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We present far-infrared (FIR) analysis of 68 Brightest Cluster Galaxies(BCGs) at 0.08 < z < 1.0. Deriving total infrared luminosities directly fromSpitzer and Herschel photometry spanning the peak of the dust component(24-500um), 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. Theinfrared luminosity is highly correlated with cluster X-ray gas cooling timesfor cool-core clusters (gas cooling time <1 Gyr), strongly suggesting that thestar formation in these BCGs is influenced by the cluster-scale coolingprocess. The occurrence of the molecular gas tracing Ha emission is alsocorrelated with obscured star formation. For all but the most luminous BCGs(L_TIR > 2x10^11 L_sun), only a small (<0.4 mag) reddening correction isrequired for SFR(Ha) to agree with SFR_FIR. The relatively low Ha extinction(dust obscuration), compared to values reported for the general star-formingpopulation, lends further weight to an alternate (external) origin for the coldgas. Finally, we use a stacking analysis of non-cool-core clusters to show thatthe majority of the fuel for star formation in the FIR-bright BCGs is unlikelyto originate form normal stellar mass loss.

The Relation Between Cool Cluster Cores and Herschel-Detected Star Formation in Brightest Cluster Galaxies