Evolution of Star-forming Galaxies from z = 0.7 to 1.2 with eBOSS Emission-line Galaxies

We study the evolution of star-forming galaxies with over the redshift range of 0.7 < z < 1.2 using the emission-line galaxies (ELGs) in the extended Baryon Oscillation Spectroscopic Survey (eBOSS). By applying the incomplete conditional stellar mass function (SMF) model proposed in Guo et al....

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Bibliographic Details
Published in:	The Astrophysical journal 2019-02, Vol.871 (2), p.147
Main Authors:	Guo, Hong, Yang, Xiaohu, Raichoor, Anand, Zheng, Zheng, Comparat, Johan, Gonzalez-Perez, V., Kneib, Jean-Paul, Schneider, Donald P., Bizyaev, Dmitry, Oravetz, Daniel, Oravetz, Audrey, Pan, Kaike
Format:	Article
Language:	eng
Subjects:	Astronomical models Astrophysics cosmology: observations cosmology: theory Emission analysis Emission lines Galactic evolution Galaxies galaxies: distances and redshifts galaxies: halos galaxies: statistics Halos large-scale structure of universe Red shift Satellite observation Sky surveys (astronomy) Star formation Stars & galaxies Stellar evolution Stellar mass Stellar models Stellar oscillations
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Summary:	We study the evolution of star-forming galaxies with over the redshift range of 0.7 < z < 1.2 using the emission-line galaxies (ELGs) in the extended Baryon Oscillation Spectroscopic Survey (eBOSS). By applying the incomplete conditional stellar mass function (SMF) model proposed in Guo et al., we simultaneously constrain the sample completeness, the stellar-halo mass relation (SHMR), and the quenched galaxy fraction. We obtain the intrinsic SMFs for star-forming galaxies in the redshift bins of 0.7 < z < 0.8, 0.8 < z < 0.9, 0.9 < z < 1.0, and 1.0 < z < 1.2, as well as the SMF for all galaxies in the redshift bin of 0.7 < z < 0.8. We find that the eBOSS ELG sample only selects about 1%-10% of the star-forming galaxy population at the different redshifts, with the lower redshift samples more complete. There is only weak evolution in the SHMR of the ELGs from z = 1.2 to z = 0.7, as well as the intrinsic galaxy SMFs. Our best-fitting models show that the central ELGs at these redshifts live in halos of mass M ∼ 1012 M , while the satellite ELGs occupy slightly more massive halos of M ∼ 1012.6 M . The average satellite fraction of the observed ELGs varies from 13% to 17%, with the galaxy bias increasing from 1.1 to 1.4 from z = 0.7 to 1.2.
ISSN:	0004-637X 1538-4357