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Date and Time of the Query: 2019-04-24 T09:26:19 PDT
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For refcode 2012ApJ...747...29R:
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Copyright by American Astronomical Society. Reproduced by permission
2012ApJ...747...29R The Relation between Cool Cluster Cores and Herschel-detected Star Formation in Brightest Cluster Galaxies Rawle, T. D.; Edge, A. C.; Egami, E.; Rex, M.; Smith, G. P.; Altieri, B.; Fiedler, A.; Haines, C. P.; Pereira, M. J.; Perez-Gonzalez, P. G.; Portouw, J.; Valtchanov, I.; Walth, G.; van der Werf, P. P.; Zemcov, M. 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 micron), 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_sun_ 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 H{alpha} emission is also correlated with obscured star formation. For all but the most luminous BCGs (L_TIR_ > 2 x 10^11^ L_sun_), only a small (<~0.4 mag) reddening correction is required for SFR(H{alpha}) to agree with SFR_FIR_. The relatively low H{alpha} 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. Key words: galaxies: clusters: general, galaxies: elliptical and lenticular, cD, galaxies: star formation, infrared: galaxies
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