Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933801r&link_type=abstract
American Astronomical Society, AAS Meeting #219, #338.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We present far-infrared (FIR) analysis of 70 Brightest Cluster Galaxies (BCGs) at 0.08 < z < 1.0. Deriving total infrared luminosity (LIR) directly from Spitzer/Herschel photometry spanning the peak of the dust component (24-500 μm), we calculate the obscured star formation rate (SFRFIR). 15/70 (22%) of the BCGs are detected in the FIR, with SFRFIR = 1-150 Msun/yr. SFRFIR is highly correlated with both the cluster X-ray cooling time and the occurrence of the cold gas tracing Halpha emission in the BCG. Only a modest reddening correction is required to account for Ha obscuration (<0.3 mag) in all but the most luminous (LIR > 2×1011 Lsun) BCGs. The LIRG-type BCGs require 1 mag of reddening and/or a correction for AGN contribution in the mid-infrared. We suggest that the link between BCG FIR and cluster cooling time is strong circumstantial evidence that SF is influenced, and plausibly fueled, by cluster-scale gas cooling. The dust properties of IR-bright BCGs are substantially similar to the general galaxy population, despite the different origin of the cold gas.
Edge Alastair
Egami Eiichi E.
Lensing Survey Herschel
LoCuSS
Rawle Tim
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