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Herschel-Astrophysical Terahertz Large Area Survey : detection of a far-infrared population around galaxy clusters.

Coppin, K.E.K. and Geach, J.E. and Smail, I. and Dunne, L. and Edge, A.C. and Ivison, R.J. and Maddox, S. and Auld, R. and Baes, M. and Buttiglione, S. and Cava, A. and Clements, D.L. and Cooray, A. and Dariush, A. and de Zotti, G. and Dye, S. and Eales, S. and Fritz, J. and Hopwood, R. and Ibar, E. and Jarvis, M. and Michałowski, M.J. and Murphy, D.N.A. and Negrello, M. and Pascale, E. and Pohlen, M. and Rigby, E. and Rodighiero, G. and Scott, D. and Serjeant, S. and Smith, D.J.B. and Temi, P. and van der Werf, P. (2011) 'Herschel-Astrophysical Terahertz Large Area Survey : detection of a far-infrared population around galaxy clusters.', Monthly notices of the Royal Astronomical Society., 416 (1). pp. 680-688.


We report the detection of a significant excess in the surface density of far-infrared sources from the Herschel-Astrophysical Terahertz Large Area Survey within ∼1 Mpc of the centres of 66 optically selected clusters of galaxies in the Sloan Digital Sky Survey with 〈z〉∼ 0.25. From the analysis of the multiwavelength properties of their counterparts we conclude that the far-infrared emission is associated with dust-obscured star formation and/or active galactic nuclei (AGN) within galaxies in the clusters themselves. The excess reaches a maximum at a radius of ∼0.8 Mpc, where we find 1.0 ± 0.3 S250 > 34 mJy sources on average per cluster above what would be expected for random field locations. If the far-infrared emission is dominated by star formation (as opposed to AGN) then this corresponds to an average star formation rate of ∼7 M⊙ yr−1 per cluster in sources with LIR > 5 × 1010 L⊙. Although lensed sources make a negligible contribution to the excess signal, a fraction of the sources around the clusters could be gravitationally lensed, and we have identified a sample of potential cases of cluster-lensed Herschel sources that could be targeted in follow-up studies.

Item Type:Article
Keywords:Gravitational lensing, Galaxies, Clusters, Starburst.
Full text:(NA) Not Applicable
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Date accepted:No date available
Date deposited:No date available
Date of first online publication:September 2011
Date first made open access:No date available

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