A multi-wavelength analysis of Spitzer selected Coma Cluster galaxies: star formation rates and masses

Abstract

We present a thorough study of the specific star formation rates for MIPS 24um selected galaxies in the Coma cluster. We build galaxy spectral energy distributions using optical (u',g',r',i',z'), Near-infrared (J,H,Ks), and Mid to Far-infrared (IRAC and MIPS) photometry. New and archival spectra confirm 210 cluster members. Subsequently, the total infrared luminosity, galaxy stellar mass, and specific star formation rate for the members are determined by measuring best fit templates. Using an array of complementary diagnostics, we search for contaminating AGN, but find few. We compare obscured star formation rates 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 solar masses. Examining the location of these starbursts within the cluster, we confirm that there is a lower fraction in the cluster core.

30pages, 16 figures, accepted to AJ

References in corpus (14)

• Spitzer's Contribution to the AGN Population
• Starburst galaxies in cluster-feeding filaments unveiled by Spitzer
• A spectroscopic survey of dwarf galaxies in the Coma Cluster: Stellar populations, environment and downsizing
• The Spitzer Space Telescope Extra-Galactic First Look Survey: 24 micron data reduction, catalog, and source identification
• WINGS: a WIde-field nearby Galaxy-cluster survey III. Deep near-infrared photometry of 28 nearby clusters
• The mid-infrared colour-magnitude relation of early-type galaxies in the Coma cluster as measured by Spitzer-IRS
• On the Dynamical Origin of the ICM Metallicity Evolution
• Deep Herschel view of obscured star formation in the Bullet cluster
• Uncovering the Near-IR Dwarf Galaxy Population of the Coma Cluster with Spitzer IRAC
• The Mid-Infrared Spectral Energy Distribution, Surface Brightness and Color Profiles in Elliptical Galaxies
• The Radio Luminosity Function and Galaxy Evolution in the Coma Cluster
• The evolution of dwarf galaxies in the Coma supercluster
• Spitzer observations of Abell 1763 - I: infrared and optical photometry
• Orientations of very faint galaxies in the Coma cluster

Cited by in corpus (8)

• H I content in Coma cluster substructure
• The HST/ACS Coma Cluster Survey - VII. Structure and Assembly of Massive Galaxies in the Center of the Coma Cluster
• The Herschel Fornax Cluster Survey II: FIR properties of optically-selected Fornax cluster galaxies
• Star Formation in High-Redshift Cluster Ellipticals
• Deriving galaxy cluster velocity anisotropy profiles from a joint analysis of dynamical and weak lensing data
• H-ATLAS: The Far-Infrared properties of galaxies in and around the Coma Cluster
• Mid-IR Enhanced Galaxies in the Coma & Virgo Cluster: lenticulars with a high star formation rate
• A Redshift Survey of the Coma Cluster (A1656): Understanding the Nature of Subhalos in the Weak-lensing Map