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Oman, KA, Frenk, CS, Crain, RA, Lovell, MR and Pfeffer, J (2024) A warm dark matter cosmogony may yield more low-mass galaxy detections in 21-cm surveys than a cold dark matter one. Monthly Notices of the Royal Astronomical Society, 533 (1). pp. 67-78. ISSN 0035-8711
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A warm dark matter cosmogony may yield more low-mass galaxy detections in 21-cm surveys than a cold dark matter one.pdf - Published Version Available under License Creative Commons Attribution. Download (1MB) | Preview |
Abstract
The 21-cm spectral line widths, w50, of galaxies are an approximate tracer of their dynamical masses, such that the dark matter halo mass function is imprinted in the number density of galaxies as a function of w50. Correcting observed number counts for survey incompleteness at the level of accuracy needed to place competitive constraints on warm dark matter (WDM) cosmological models is very challenging, but forward-modelling the results of cosmological hydrodynamical galaxy formation simulations into observational data space is more straightforward. We take this approach to make predictions for an ALFALFA-like survey from simulations using the EAGLE galaxy formation model in both cold (CDM) and WDM cosmogonies. We find that for WDM cosmogonies more galaxies are detected at the low-w50 end of the 21-cm velocity width function than in the CDM cosmogony, contrary to what might naïvely be expected from the suppression of power on small scales in such models. This is because low-mass galaxies form later and retain more gas in WDM cosmogonies (with EAGLE). While some shortcomings in the treatment of cold gas in the EAGLE model preclude placing definitive constraints on WDM scenarios, our analysis illustrates that near-future simulations with more accurate modelling of cold gas will likely make strong constraints possible, especially in conjunction with new 21-cm surveys such as WALLABY.
| Item Type: | Article |
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| Uncontrolled Keywords: | galaxies: abundances; galaxies: luminosity function, mass function; dark matter; radio lines: galaxies; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 13 Nov 2024 11:59 |
| Last Modified: | 13 Nov 2024 12:00 |
| DOI or ID number: | 10.1093/mnras/stae1772 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24754 |
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