Clustering constraints on the relative sizes of central and satellite galaxies
AffiliationUniv Arizona, Dept Phys
galaxies: fundamental parameters
large-scale structure of Universe
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationAndrew Hearin, Peter Behroozi, Andrey Kravtsov, Benjamin Moster, Clustering constraints on the relative sizes of central and satellite galaxies, Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 2, October 2019, Pages 1805–1819, https://doi.org/10.1093/mnras/stz2251
RightsCopyright © 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractWe empirically constrain how galaxy size relates to halo virial radius using new measurements of the size- and stellar mass-dependent clustering of galaxies in the Sloan Digital Sky Survey. We find that small galaxies cluster much more strongly than large galaxies of the same stellar mass. The magnitude of this clustering difference increases on small scales, and decreases with increasing stellar mass. Using forward-modelling techniques implemented in Halotools, we test an empirical model in which present-day galaxy size is proportional to the size of the virial radius at the time the halo reached its maximum mass. This simple model reproduces the observed size dependence of galaxy clustering in striking detail. The success of this model provides strong support for the conclusion that satellite galaxies have smaller sizes relative to central galaxies of the same halo mass. Our findings indicate that satellite size is set prior to the time of infall, and that a remarkably simple, linear size–virial radius relation emerges from the complex physics regulating galaxy size. We make quantitative predictions for future measurements of galaxy–galaxy lensing, including dependence upon size, scale, and stellar mass, and provide a scaling relation of the ratio of mean sizes of satellites and central galaxies as a function of their halo mass that can be used to calibrate hydrodynamical simulations and semi-analytic models.
VersionFinal published version
SponsorsUnited States Department of Energy (DOE) [DE-AC02-06CH11357]; National Science Foundation (NSF) [NSF PHY11-25915]; National Science Foundation (NSF) [PHY17-48958, AST-1412107]; Kavli Institute for Cosmological Physics at the University of Chicago [PHY-1125897]; Kavli Foundation; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) German Research Foundation (DFG) [MO 2979/1-1]
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