Molecular gas mass functions of normal star-forming galaxies since z ∼ 3

被引：31

作者：

Berta, S. ^{[1
]}

Lutz, D. ^{[1
]}

Nordon, R. ^{[2
]}

Genzel, R. ^{[1
]}

Magnelli, B. ^{[3
]}

Popesso, P. ^{[1
]}

Rosario, D. ^{[1
]}

Saintonge, A. ^{[1
]}

Wuyts, S. ^{[1
]}

Tacconi, L. J. ^{[1
]}

机构：

[1] Max Planck Inst Extraterr Phys MPE, D-85741 Garching, Germany

[2] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[3] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2013年 / 555卷

关键词：

galaxies: luminosity function; mass function; galaxies: statistics; galaxies: evolution; galaxies: star formation; infrared: galaxies; SPECTRAL ENERGY-DISTRIBUTIONS; H-2/H I RATIO; LUMINOSITY FUNCTIONS; SCALING RELATIONS; COSMIC EVOLUTION; MAIN-SEQUENCE; STELLAR; FIELD; PACS; REDSHIFT;

D O I：

10.1051/0004-6361/201321776

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We used deep far-infrared data from the PEP/GOODS-Herschel surveys and restframe ultraviolet photometry to study the evolution of the molecular gas mass function of normal star-forming galaxies. Computing the molecular gas mass, M-mol, by scaling star formation rates through depletion timescales, or combining infrared (IR) luminosity and obscuration properties as described in the literature, we obtained M-mol for roughly 700, z = 0.2-3.0 galaxies near the star-forming main sequence. The number density of galaxies follows a Schechter function of M-mol. The characteristic mass M* is found to strongly evolve up to z similar to 1 and then flatten at earlier epochs, resembling the IR luminosity evolution of similar objects. At z similar to 1, our result is supported by an estimate based on the stellar mass function of star-forming galaxies and gas fraction scalings from the PHIBSS survey. We compared our measurements with results from current models, finding better agreement with those that are treating star formation laws directly rather than in post-processing. Integrating the mass function, we studied the evolution of the M-mol density and its density parameter Omega(mol).

引用

页数：5

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