Herschel-ATLAS: detection of a far-infrared population around galaxy clusters

Details Herschel-ATLAS: detection of a far-infrared population around galaxy clusters Herschel-ATLAS: detection of a far-infrared population around galaxy clusters

2011-05-16

arxiv.org/abs/1105.3199v1

MNRAS 416 (2011) 680-688

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 5 figures, 1 table; accepted for publication in MNRAS

Scientific paper

We report the detection of a significant excess in the surface density of far-infrared sources from the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) within ~1 Mpc of the centres of 66 optically-selected clusters of galaxies in the SDSS with ~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 within galaxies in the clusters themselves. The excess reaches a maximum at a radius of ~0.8 Mpc, where we find 1.0\pm0.3 S_250um>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_sun/yr per cluster in sources with L_IR>5d10 L_sun. 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.

Affiliated with

Also associated with

No associations

Rating

Herschel-ATLAS: detection of a far-infrared population around galaxy clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Herschel-ATLAS: detection of a far-infrared population around galaxy clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Herschel-ATLAS: detection of a far-infrared population around galaxy clusters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-727441