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Title: Beyond halo mass: galactic conformity as a smoking gun of central galaxy assembly bias

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States); Yale Univ., New Haven, CT (United States)
  2. Univ. of Chicago, IL (United States)
  3. Yale Univ., New Haven, CT (United States)

Quenched central galaxies tend to reside in a preferentially quenched large-scale environment, a phenomenon that has been dubbed galactic conformity. Remarkably, this tendency persists out to scales far larger than the virial radius of the halo hosting the central. Therefore, conformity manifestly violates the widely adopted assumption that the dark matter halo mass $$M_{\text{vir}}$$ exclusively governs galaxy occupation statistics. This paper is the first in a series studying the implications of the observed conformity signal for the galaxy–dark matter connection. Here, we show that recent measurements of conformity on scales $$\textit{r}$$ ~ 1–5 Mpc imply that central galaxy quenching statistics cannot be correctly predicted with the knowledge of $$M_{\text{vir}}$$ alone. We also demonstrate that ejected (or ‘backsplash’) satellites cannot give rise to the signal. We then invoke the age matching model, which is predicated on the co-evolution of galaxies and haloes. We find that this model produces a strong signal, and that central galaxies are solely responsible. We conclude that large-scale ‘two-halo’ conformity represents a smoking gun of central galaxy assembly bias, and indicates that contemporary models of satellite quenching have systematically overestimated the influence of post-infall processes.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Grant/Contract Number:
AC02-07CH11359; AST-1202698
OSTI ID:
1156509
Report Number(s):
FERMILAB-PUB-14-169-A; arXiv:1404.6524; oai:inspirehep.net:1292740
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 452, Issue 2; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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On the Prospect of Using the Maximum Circular Velocity of Halos to Encapsulate Assembly Bias in the Galaxy–Halo Connection journal December 2019
The Dependence of Galaxy Clustering on Stellar-mass Assembly History for LRGs journal October 2017
Mapping stellar content to dark matter haloes using galaxy clustering and galaxy–galaxy lensing in the SDSS DR7 journal October 2015
Mapping stellar content to dark matter haloes using galaxy clustering and galaxy–galaxy lensing in the SDSS DR7 text January 2015
Cosmic Web of Galaxies in the COSMOS Field: Public Catalog and Different Quenching for Centrals and Satellites text January 2016
Galaxy and Mass Assembly (GAMA): halo formation times and halo assembly bias on the cosmic web text January 2016
Mapping stellar content to dark matter halos - III.Environmental dependence and conformity of galaxy colours text January 2017
Halo Histories vs. Galaxy Properties at z=0, III: The Properties of Star-Forming Galaxies text January 2017
The Impact of Assembly Bias on the Galaxy Content of Dark Matter Halos text January 2017
Disruption of Dark Matter Substructure: Fact or Fiction? text January 2017
Halo models of HI selected galaxies text January 2017
The dependence of galaxy clustering on tidal environment in the Sloan Digital Sky Survey text January 2018
The impact of assembly bias on the halo occupation in hydrodynamical simulations text January 2018
The Evolution of Assembly Bias text January 2018
The Secondary Spin Bias of Dark Matter Haloes text January 2018
Global analysis of luminosity- and colour-dependent galaxy clustering in the Sloan Digital Sky Survey text January 2019
Revealing the galaxy-halo connection in IllustrisTNG text January 2019
AGN-driven quenching of satellite galaxies text January 2019
On the prospect of using the maximum circular velocity of halos to encapsulate assembly bias in the galaxy-halo connection text January 2019