Professor Cedric Lacey's Outputs (192)

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 complex interplay of AGN jet-inflated bubbles and the intracluster medium (2023)
Journal Article
Huško, F., & Lacey, C. G. (2023). The complex interplay of AGN jet-inflated bubbles and the intracluster medium. Monthly Notices of the Royal Astronomical Society, 521(3), 4375-4394. https://doi.org/10.1093/mnras/stad793

We use SWIFT, a smoothed particle hydrodynamics code, to simulate the evolution of bubbles inflated by active galactic nuclei (AGNs) jets, as well as their interactions with the ambient intracluster medium (ICM). These jets inflate lobes that turn in... Read More about The complex interplay of AGN jet-inflated bubbles and the intracluster medium.

Active galactic nuclei jets simulated with smoothed particle hydrodynamics (2023)
Journal Article
Huško, F., & Lacey, C. G. (2023). Active galactic nuclei jets simulated with smoothed particle hydrodynamics. Monthly Notices of the Royal Astronomical Society, 520(4), 5090-5109. https://doi.org/10.1093/mnras/stad450

Simulations of active galactic nuclei (AGN) jets have thus far been performed almost exclusively using grid-based codes. We present the first results from hydrodynamical tests of AGN jets, and their interaction with the intracluster medium (ICM), usi... Read More about Active galactic nuclei jets simulated with smoothed particle hydrodynamics.

QWIND3: UV line-driven accretion disc wind models for AGN feedback (2022)
Journal Article
Quera-Bofarull, A., Done, C., Lacey, C. G., Nomura, M., & Ohsuga, K. (2023). QWIND3: UV line-driven accretion disc wind models for AGN feedback. Monthly Notices of the Royal Astronomical Society, 518(2), 2693-2711. https://doi.org/10.1093/mnras/stac3171

The ultraviolet (UV) bright accretion disc in active galactic nuclei (AGNs) should give rise to line driving, producing a powerful wind that may play an important role in AGN feedback as well as in producing structures like the broad-line region. How... Read More about QWIND3: UV line-driven accretion disc wind models for AGN feedback.

The buildup of galaxies and their spheroids: The contributions of mergers, disc instabilities, and star formation (2022)
Journal Article
Huško, F., Lacey, C. G., & Baugh, C. M. (2023). The buildup of galaxies and their spheroids: The contributions of mergers, disc instabilities, and star formation. Monthly Notices of the Royal Astronomical Society, 518(4), 5323-5339. https://doi.org/10.1093/mnras/stac3152

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.

Spin-driven jet feedback in idealized simulations of galaxy groups and clusters (2022)
Journal Article
Huško, F., Lacey, C. G., Schaye, J., Schaller, M., & Nobels, F. S. (2022). Spin-driven jet feedback in idealized simulations of galaxy groups and clusters. Monthly Notices of the Royal Astronomical Society, 516(3), 3750 - 3772. https://doi.org/10.1093/mnras/stac2278

We implement a black hole spin evolution and jet feedback model into SWIFT, a smoothed particle hydrodynamics code. The jet power is determined self-consistently assuming that the black hole accretion rate is equal to the Bondi rate (i.e. the accreti... Read More about Spin-driven jet feedback in idealized simulations of galaxy groups and clusters.

The spatial distribution of satellites in galaxy clusters (2022)
Journal Article
Gu, Q., Guo, Q., Zhang, T., Cautun, M., Lacey, C., Frenk, C. S., & Shao, S. (2022). The spatial distribution of satellites in galaxy clusters. Monthly Notices of the Royal Astronomical Society, 514(1), 390-402. https://doi.org/10.1093/mnras/stac1292

The planar distributions of satellite galaxies around the Milky Way and Andromeda have been extensively studied as potential challenges to the standard cosmological model. Using the Sloan Digital Sky Survey and the Millennium simulation, we extend su... Read More about The spatial distribution of satellites in galaxy clusters.

Halo merger tree comparison: impact on galaxy formation models (2021)
Journal Article
Gómez, J. S., Padilla, N., Helly, J., Lacey, C., Baugh, C., & Lagos, C. (2022). Halo merger tree comparison: impact on galaxy formation models. Monthly Notices of the Royal Astronomical Society, 510(4), 5500-5519. https://doi.org/10.1093/mnras/stab3661

We examine the effect of using different halo finders and merger tree building algorithms on galaxy properties predicted using the GALFORM semi-analytical model run on a high resolution, large volume dark matter simulation. The halo finders/tree buil... Read More about Halo merger tree comparison: impact on galaxy formation models.

Modelling emission lines in star-forming galaxies (2021)
Journal Article
Baugh, C., Lacey, C. G., Gonzalez-Perez, V., & Manzoni, G. (2022). Modelling emission lines in star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 510(2), 1880-1893. https://doi.org/10.1093/mnras/stab3506

We present a new model to compute the luminosity of emission lines in star-forming galaxies and apply this in the semi-analytical galaxy formation code GALFORM. The model combines a pre-computed grid of H II region models with an empirical determinat... Read More about Modelling emission lines in star-forming galaxies.

Statistics of galaxy mergers: bridging the gap between theory and observation (2021)
Journal Article
Huško, F., Lacey, C. G., & Baugh, C. M. (2021). Statistics of galaxy mergers: bridging the gap between theory and observation. Monthly Notices of the Royal Astronomical Society, 509(4), 5918-5937. https://doi.org/10.1093/mnras/stab3324

We present a study of galaxy mergers up to z = 10 using the Planck Millennium cosmological dark matter simulation and the GALFORM semi-analytical model of galaxy formation. Utilizing the full 800 Mpc3 volume of the simulation, we studied the statisti... Read More about Statistics of galaxy mergers: bridging the gap between theory and observation.

Efficient exploration and calibration of a semi-analytical model of galaxy formation with deep learning (2021)
Journal Article
Elliott, E. J., Baugh, C. M., & Lacey, C. G. (2021). Efficient exploration and calibration of a semi-analytical model of galaxy formation with deep learning. Monthly Notices of the Royal Astronomical Society, 506(3), 4011-4030. https://doi.org/10.1093/mnras/stab1837

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
Gurung-López, S., Saito, S., Baugh, C. M., Bonoli, S., Lacey, C. G., & Orsi, Á. A. (2021). Determining the systemic redshift of Lyman α emitters with neural networks and improving the measured large-scale clustering. Monthly Notices of the Royal Astronomical Society, 500(1), 603-626. https://doi.org/10.1093/mnras/staa3269

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.

Are Lyα emitters segregated in protoclusters regions? (2020)
Journal Article
Hough, T., Gurung-López, S., Orsi, Á., Cora, S. A., Lacey, C. G., & Baugh, C. M. (2020). Are Lyα emitters segregated in protoclusters regions?. Monthly Notices of the Royal Astronomical Society, 499(2), 2104-2115. https://doi.org/10.1093/mnras/staa3027

The presence of neutral hydrogen in the inter-stellar medium (ISM) and inter-galactic medium (IGM) induces radiative transfer (RT) effects on Lyα photons which affect the observability of Lyα emitters (LAEs). We use the GALFORM semi-analytic model of... Read More about Are Lyα emitters segregated in protoclusters regions?.

Galaxy properties in the cosmic web of EAGLE simulation (2020)
Journal Article
Xu, W., Guo, Q., Zheng, H., Gao, L., Lacey, C., Gu, Q., …Chen, X. (2020). Galaxy properties in the cosmic web of EAGLE simulation. Monthly Notices of the Royal Astronomical Society, 498(2), 1839-1851. https://doi.org/10.1093/mnras/staa2497

We investigate the dependence of the galaxy properties on cosmic web environments using the most up-to-date hydrodynamic simulation: Evolution and Assembly of Galaxies and their Environments (EAGLE). The baryon fractions in haloes and the amplitudes... Read More about Galaxy properties in the cosmic web of EAGLE simulation.

Do model emission line galaxies live in filaments at z∼1? (2020)
Journal Article
Gonzalez-Perez, V., Cui, W., Contreras, S., Baugh, C., Comparat, J., Griffin, A., …Norberg, P. (2020). Do model emission line galaxies live in filaments at z∼1?. Monthly Notices of the Royal Astronomical Society, 498(2), 1852-1870. https://doi.org/10.1093/mnras/staa2504

Current and future cosmological surveys are targeting star-forming galaxies at z∼ 1 with nebular emission lines. We use a state-of-the-art semi-analytical model of galaxy formation and evolution to explore the large scale environment of star-forming... Read More about Do model emission line galaxies live in filaments at z∼1?.

Qwind code release. A non-hydrodynamical approach to modelling line-driven winds in active galactic nuclei (2020)
Journal Article
Elvis, M., Risaliti, G., McDowell, J. C., Lacey, C., Done, C., & Quera-Bofarull, A. (2020). Qwind code release. A non-hydrodynamical approach to modelling line-driven winds in active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 495(1), 402-412. https://doi.org/10.1093/mnras/staa1117

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.

AGNs at the cosmic dawn: predictions for future surveys from a ΛCDM cosmological model (2020)
Journal Article
Griffin, A. J., Lacey, C. G., Gonzalez-Perez, V., Lagos, C. D. P., Baugh, C. M., & Fanidakis, N. (2020). AGNs at the cosmic dawn: predictions for future surveys from a ΛCDM cosmological model. Monthly Notices of the Royal Astronomical Society, 492(2), 2535-2552. https://doi.org/10.1093/mnras/staa024

Telescopes to be launched over the next decade-and-a-half, such as JWST, EUCLID, ATHENA and Lynx, promise to revolutionise the study of the high redshift Universe and greatly advance our understanding of the early stages of galaxy formation. We use a... Read More about AGNs at the cosmic dawn: predictions for future surveys from a ΛCDM cosmological model.

Lyα emitters in a cosmological volume II: the impact of the intergalactic medium (2019)
Journal Article
Gurung-López, S., Orsi, Á. A., Bonoli, S., Padilla, N., Lacey, C. G., & Baugh, C. M. (2020). Lyα emitters in a cosmological volume II: the impact of the intergalactic medium. Monthly Notices of the Royal Astronomical Society, 491(3), 3266-3289. https://doi.org/10.1093/mnras/stz3204

In the near future galaxy surveys will target Lyman alpha emitting galaxies (LAEs) to unveil the nature of dark energy. It has been suggested that the observability of LAEs is coupled to the large scale properties of the intergalactic medium. Such co... Read More about Lyα emitters in a cosmological volume II: the impact of the intergalactic medium.