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.
@article{arxiv.1005.1211,
title = {Herschel photometry of brightest cluster galaxies in cooling flow clusters},
author = {A. C. Edge and J. B. R. Oonk and R. Mittal and S. W. Allen and S. A. Baum and H. Boehringer and J. N. Bregman and M. N. Bremer and F. Combes and C. S. Crawford and M. Donahue and E. Egami and A. C. Fabian and G. J. Ferland and S. L. Hamer and N. A. Hatch and W. Jaffe and R. M. Johnstone and B. R. McNamara and C. P. O'Dea and P. Popesso and A. C. Quillen and P. Salome and C. L. Sarazin and G. M. Voit and R. J. Wilman and M. W. Wise},
journal= {arXiv preprint arXiv:1005.1211},
year = {2015}
}
Comments
Accepted for A&A Herschel Special Issue, 7 pages, 3 figures