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Spitzer Observations of the Brightest Galaxies in X-Ray-Luminous Clusters

Egami, E. and Misselt, K. A. and Rieke, G. H. and Wise, M. W. and Neugebauer, G. and Kneib, J.-P. and Le Floc'h, E. and Smith, G. P. and Blaylock, M. and Dole, H. and Frayer, D. T. and Huang, J.-S. and Krause, O. and Papovich, C. and Pérez-González, P. G. and Rigby, J. R. (2006) Spitzer Observations of the Brightest Galaxies in X-Ray-Luminous Clusters. Astrophysical Journal, 647 (2). pp. 922-933. ISSN 0004-637X.

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We have studied the infrared properties of the brightest cluster galaxies (BCGs) located in the cores of X-ray-luminous clusters at 0.15 < z < 0.35. The majority of the BCGs are not particularly infrared-luminous compared with other massive early-type galaxies, suggesting that the cluster environment has little influence on the infrared luminosities of the BCGs. The exceptions, however, are the BCGs in the three X-ray-brightest clusters in the sample, A1835, Z3146, and A2390. These BCGs have a prominent far-infrared peak in their spectral energy distributions (SEDs), and two of them (those in A1835 and Z3146) can be classified as luminous infrared galaxies (LIRGs: L_(IR) > 10^(11) L☉). Although radio AGNs (active galactic nuclei) are found to be prevalent among the BCGs, the infrared luminosities of these three BCGs, judged from the infrared SED signatures, are likely to be powered by star formation. Considering the overall trend that clusters with shorter radiative gas cooling times harbor more infrared-luminous BCGs, the enhanced star formation may be caused by the cooling cluster gas accreting onto the BCGs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rieke, G. H.0000-0003-2303-6519
Kneib, J.-P.0000-0002-4616-4989
Smith, G. P.0000-0003-4494-8277
Frayer, D. T.0000-0003-1924-1122
Papovich, C.0000-0001-7503-8482
Pérez-González, P. G.0000-0003-4528-5639
Rigby, J. R.0000-0002-7627-6551
Additional Information:© 2006 American Astronomical Society. Received 2006 January 11; accepted 2006 March 15. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA (contract 1407). Support for this work was provided by NASA through an award issued by JPL/Caltech (contracts 960785 and 1255094). G. P. S. acknowledges financial support from Caltech and a Royal Society University Research Fellowship.
Funding AgencyGrant Number
Subject Keywords:cooling flows; galaxies: active; galaxies: clusters: general; galaxies: elliptical and lenticular, cD; infrared: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20110211-113113485
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Official Citation:E. Egami et al. 2006 ApJ 647 922 doi: 10.1086/504519
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22140
Deposited By: Jason Perez
Deposited On:14 Feb 2011 20:13
Last Modified:09 Mar 2020 13:19

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