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Title: 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 » satellites and central galaxies as a function of their halo mass that can be used to calibrate hydrodynamical simulations and semi-analytic models.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3];  [4]
  1. Argonne National Laboratory, Argonne, IL 60439, USA
  2. Department of Physics, University of Arizona, 1118 E 4th St, Tucson, AZ 85721, USA
  3. Department of Astronomy and Astrophysics, and Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA
  4. 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}
}

Journal Article:
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https://doi.org/10.1093/mnras/stz2251

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THE SIZES OF z ∼ 6–8 LENSED GALAXIES FROM THE HUBBLE FRONTIER FIELDS ABELL 2744 DATA
journal, May 2015

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Modeling Galaxy‐Mass Correlations in Dissipationless Simulations
journal, October 2004

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Dark matter substructure in numerical simulations: a tale of discreteness noise, runaway instabilities, and artificial disruption
journal, January 2018

  • van den Bosch, Frank C.; Ogiya, Go
  • Monthly Notices of the Royal Astronomical Society, Vol. 475, Issue 3
  • DOI: 10.1093/mnras/sty084

Predicting galaxy star formation rates via the co-evolution of galaxies and haloes
journal, November 2014

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The Seventh Data Release of the Sloan Digital Sky Survey
text, January 2009

  • Abazajian, Kevork N.; Adelman-McCarthy, Jennifer K.; Agüeros, Marcel Andre
  • Columbia University
  • DOI: 10.7916/d8n879qg

Works referencing / citing this record:

Galaxy sizes and the galaxy–halo connection – I. The remarkable tightness of the size distributions
journal, December 2019

  • Zanisi, Lorenzo; Shankar, Francesco; Lapi, Andrea
  • Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 2
  • DOI: 10.1093/mnras/stz3516