Статья

GALAXY STELLAR MASS FUNCTIONS FROM ZFOURGE/CANDELS: AN EXCESS OF LOW-MASS GALAXIES SINCE<i>z</i>= 2 AND THE RAPID BUILDUP OF QUIESCENT GALAXIES

Adam R. TomczakGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; [email protected]Ryan F. QuadriCarnegie Observatories, Pasadena, CA 91101, USAKim-Vy H. TranGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; [email protected]Ivo LabbéSterrewacht Leiden, Leiden University, NL-2300 RA Leiden, The NetherlandsCaroline M. S. StraatmanSterrewacht Leiden, Leiden University, NL-2300 RA Leiden, The NetherlandsCasey PapovichGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; [email protected]Karl GlazebrookCentre for Astrophysics & Supercomputing, Swinburne University, Hawthorn, VIC 3122, AustraliaRebecca AllenAustralian Astronomical Observatories, P.O. Box 915, North Ryde, NSW 1670, AustraliaGabriel B. BrammerEuropean Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Vitacura, Santiago, ChileGlenn G. KacprzakCentre for Astrophysics & Supercomputing, Swinburne University, Hawthorn, VIC 3122, AustraliaLalitwadee KawinwanichakijGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; [email protected]Daniel D. KelsonCarnegie Observatories, Pasadena, CA 91101, USAPatrick J. McCarthyCarnegie Observatories, Pasadena, CA 91101, USANicola MehrtensGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; [email protected]Andrew J. MonsonCarnegie Observatories, Pasadena, CA 91101, USAS. Eric PerssonCarnegie Observatories, Pasadena, CA 91101, USALee R. SpitlerGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; [email protected]Vithal TilviGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; [email protected]Pieter van DokkumDepartment of Astronomy, Yale University, New Haven, CT 06520, USA

2014en

ABI

Аннотация

Using observations from the FourStar Galaxy Evolution Survey (ZFOURGE), we obtain the deepest measurements to date of the galaxy stellar mass function (SMF) at 0.2 < z < 3. ZFOURGE provides well-constrained photometric redshifts made possible through deep medium-bandwidth imaging at 1-2 μm. We combine this with Hubble Space Telescope imaging from the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey, allowing for the efficient selection of both blue and red galaxies down to stellar masses of ~109.5 M ☉ at z ~ 2.5. The total surveyed area is 316 arcmin2 distributed over three independent fields. We supplement these data with the wider and shallower NEWFIRM Medium-Band Survey to provide stronger constraints at high masses. Several studies at z ≤ 1.5 have revealed a steepening of the slope at the low-mass end of the SMF, leading to an upturn at masses <1010 M ☉ that is not well described by a standard single-Schechter function. We find evidence that this feature extends to at least z ~ 2 and that it can be found in both the star-forming and quiescent populations individually. The characteristic mass (M*) and slope at the lowest masses (α) of a double-Schechter function fit to the SMF stay roughly constant at Log(M/M ☉) ~ 10.65 and ~ - 1.5, respectively. The SMF of star-forming galaxies has evolved primarily in normalization, while the change in shape is relatively minor. Our data allow us, for the first time, to observe a rapid buildup at the low-mass end of the quiescent SMF. Since z = 2.5, the total stellar mass density of quiescent galaxies (down to 109 M ☉) has increased by a factor of ~12, whereas the mass density of star-forming galaxies only increases by a factor of ~2.2.

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Идентификаторы

DOI: 10.1088/0004-637x/783/2/85

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