A MULTI-WAVELENGTH ANALYSIS OF SPITZER SELECTED COMA CLUSTER GALAXIES: STAR FORMATION RATES AND MASSES

被引：11

作者：

Edwards, Louise O. V. ^{[1
,2
]}

Fadda, Dario ^{[1
]}

机构：

[1] NASA Herschel Sci Ctr, Pasadena, CA 91125 USA

[2] Mt Allison Univ, Dept Phys, Sackville, NB E4L 1E6, Canada

来源：

ASTRONOMICAL JOURNAL | 2011年 / 142卷 / 05期

基金：

美国国家科学基金会;

关键词：

galaxies: clusters: individual (Coma Cluster); galaxies: fundamental parameters; galaxies: luminosity function; mass function; infrared: galaxies; COLOR-MAGNITUDE RELATION; ACTIVE GALACTIC NUCLEI; SPECTRAL ENERGY-DISTRIBUTIONS; LUMINOSITY FUNCTION; STARBURST GALAXIES; DWARF GALAXIES; GIANT GALAXIES; SOURCE IDENTIFICATION; SPECTROSCOPIC SURVEY; INFRARED GALAXIES;

D O I：

10.1088/0004-6256/142/5/148

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a thorough study of the specific star formation rates (sSFRs) for MIPS 24 mu m selected galaxies in the Coma cluster. We build galaxy spectral energy distributions using optical (u', g', r', i', z'), near-infrared (J, H, K-s), and mid- to far-infrared (Infrared Array Camera and MIPS) photometry. New and archival spectra confirm 210 cluster members. Subsequently, the total infrared luminosity, galaxy stellar mass, and sSFR for the members are determined by measuring best-fit templates. Using an array of complementary diagnostics, we search for any contaminating active galactic nuclei, but find few. We compare obscured SFRs to unobscured rates derived from extinction-corrected H alpha emission line measurements. The agreement between these two values leads us to conclude that there is no evidence for an additionally obscured component. In our spectroscopic sample, complete to 80% for r' < 19.5, we find that all starbursts are blue and are dwarfs, having masses < 10(9) M-circle dot. Examining the location of these starbursts within the cluster, we confirm that there is a lower fraction in the cluster core.

引用

页数：14

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