Outputs (229)

Strong gravitational lensing’s ‘external shear’ is not shear (2024)
Journal Article
Etherington, A., Nightingale, J., Massey, R., Tam, S.-I., Cao, X., Niemiec, A., He, Q., Robertson, A., Li, R., Amvrosiadis, A., Cole, S., Diego, J., Frenk, C., Frye, B., Harvey, D., Jauzac, M., Koekemoer, A., Lagattuta, D., Lange, S., Limousin, M., …Steinhardt, C. (2024). Strong gravitational lensing’s ‘external shear’ is not shear. Monthly Notices of the Royal Astronomical Society, 531(3), 3684-3697. https://doi.org/10.1093/mnras/stae1375

The distribution of mass in galaxy-scale strong gravitational lenses is often modelled as an elliptical power-law plus ‘external shear’, which notionally accounts for neighbouring galaxies and cosmic shear along our line of sight. A small amount of e... Read More about Strong gravitational lensing’s ‘external shear’ is not shear.

DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data (2024)
Journal Article
McCullough, J., Gruen, D., Amon, A., Roodman, A., Masters, D., Raichoor, A., …DESI Collaboration. (2024). DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data. Monthly Notices of the Royal Astronomical Society, 531(2), 2582-2602. https://doi.org/10.1093/mnras/stae1316

We present initial results from the Dark Energy Spectroscopic Instrument (DESI) complete calibration of the colour–redshift relation (DC3R2) secondary target survey. Our analysis uses 230 k galaxies that overlap with KiDS-VIKING ugriZYJHKs photometry... Read More about DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data.

The DESI One-percent Survey: Evidence for Assembly Bias from Low-redshift Counts-in-cylinders Measurements (2024)
Journal Article
Pearl, A. N., Zentner, A. R., Newman, J. A., Bezanson, R., Wang, K., Moustakas, J., Aguilar, J. N., Ahlen, S., Brooks, D., Claybaugh, T., Cole, S., Dawson, K., de la Macorra, A., Doel, P., Forero-Romero, J. E., Gontcho A Gontcho, S., Honscheid, K., Landriau, M., Manera, M., Martini, P., …Zhou, Z. (2024). The DESI One-percent Survey: Evidence for Assembly Bias from Low-redshift Counts-in-cylinders Measurements. Astrophysical Journal, 963(2), Article 116. https://doi.org/10.3847/1538-4357/ad1ffd

We explore the galaxy-halo connection information that is available in low-redshift samples from the early data release of the Dark Energy Spectroscopic Instrument (DESI). We model the halo occupation distribution (HOD) from z = 0.1 to 0.3 using Surv... Read More about The DESI One-percent Survey: Evidence for Assembly Bias from Low-redshift Counts-in-cylinders Measurements.

PROVABGS: The Probabilistic Stellar Mass Function of the BGS One-percent Survey (2024)
Journal Article
Hahn, C., Aguilar, J. N., Alam, S., Ahlen, S., Brooks, D., Cole, S., …Zou, H. (2024). PROVABGS: The Probabilistic Stellar Mass Function of the BGS One-percent Survey. Astrophysical Journal, 963(1), Article 56. https://doi.org/10.3847/1538-4357/ad19c8

We present the probabilistic stellar mass function (pSMF) of galaxies in the DESI Bright Galaxy Survey (BGS), observed during the One-percent Survey. The One-percent Survey was one of DESI’s survey validation programs conducted from 2021 April to May... Read More about PROVABGS: The Probabilistic Stellar Mass Function of the BGS One-percent Survey.

The DESI One-Percent Survey: A Concise Model for the Galactic Conformity of Emission-line Galaxies (2024)
Journal Article
Gao, H., Jing, Y. P., Xu, K., Zhao, D., Gui, S., Zheng, Y., …Zhou, Z. (2024). The DESI One-Percent Survey: A Concise Model for the Galactic Conformity of Emission-line Galaxies. Astrophysical Journal, 961(1), Article 74. https://doi.org/10.3847/1538-4357/ad09d6

Galactic conformity is the phenomenon whereby a galaxy of a certain physical property is correlated with its neighbors of the same property, implying a possible causal relationship. The observed auto correlations of emission-line galaxies (ELGs) from... Read More about The DESI One-Percent Survey: A Concise Model for the Galactic Conformity of Emission-line Galaxies.

DESI mock challenge: constructing DESI galaxy catalogues based on FastPM simulations (2023)
Journal Article
Variu, A., Alam, S., Zhao, C., Chuang, C., Yu, Y., Forero-Sánchez, D., …Zhou, Z. (2024). DESI mock challenge: constructing DESI galaxy catalogues based on FastPM simulations. Monthly Notices of the Royal Astronomical Society, 527(4), 11539-11558. https://doi.org/10.1093/mnras/stad3742

Together with larger spectroscopic surveys such as the Dark Energy Spectroscopic Instrument (DESI), the precision of large scale structure studies and thus the constraints on the cosmological parameters are rapidly improving. Therefore, one must buil... Read More about DESI mock challenge: constructing DESI galaxy catalogues based on FastPM simulations.

Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses (2023)
Journal Article
Nightingale, J. W., He, Q., Cao, X., Amvrosiadis, A., Etherington, A., Frenk, C. S., Hayes, R. G., Robertson, A., Cole, S., Lange, S., Li, R., & Massey, R. (2024). Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses. Monthly Notices of the Royal Astronomical Society, 527(4), 10480-10506. https://doi.org/10.1093/mnras/stad3694

The cold dark matter (DM) model predicts that every galaxy contains thousands of DM subhaloes; almost all other DM models include a physical process that smooths away the subhaloes. The subhaloes are invisible, but could be detected via strong gravit... Read More about Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses.

The two-point correlation function covariance with fewer mocks (2023)
Journal Article
Trusov, S., Zarrouk, P., Cole, S., Norberg, P., Zhao, C., Aguilar, J. N., …Zhou, Z. (2024). The two-point correlation function covariance with fewer mocks. Monthly Notices of the Royal Astronomical Society, 527(3), 9048-9060. https://doi.org/10.1093/mnras/stad3710

We present FITCOV an approach for accurate estimation of the covariance of two-point correlation functions that requires fewer mocks than the standard mock-based covariance. This can be achieved by dividing a set of mocks into jackknife regions and f... Read More about The two-point correlation function covariance with fewer mocks.

GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI (2023)
Journal Article
Allende Prieto, C., Aguado, D. S., González Hernández, J. I., Rebolo, R., Najita, J., Manser, C. J., …Zou, H. (2023). GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI. Astrophysical Journal, 957(2), Article 76. https://doi.org/10.3847/1538-4357/acfa96

The observations from the Dark Energy Spectroscopic Instrument (DESI) will significantly increase the numbers of known extremely metal-poor stars by a factor of ∼10, improving the sample statistics to study the early chemical evolution of the Milky W... Read More about GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI.

The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation (2023)
Journal Article
Hahn, C., Wilson, M. J., Ruiz-Macias, O., Cole, S., Weinberg, D. H., Moustakas, J., …Zou, H. (2023). The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation. Astronomical Journal, 165(6), Article 253. https://doi.org/10.3847/1538-3881/accff8

Over the next 5 yr, the Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on the 4 m Mayall Telescope at Kitt Peak National Observatory to conduct the first Stage IV dark energy galaxy survey. At z < 0.6, the DESI... Read More about The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation.