formation in the framework of the cold dark matter (CDM) model predicts for the epoch of reionization. We use... Read More about The epoch of reionization.

The properties of Ly-alpha emitting galaxies in hierarchical galaxy formation models (2006)
Journal Article
Le Delliou, M., Lacey, C., Baugh, C., & Morris, S. (2006). The properties of Ly-alpha emitting galaxies in hierarchical galaxy formation models. Monthly Notices of the Royal Astronomical Society, 365(3), 712-726. https://doi.org/10.1111/j.1365-2966.2005.09797.x

We present detailed predictions for the properties of Lyα-emitting galaxies in the framework of the Λ cold dark matter cosmology, calculated using the semi-analytical galaxy formation model galform. We explore a model that assumes a top-heavy initial... Read More about The properties of Ly-alpha emitting galaxies in hierarchical galaxy formation models.

The SCUBA Half-Degree Extragalactic Survey — I. Survey motivation, design and data processing. (2005)
Journal Article
Mortier, A., Serjeant, S., Dunlop, J., Scott, S., Ade, P., Alexander, D., …Vaccari, M. (2005). The SCUBA Half-Degree Extragalactic Survey — I. Survey motivation, design and data processing. Monthly Notices of the Royal Astronomical Society, 363(2), 563-580. https://doi.org/10.1111/j.1365-2966.2005.09460.x

The Submillimetre Common-User Bolometer Array (SCUBA) Half-Degree Extragalactic Survey (SHADES) is a major new blank-field extragalactic submillimetre (submm) survey currently underway at the James Clerk Maxwell Telescope (JCMT). Ultimately, SHADES a... Read More about The SCUBA Half-Degree Extragalactic Survey — I. Survey motivation, design and data processing..

The metal enrichment of the intracluster medium in hierarchical galaxy formation models (2005)
Journal Article
Nagashima, M., Lacey, C., Baugh, C., Frenk, C., & Cole, S. (2005). The metal enrichment of the intracluster medium in hierarchical galaxy formation models. Monthly Notices of the Royal Astronomical Society, 358(4), 1247-1266. https://doi.org/10.1111/j.1365-2966.2005.08766.x

We investigate the metal enrichment of the intracluster medium (ICM) within the framework of hierarchical models of galaxy formation. We calculate the formation and evolution of galaxies and clusters using a semi-analytical model which includes the e... Read More about The metal enrichment of the intracluster medium in hierarchical galaxy formation models.

The abundance of Lyα emitters in hierarchical models (2005)
Journal Article
Le Delliou, M., Lacey, C., Baugh, C., Guiderdoni, B., Bacon, R., Courtois, H., …Morris, S. (2005). The abundance of Lyα emitters in hierarchical models. Monthly Notices of the Royal Astronomical Society, 357(1), L11-L15. https://doi.org/10.1111/j.1745-3933.2005.00007.x

We present predictions for the abundance of Lyα emitters in hierarchical structure formation models. We use the GALFORM semi-analytical model of galaxy formation to explore the impact on the predicted counts of varying assumptions about the escape fr... Read More about The abundance of Lyα emitters in hierarchical models.

Can the faint submillimetre galaxies be explained in the Λ cold dark matter model? (2005)
Journal Article
Baugh, C., Lacey, C., Frenk, C., Granato, G., Silva, L., Bressan, A., …Cole, S. (2005). Can the faint submillimetre galaxies be explained in the Λ cold dark matter model?. Monthly Notices of the Royal Astronomical Society, 356(3), 1191-1200. https://doi.org/10.1111/j.1365-2966.2004.08553.x

We present predictions for the abundance of submillimetre galaxies (SMGs) and Lyman-break galaxies (LBGs) in the Λ cold dark matter cosmology. A key feature of our model is the self-consistent calculation of the absorption and emission of radiation b... Read More about Can the faint submillimetre galaxies be explained in the Λ cold dark matter model?.

What shapes the luminosity function of galaxies? (2003)
Journal Article
Benson, A., Bower, R., Frenk, C., Lacey, C., Baugh, C., & Cole, S. (2003). What shapes the luminosity function of galaxies?. Astrophysical Journal, 599(1), 38-49. https://doi.org/10.1086/379160

We investigate the physical mechanisms that shape the luminosity function of galaxies in hierarchical clustering models. Beginning with the mass function of dark matter halos in the CDM ( cold dark matter) cosmology, we show, in incremental steps, ho... Read More about What shapes the luminosity function of galaxies?.

The halo occupation distribution and the physics of galaxy formation (2003)
Journal Article
Berlind, A., Weinberg, D., Benson, A., Baugh, C., Cole, S., Davé, R., …Lacey, C. (2003). The halo occupation distribution and the physics of galaxy formation. Astrophysical Journal, 593(1), 1-25. https://doi.org/10.1086/376517

The halo occupation distribution (HOD) describes the bias between galaxies and dark matter by specifying (1) the probability P(N|M) that a halo of virial mass M contains N galaxies of a particular class and (2) the relative spatial and velocity distr... Read More about The halo occupation distribution and the physics of galaxy formation.

On the origin of intracluster entropy (2003)
Journal Article
Voit, G., Balogh, M., Bower, R., Lacey, C., & Bryan, G. (2003). On the origin of intracluster entropy. Astrophysical Journal, 593(1), 272-290. https://doi.org/10.1086/376499

The entropy distribution of the intracluster medium and the shape of its confining potential well completely determine the X-ray properties of a relaxed cluster of galaxies, motivating us to explore the origin of intracluster entropy and to describe... Read More about On the origin of intracluster entropy.

The effects of photoionization on galaxy formation - III. Environmental dependence in the luminosity function (2003)
Journal Article
Benson, A., Frenk, C., Baugh, C., Cole, S., & Lacey, C. (2003). The effects of photoionization on galaxy formation - III. Environmental dependence in the luminosity function. Monthly Notices of the Royal Astronomical Society, 343(2), 679-691. https://doi.org/10.1046/j.1365-8711.2003.06709.x

Using semi-analytic modelling techniques, we calculate the luminosity function of galaxy populations residing in cold dark matter haloes of different masses. We pay particular attention to the influence of the re-ionization of the Universe on the num... Read More about The effects of photoionization on galaxy formation - III. Environmental dependence in the luminosity function.

The properties of spiral galaxies : confronting hierarchical galaxy formation models with observations (2003)
Journal Article

We compare the properties of local spiral galaxies with the predictions of the Cole et al. semi-analytic model of hierarchical galaxy formation, in order to gain insight into the baryonic processes, such as gas cooling and star formation, that were r... Read More about The properties of spiral galaxies : confronting hierarchical galaxy formation models with observations.

A comparison of gas dynamics in smooth particle hydrodynamics and semi-analytic models of galaxy formation (2003)
Journal Article
Helly, J., Cole, S., Frenk, C., Baugh, C., Benson, A., Lacey, C., & Pearce, F. (2003). A comparison of gas dynamics in smooth particle hydrodynamics and semi-analytic models of galaxy formation. Monthly Notices of the Royal Astronomical Society, 338(4), 913-925. https://doi.org/10.1046/j.1365-8711.2003.06152.x

We compare the results of two techniques used to calculate the evolution of cooling gas during galaxy formation: smooth particle hydrodynamics (SPH) simulations and semi-analytic modelling. We improve upon the earlier statistical comparison of Benson... Read More about A comparison of gas dynamics in smooth particle hydrodynamics and semi-analytic models of galaxy formation.

Statistics of neutral regions during hydrogen reionization (2002)
Journal Article
Nusser, A., Benson, A., Sugiyama, N., & Lacey, C. (2002). Statistics of neutral regions during hydrogen reionization. Astrophysical Journal Letters, 580(2), L93-L96. https://doi.org/10.1086/345655

We present predictions for two statistical measures of the hydrogen reionization process at high redshift. The first statistic is the number of neutral segments identified in spectra of high-redshift QSOs as a function of their length. The second is... Read More about Statistics of neutral regions during hydrogen reionization.

The effects of photoionization on galaxy formation - I. Model and results at z=0 (2002)
Journal Article
Benson, A., Lacey, C., Baugh, C., Cole, S., & Frenk, C. (2002). The effects of photoionization on galaxy formation - I. Model and results at z=0. Monthly Notices of the Royal Astronomical Society, 333(1), 156-176. https://doi.org/10.1046/j.1365-8711.2002.05387.x

We develop a coupled model for the evolution of the global properties of the intergalactic medium (IGM) and the formation of galaxies, in the presence of a photoionizing background due to stars and quasars. We use this model to predict the thermodyna... Read More about The effects of photoionization on galaxy formation - I. Model and results at z=0.

Polarization of the cosmic microwave background from nonuniform reionization (2001)
Journal Article
Liu, G., Sugiyama, N., Benson, A., Lacey, C., & Nusser, A. (2001). Polarization of the cosmic microwave background from nonuniform reionization. Astrophysical Journal, 561(2), 504-516. https://doi.org/10.1086/323255

We study the polarization anisotropy in the cosmic microwave background (CMB) resulting from patchy reionization of the intergalactic medium by stars in galaxies. It is well known that the polarization of the CMB is very sensitive to the details of r... Read More about Polarization of the cosmic microwave background from nonuniform reionization.

The local space density of SB-SDM galaxies as function of their scale size, surface brightness, and luminosity (2000)
Journal Article

We investigate the dependence of the local space density of spiral galaxies on luminosity, scale size, and surface brightness. We derive bivariate space density distributions in these quantities from a sample of about 1000 Sb-Sdm spiral galaxies, cor... Read More about The local space density of SB-SDM galaxies as function of their scale size, surface brightness, and luminosity.

Scaling laws in gravitational clustering for counts-in-cells and mass functions (2000)
Journal Article
Valageas, P., Lacey, C., & Schaeffer, R. (2000). Scaling laws in gravitational clustering for counts-in-cells and mass functions. Monthly Notices of the Royal Astronomical Society, 311(2), 234-250. https://doi.org/10.1046/j.1365-8711.2000.03054.x

We present an analysis of some of the properties of the density field realized in numerical simulations for power-law initial power spectra in the case of a critical density universe. We study the non-linear regime, which is the most difficult to han... Read More about Scaling laws in gravitational clustering for counts-in-cells and mass functions.

How dark matter halos cluster in Lagrangian space (1999)
Journal Article
Porciani, C., Catelan, P., & Lacey, C. (1999). How dark matter halos cluster in Lagrangian space. Astrophysical Journal Letters, 513(2), L99-L102. https://doi.org/10.1086/311922

We investigate the clustering of dark matter halos in Lagrangian space in terms of their two-point correlation function. Analyzing a set of collisionless scale-free 1283 particle N-body simulations with spectral indices n=-2, -1, we measure the first... Read More about How dark matter halos cluster in Lagrangian space.

The structure of dark matter haloes in hierarchical clustering models (1996)
Journal Article
Cole, S., & Lacey, C. (1996). The structure of dark matter haloes in hierarchical clustering models. Monthly Notices of the Royal Astronomical Society, 281(2), 716-736. https://doi.org/10.1093/mnras/281.2.716

We use a set of large cosmological N-body simulations to study the internal structure of dark matter haloes which form in scale-free hierarchical clustering models (initial power spectra P(k) ∞ kn with n = 0, −1 and −2) in an Ω = 1 universe. We find... Read More about The structure of dark matter haloes in hierarchical clustering models.

Merger rates in hierarchical models of galaxy formation - II. Comparison with N-body simulations (1994)
Journal Article
Lacey, C., & Cole, S. (1994). Merger rates in hierarchical models of galaxy formation - II. Comparison with N-body simulations. Monthly Notices of the Royal Astronomical Society, 271(3), 676-692. https://doi.org/10.1093/mnras/271.3.676

We have made a detailed comparison of the results of N-body simulations with the analytical description of the merging histories of dark matter haloes presented in Lacey & Cole, which is based on an extension of the Press-Schechter method. We find th... Read More about Merger rates in hierarchical models of galaxy formation - II. Comparison with N-body simulations.

Tidally triggered galaxy formation. I - Evolution of the galaxy luminosity function (1991)
Journal Article
Lacey, C., & Silk, J. (1991). Tidally triggered galaxy formation. I - Evolution of the galaxy luminosity function. Astrophysical Journal, 381, 14-32. https://doi.org/10.1086/170625

Motivated by accumulating evidence that large-scale galactic star formation is initiated and sustained by tidal interactions, a phenomenological model is developed for the galaxy luminosity function, commencing from a galaxy mass function that is pre... Read More about Tidally triggered galaxy formation. I - Evolution of the galaxy luminosity function.

Energetic constraints on spectral distortions of the microwave background (1988)
Journal Article
Lacey, C. G., & Field, G. B. (1988). Energetic constraints on spectral distortions of the microwave background. Astrophysical Journal, 330(7), L1-L4. https://doi.org/10.1086/185191

The energetic constraints on mechanisms for producing the spectral distortion of the microwave background claimed by Matsumoto et al., (1988) are investigated in the light of the new upper bounds on the cosmological baryon density derived by Kawano e... Read More about Energetic constraints on spectral distortions of the microwave background.

Chemical evolution of the galactic disk with radial gas flows (1985)
Journal Article
Lacey, C., & Fall, S. (1985). Chemical evolution of the galactic disk with radial gas flows. Astrophysical Journal, 290, 154-170. https://doi.org/10.1086/162970

Models are presented for the chemical evolution of the galactic disc with radial inflows of the gas at a velocity constant with time, but that may vary with the galactocentric radius. The models include the infall of metal-free gas from outside the d... Read More about Chemical evolution of the galactic disk with radial gas flows.

Kinematical and chemical evolution of the galactic disc (1983)
Journal Article
Lacey, C., & Fall, S. (1983). Kinematical and chemical evolution of the galactic disc. Monthly Notices of the Royal Astronomical Society, 204(3), 791-810. https://doi.org/10.1093/mnras/204.3.791

In the models presented here, metal-free gas accumulates in the galactic disc at a rate that decays exponentially on a time-scale tf. Stars then form with a constant initial mass function and a small velocity dispersion at a rate proportional to the... Read More about Kinematical and chemical evolution of the galactic disc.