2015ApJ...799..130R -
Astrophys. J., 799, 130 (2015/February-1)
The stellar-to-halo mass relation of local galaxies segregates by color.
RODRIGUEZ-PUEBLA A., AVILA-REESE V., YANG X., FOUCAUD S., DRORY N. and JING Y.P.
Abstract (from CDS):
By means of a statistical approach that combines different semi-empirical methods of galaxy-halo connection, we derive the stellar-to-halo mass relations (SHMR) of local blue and red central galaxies. We also constrain the fraction of halos hosting blue/red central galaxies and the occupation statistics of blue and red satellites as a function of halo mass, Mh. For the observational input we use the blue and red central/satellite galaxy stellar mass functions and two-point correlation functions in the stellar mass range of 9 < log(M*/M☉) <12. We find that: (1) the SHMR of central galaxies is segregated by color, with blue centrals having a SHMR above that of red centrals; at log(Mh/M☉) ∼12, the M*-to-Mh ratio of the blue centrals is ~0.05, which is ∼1.7 times larger than the value of red centrals. (2) The constrained scatters around the SHMRs of red and blue centrals are ~0.14 and ~0.11 dex, respectively. The scatter of the average SHMR of all central galaxies changes from ∼0.20 dex to ∼0.14 dex in the 11.3 < log(Mh/M☉) <15 range. (3) The fraction of halos hosting blue centrals at Mh = 1011 M☉ is 87%, but at 2x1012 M☉decays to ∼20%, approaching a few percent at higher masses. The characteristic mass at which this fraction is the same for blue and red galaxies is Mh ≈ 7 x 1011 M☉. Our results suggest that the SHMR of central galaxies at large masses is shaped by mass quenching. At low masses processes that delay star formation without invoking too strong supernova-driven outflows could explain the high M*-to-Mhratios of blue centrals as compared to those of the scarce red centrals.
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Journal keyword(s):
dark matter - galaxies: abundances - galaxies: evolution - galaxies: halos - galaxies: luminosity function, mass function - galaxies: statistics
Simbad objects:
2
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