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Title:
An Infrared Survey of Brightest Cluster Galaxies. I.
Authors:
Quillen, Alice C.; Zufelt, Nicholas; Park, Jaehong; O'Dea, Christopher P.; Baum, Stefi A.; Privon, George; Noel-Storr, Jacob; Edge, Alastair; Russell, Helen; Fabian, Andy; Donahue, Megan; Bregman, Joel N.; McNamara, Brian R.; Sarazin, Craig L.
Affiliation:
AA(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , ), AB(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , ), AC(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , ), AD(Department of Physics, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623-5603 , , , ), AE(Department of Physics, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623-5603 , , , ), AF(Department of Physics, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623-5603 , , , ), AG(Department of Physics, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623-5603 , , , ), AH(Institute for Computational Cosmology, Department of Physics, Durham University, Durham DH1 3LE; ), AI(Institute of Astronomy, Madingley Road, Cambridge, CB30HA, UK; ), AJ(Institute of Astronomy, Madingley Road, Cambridge, CB30HA, UK; ), AK(Physics and Astronomy Department, Michigan State University, East Lansing, MI 48824-2320 ), AL(Physics Department, University of Michigan, Ann Arbor, MI 48109; ), AM(Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1; ), AN(Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 )
Publication:
The Astrophysical Journal Supplement Series, Volume 176, Issue 1, pp. 39-58. (ApJS Homepage)
Publication Date:
05/2008
Origin:
UCP
ApJ Keywords:
Galaxies: Cooling Flows, Galaxies: Active, Galaxies: Clusters: General, Galaxies: Elliptical and Lenticular, cD, Infrared: Galaxies, Stars: Formation
DOI:
10.1086/525560
Bibliographic Code:
2008ApJS..176...39Q

Abstract

We report on an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies with optical line emission. These galaxies are located in the cores of X-ray luminous clusters selected from the ROSAT All-Sky Survey. We find that about half of these sources have a sign of excess infrared emission; 22 objects out of 62 are detected at 70 μm, 18 have 8/5.8 μm flux ratios above 1.0 and 28 have 24/8 μm flux ratios above 1.0. Altogether 35 of 62 objects in our survey exhibit at least one of these signs of infrared excess. Four galaxies with infrared excesses have a 4.5/3.6 μm flux ratio indicating the presence of hot dust, and/or an unresolved nucleus at 8 μm. Three of these have high measured [O III](5007 Å)/Hβ flux ratios suggesting that these four, Abell 1068, Abell 2146, Zwicky 2089, and R0821+07, host dusty active galactic nuclei (AGNs). Nine objects (including the four hosting dusty AGNs) have infrared luminosities greater than 1011 Lsolar and so can be classified as luminous infrared galaxies (LIRGs). Excluding the four systems hosting dusty AGNs, the excess mid-infrared emission in the remaining brightest cluster galaxies is likely related to star formation.

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