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

被引:15
作者
Berti, Angela M. [1 ]
Coil, Alison L. [1 ]
Hearin, Andrew P. [2 ]
Behroozi, Peter S. [3 ]
机构
[1] Univ Calif San Diego, Ctr Astrophys & Space Sci, Dept Phys, 9500 Gilman Dr, La Jolla, CA 92093 USA
[2] Argonne Natl Lab, High Energy Phys Div, Argonne, IL 60439 USA
[3] Univ Arizona, Dept Astron & Steward Observ, 933 N Cherry Ave, Tucson, AZ 85719 USA
基金
美国安德鲁·梅隆基金会; 美国国家科学基金会;
关键词
Galaxies; Clustering; Galaxy evolution; Large-scale structure of the universe; VLT DEEP SURVEY; ASSEMBLY BIAS; HALO MASS; LUMINOSITY DEPENDENCE; FORMATION HISTORY; REDSHIFT SURVEY; DARK SIDE; SPECTROGRAPH; CONSTRAINTS; MODEL;
D O I
10.3847/1538-3881/abcc6a
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
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页数:22
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