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Title: The halo boundary of galaxy clusters in the SDSS

Analytical models and simulations predict a rapid decline in the halo density profile associated with the transition from the "infalling" regime outside the halo to the "collapsed" regime within the halo. Using data from SDSS, we explore evidence for such a feature in the density profiles of galaxy clusters using several different approaches. We first estimate the steepening of the outer galaxy density profile around clusters, finding evidence for truncation of the halo profile. Next, we measure the galaxy density profile around clusters using two sets of galaxies selected on color. We find evidence of an abrupt change in galaxy colors that coincides with the location of the steepening of the density profile. Since galaxies that have completed orbits within the cluster are more likely to be quenched of star formation and thus appear redder, this abrupt change in galaxy color can be associated with the transition from single-stream to multi-stream regimes. We also use a standard model comparison approach to measure evidence for a "splashback"-like feature, but find that this approach is very sensitive to modeling assumptions. Finally, we perform measurements using an independent cluster catalog to test for potential systematic errors associated with cluster selection. We identify severalmore » avenues for future work: improved understanding of the small-scale galaxy profile, lensing measurements, identification of proxies for the halo accretion rate, and other tests. As a result, with upcoming data from the DES, KiDS, and HSC surveys, we can expect significant improvements in the study of halo boundaries.« less
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [1] ;  [3] ;  [3] ; ORCiD logo [2] ; ORCiD logo [4] ;  [5] ; ORCiD logo [6] ; ORCiD logo [7]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. The Univ. of Chicago, Chicago, IL (United States)
  3. Univ. of Illinois at Urbana-Champaign, Champaign, IL (United States)
  4. The Univ. of Tokyo, Chiba (Japan)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Univ. of Pennsylvania, Philadelphia, PA (United States); The Abdus Salam International Center for Theoretical Physics, Trieste (Italy)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 841; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology: observations; galaxies: clusters: general
OSTI Identifier:
1369458

Baxter, Eric, Chang, Chihway, Jain, Bhuvnesh, Adhikari, Susmita, Dalal, Neal, Kravtsov, Andrey, More, Surhud, Rozo, Eduardo, Rykoff, Eli, and Sheth, Ravi K. The halo boundary of galaxy clusters in the SDSS. United States: N. p., Web. doi:10.3847/1538-4357/aa6ff0.
Baxter, Eric, Chang, Chihway, Jain, Bhuvnesh, Adhikari, Susmita, Dalal, Neal, Kravtsov, Andrey, More, Surhud, Rozo, Eduardo, Rykoff, Eli, & Sheth, Ravi K. The halo boundary of galaxy clusters in the SDSS. United States. doi:10.3847/1538-4357/aa6ff0.
Baxter, Eric, Chang, Chihway, Jain, Bhuvnesh, Adhikari, Susmita, Dalal, Neal, Kravtsov, Andrey, More, Surhud, Rozo, Eduardo, Rykoff, Eli, and Sheth, Ravi K. 2017. "The halo boundary of galaxy clusters in the SDSS". United States. doi:10.3847/1538-4357/aa6ff0. https://www.osti.gov/servlets/purl/1369458.
@article{osti_1369458,
title = {The halo boundary of galaxy clusters in the SDSS},
author = {Baxter, Eric and Chang, Chihway and Jain, Bhuvnesh and Adhikari, Susmita and Dalal, Neal and Kravtsov, Andrey and More, Surhud and Rozo, Eduardo and Rykoff, Eli and Sheth, Ravi K.},
abstractNote = {Analytical models and simulations predict a rapid decline in the halo density profile associated with the transition from the "infalling" regime outside the halo to the "collapsed" regime within the halo. Using data from SDSS, we explore evidence for such a feature in the density profiles of galaxy clusters using several different approaches. We first estimate the steepening of the outer galaxy density profile around clusters, finding evidence for truncation of the halo profile. Next, we measure the galaxy density profile around clusters using two sets of galaxies selected on color. We find evidence of an abrupt change in galaxy colors that coincides with the location of the steepening of the density profile. Since galaxies that have completed orbits within the cluster are more likely to be quenched of star formation and thus appear redder, this abrupt change in galaxy color can be associated with the transition from single-stream to multi-stream regimes. We also use a standard model comparison approach to measure evidence for a "splashback"-like feature, but find that this approach is very sensitive to modeling assumptions. Finally, we perform measurements using an independent cluster catalog to test for potential systematic errors associated with cluster selection. We identify several avenues for future work: improved understanding of the small-scale galaxy profile, lensing measurements, identification of proxies for the halo accretion rate, and other tests. As a result, with upcoming data from the DES, KiDS, and HSC surveys, we can expect significant improvements in the study of halo boundaries.},
doi = {10.3847/1538-4357/aa6ff0},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 841,
place = {United States},
year = {2017},
month = {5}
}