Rawle, T. D. and Edge, A. C. and Egami, E. and Rex, M. and Smith, G. P. and Altieri, B. and Fiedler, A. and Haines, C. P. and Pereira, M. J. and Pérez-González, P. G. and Portouw, J. and Valtchanov, I. and Walth, G. and van der Werf, P. P. and Zemcov, M. (2012) The Relation between Cool Cluster Cores and Herschel-detected Star Formation in Brightest Cluster Galaxies. Astrophysical Journal, 747 (1). Art. No. 29. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20120328-081918889
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Abstract
We present far-infrared (FIR) analysis of 68 brightest cluster galaxies (BCGs) at 0.08 < z < 1.0. Deriving total infrared luminosities directly from Spitzer and Herschel photometry spanning the peak of the dust component (24-500 μm), we calculate the obscured star formation rate (SFR).22^(+6.2)_(–5.3)% of the BCGs are detected in the far-infrared, with SFR = 1-150 M_☉ yr^(–1). The infrared luminosity is highly correlated with cluster X-ray gas cooling times for cool-core clusters (gas cooling time <1 Gyr), strongly suggesting that the star formation in these BCGs is influenced by the cluster-scale cooling process. The occurrence of the molecular gas tracing Hα emission is also correlated with obscured star formation. For all but the most luminous BCGs(L_(TIR) > 2 × 10^(11) L_☉), only a small (≾0.4 mag) reddening correction is required for SFR(Hα) to agree with SFR_(FIR). The relatively low Hα extinction (dust obscuration), compared to values reported for the general star-forming population, lends further weight to an alternate (external) origin for the cold gas. Finally, we use a stacking analysis of non-cool-core clusters to show that the majority of the fuel for star formation in the FIR-bright BCGs is unlikely to originate from normal stellar mass loss.
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| Additional Information: | © 2012 American Astronomical Society. Received 2011 November 18; accepted 2012 January 3; published 2012 February 10. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. This work is partially based on observations made with the Herschel Space Observatory, a European Space Agency Cornerstone Mission with significant participation by NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. We also thank the HSC and NHSC consortia for support with data reduction. This publication makes use of data products 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 the National Aeronautics and Space Administration and the National Science Foundation. G.P.S. acknowledges support from the Royal Society. | ||||||||||
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| Subject Keywords: | galaxies: clusters: general; galaxies: elliptical and lenticular, cD; galaxies: star formation; infrared: galaxies | ||||||||||
| Record Number: | CaltechAUTHORS:20120328-081918889 | ||||||||||
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:20120328-081918889 | ||||||||||
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| Official Citation: | The Relation between Cool Cluster Cores and Herschel-detected Star Formation in Brightest Cluster Galaxies T. D. Rawle et al. 2012 ApJ 747 29 | ||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||
| ID Code: | 29872 | ||||||||||
| Collection: | CaltechAUTHORS | ||||||||||
| Deposited By: | Ruth Sustaita | ||||||||||
| Deposited On: | 28 Mar 2012 15:54 | ||||||||||
| Last Modified: | 26 Dec 2012 14:59 |
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