Herschel photometry of brightest cluster galaxies in cooling flow clusters
A. C. Edge, J. B. R. Oonk, R. Mittal, S. W. Allen, S. A. Baum, H., Boehringer, J. N. Bregman, M. N. Bremer, F. Combes, C. S. Crawford, M., Donahue, E. Egami, A. C. Fabian, G. J. Ferland, S. L. Hamer, N. A. Hatch, W., Jaffe, R. M. Johnstone, B. R. McNamara, C. P. O'Dea
TL;DR
This study uses Herschel photometry to reveal substantial cold dust in brightest cluster galaxies within cooling flow clusters, challenging previous assumptions about dust destruction and composition.
Contribution
It provides new Herschel PACS and SPIRE observations showing significant cold dust presence in BCGs, with detailed mass and temperature estimates.
Findings
Detection of >3 x 10^7 solar masses of cold dust
Dust temperatures between 20-28K
Dust mass correlates with cold gas traced by CO
Abstract
The dust destruction timescales in the cores of clusters of galaxies are relatively short given their high central gas densities. However, substantial mid-infrared and sub-mm emission has been detected in many brightest cluster galaxies. In this letter we present Herschel PACS and SPIRE photometry of the brightest cluster galaxy in three strong cooling flow clusters, A1068, A2597 and Zw3146. This photometry indicates that a substantial mass of cold dust is present (>3 x 10^7 Mo) at temperatures significantly lower (20-28K) than previously thought based on limited MIR and/or sub-mm results. The mass and temperature of the dust appear to match those of the cold gas traced by CO with a gas-to-dust ratio of 80-120.
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