Clustering constraints on the relative sizes of central and satellite galaxies
Abstract
In this work, we 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 ofmore »
- Authors:
-
- Argonne National Laboratory, Argonne, IL 60439, USA
- Department of Physics, University of Arizona, 1118 E 4th St, Tucson, AZ 85721, USA
- Department of Astronomy and Astrophysics, and Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA
- Universitäts-Sternwarte, Ludwig-Maximilians-Universität München, Scheinerstr. 1, D-81679 München, Germany, Max-Planck Institut für Astrophysik, Karl-Schwarzschild Straße 1, D-85748 Garching, Germany
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); German Research Foundation (DFG); USDOE Office of Science (SC), High Energy Physics (HEP); Kavli Foundation
- OSTI Identifier:
- 1560911
- Alternate Identifier(s):
- OSTI ID: 1576942
- Grant/Contract Number:
- AC02-06CH11357; NSF PHY11-25915; AST-1412107; PHY-1125897
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 489 Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: evolution; galaxies: fundamental parameters; galaxies: haloes; galaxies: statistics; large-scale structure of Universe
Citation Formats
Hearin, Andrew, Behroozi, Peter, Kravtsov, Andrey, and Moster, Benjamin. Clustering constraints on the relative sizes of central and satellite galaxies. United Kingdom: N. p., 2019.
Web. doi:10.1093/mnras/stz2251.
Hearin, Andrew, Behroozi, Peter, Kravtsov, Andrey, & Moster, Benjamin. Clustering constraints on the relative sizes of central and satellite galaxies. United Kingdom. https://doi.org/10.1093/mnras/stz2251
Hearin, Andrew, Behroozi, Peter, Kravtsov, Andrey, and Moster, Benjamin. Wed .
"Clustering constraints on the relative sizes of central and satellite galaxies". United Kingdom. https://doi.org/10.1093/mnras/stz2251.
@article{osti_1560911,
title = {Clustering constraints on the relative sizes of central and satellite galaxies},
author = {Hearin, Andrew and Behroozi, Peter and Kravtsov, Andrey and Moster, Benjamin},
abstractNote = {In this work, we 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.},
doi = {10.1093/mnras/stz2251},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 489,
place = {United Kingdom},
year = {2019},
month = {8}
}
https://doi.org/10.1093/mnras/stz2251
Web of Science
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The DEEP2 Galaxy Redshift Survey: Color and Luminosity Dependence of Galaxy Clustering at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $z\sim 1$ \end{document}
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Galaxy sizes and the galaxy–halo connection – I. The remarkable tightness of the size distributions
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