期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 416, 期 1, 页码 680-688出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.19084.x
关键词
gravitational lensing: strong; galaxies: clusters: general; galaxies: evolution; galaxies: starburst; submillimetre: galaxies
资金
- endowment of the Lorne Trottier Chair in Astrophysics and Cosmology at McGill
- National Science and Engineering Research Council of Canada
- UK Science and Technology Facilities Council (STFC)
- Centre of Research in Astrophysics of Quebec
- ASI-INAF [I/009/10/0]
- STFC [ST/H001530/1, ST/F008694/1, PP/D000963/1, ST/H004548/1, ST/I001212/1, ST/I005765/1, ST/G002630/1, ST/I001573/1, ST/G002533/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001212/1, ST/G002533/1, ST/F008694/1, PP/D000963/1, ST/I005765/1, ST/H004548/1, ST/G002630/1, ST/I001573/1] Funding Source: researchfish
- UK Space Agency [ST/G003874/1] Funding Source: researchfish
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 similar to 1Mpc of the centres of 66 optically selected clusters of galaxies in the Sloan Digital Sky Survey with < z > similar to 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 similar to 0.8Mpc, where we find 1.0 +/- 0.3 S-250 > 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 similar to 7M(circle dot) yr(-1) per cluster in sources with L-IR > 5 x 10(10) L-circle dot. 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.
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