On the galaxy–halo connection in the EAGLE simulation

Desmond, Harry; Mao, Yao -Yuan; Wechsler, Risa H.; Crain, Robert A.; Schaye, Joop

doi:10.1093/mnrasl/slx093

Title: On the galaxy–halo connection in the EAGLE simulation

Journal Article · Tue Jun 13 00:00:00 EDT 2017 · Monthly Notices of the Royal Astronomical Society: Letters

DOI:https://doi.org/10.1093/mnrasl/slx093· OSTI ID:1407427

^[1];

^[2]; Wechsler, Risa H. ^[1];

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^[4]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of Pittsburgh, Pittsburgh, PA (United States); Pittsburgh Particle Physics, Pittsburgh, PA (United States)
Liverpool John Moores Univ., Liverpool (United Kingdom)
Leiden Univ., Leiden (The Netherlands)

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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1407427

Alternate ID(s):: OSTI ID: 1418321

Journal Information:: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 471, Issue 1; ISSN 1745-3925

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Is the dark-matter halo spin a predictor of galaxy spin and size? Jiang, Fangzhou; Dekel, Avishai; Kneller, Omer Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 4 https://doi.org/10.1093/mnras/stz1952	journal	July 2019
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Galaxy sizes and the galaxy–halo connection – I. The remarkable tightness of the size distributions Zanisi, Lorenzo; Shankar, Francesco; Lapi, Andrea Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 2 https://doi.org/10.1093/mnras/stz3516	journal	December 2019
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Halo Histories vs. Galaxy Properties at z=0, III: The Properties of Star-Forming Galaxies Tinker, Jeremy L.; Hahn, ChangHoon; Mao, Yao-Yuan arXiv https://doi.org/10.48550/arxiv.1705.08458	text	January 2017
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Title: On the galaxy–halo connection in the EAGLE simulation

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