Edwards, Louise O. V. and Fadda, Dario (2011) A Multi-wavelength Analysis of Spitzer Selected Coma Cluster Galaxies: Star Formation Rates and Masses. Astronomical Journal, 142 (5). p. 148. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20111205-113449250
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We present a thorough study of the specific star formation rates (sSFRs) for MIPS 24 μm 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 Hα 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_☉. Examining the location of these starbursts within the cluster, we confirm that there is a lower fraction in the cluster core.
|Additional Information:||© 2011 American Astronomical Society. Received 2011 May 12; accepted 2011 August 24; published 2011 September 28. Support for this work was provided by NASA through an award issued by JPL/Caltech. This work is based in part on observations made with Spitzer, a space telescope operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, then Participating Institutions, the National Science Foundation, the US Department of Energy, NASA, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council of England. The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions (see list at http://www.sdss.org/collaboration/credits.html). This publication makes use of data from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the National Science Foundation. The NASA Extragalactic Database (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Facilities: Spitzer (MIPS, IRAC), Hale (WIRC), WIYN (Hydra)|
|Subject Keywords:||galaxies: clusters: individual (Coma Cluster); galaxies: fundamental parameters; galaxies: luminosity function, mass function; infrared: galaxies|
|Official Citation:||A Multi-wavelength Analysis of Spitzer Selected Coma Cluster Galaxies: Star Formation Rates and Masses Louise O. V. Edwards and Dario Fadda 2011 The Astronomical Journal 142 148|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||08 Dec 2011 18:44|
|Last Modified:||26 Dec 2012 14:34|
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