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Main-sequence Scatter is Real: The Joint Dependence of Galaxy Clustering on Star Formation and Stellar Mass

Journal Article · · The Astronomical Journal
 [1];  [1];  [2];  [3]
  1. Univ. of California, San Diego, CA (United States). Dept. of Physics, Center for Astrophysics and Space Sciences
  2. Argonne National Lab. (ANL), Argonne, IL (United States). High-Energy Physics Division
  3. Univ. of Arizona, Tucson, AZ (United States). Dept. of Astronomy and Steward Observatory
We present new measurements of the clustering of stellar-mass-complete samples of similar to 40,000 SDSS galaxies at z similar to 0.03 as a joint function of stellar mass and specific star formation rate (sSFR). Our results confirm what Coil et al. find at z similar to 0.7: galaxy clustering is a stronger function of sSFR at fixed stellar mass than of stellar mass at fixed sSFR. We also find that galaxies above the star-forming main sequence (SFMS) with higher sSFR are less clustered than galaxies below the SFMS with lower sSFR, at a given stellar mass. A similar trend is present for quiescent galaxies. This confirms that main-sequence scatter, and scatter within the quiescent sequence, is physically connected to the large-scale cosmic density field. We compare the resulting galaxy bias versus sSFR, and relative bias versus sSFR ratio, for different galaxy samples across 0 z < 1.2 to mock galaxy catalogs based on the empirical galaxy evolution model of Behroozi et al. This model fits PRIMUS and DEEP2 clustering data well at intermediate redshift, but agreement with SDSS is not as strong. We show that increasing the correlation between galaxy SFR and halo accretion rate at z similar to 0 in the model substantially improves agreement with SDSS data. Mock catalogs suggest that central galaxies contribute substantially to the dependence of clustering on sSFR at a given stellar mass and that the signal is not simply an effect of satellite galaxy fraction differences with sSFR. Our results are highly constraining for galaxy evolution models and show that the stellar-to-halo mass relation depends on sSFR.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1813122
Alternate ID(s):
OSTI ID: 23159083
Journal Information:
The Astronomical Journal, Journal Name: The Astronomical Journal Journal Issue: 1 Vol. 161; ISSN 0004-6256
Publisher:
IOP Publishing - AAASCopyright Statement
Country of Publication:
United States
Language:
English

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