Desmond, H, Mao, Y-Y, Wechsler, R, Crain, RA and Schaye, J (2017) On the galaxy-halo connection in the EAGLE simulation. Monthly Notices of the Royal Astronomical Society: Letters, 471 (1). ISSN 1745-3933

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Abstract

Empirical models of galaxy formation require assumptions about the correlations between galaxy and halo properties. These may be calibrated against observations or inferred from physical models such as hydrodynamical simulations. In this Letter, we use the EAGLE simulation to investigate the correlation of galaxy size with halo properties. We motivate this analysis by noting that the common assumption of angular momentum partition between baryons and dark matter in rotationally supported galaxies overpredicts both the spread in the stellar mass–size relation and the anticorrelation of size and velocity residuals, indicating a problem with the galaxy–halo connection it implies. We find the EAGLE galaxy population to perform significantly better on both statistics, and trace this success to the weakness of the correlations of galaxy size with halo mass, concentration and spin at fixed stellar mass. Using these correlations in empirical models will enable fine-grained aspects of galaxy scalings to be matched.

Item Type:	Article
Additional Information:	This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters following peer review. The version of record Mon Not R Astron Soc Lett (2017) 471 (1): L11-L15 is available online at: https://doi.org/10.1093/mnrasl/slx093
Uncontrolled Keywords:	0201 Astronomical And Space Sciences
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press (OUP)
Date Deposited:	25 Jul 2017 14:56
Last Modified:	21 Mar 2022 10:30
DOI or ID number:	10.1093/mnrasl/slx093
URI:	https://researchonline.ljmu.ac.uk/id/eprint/6851

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