A submillimetre-bright z~3 overdensity behind a z~1 supercluster revealed by SCUBA-2 and Herschel

Autor: Noble, A. G., Geach, J. E., van Engelen, A. J., Webb, T. M. A., Coppin, K. E. K., Delahaye, A., Gilbank, D. G., Gladders, M. D., Ivison, R. J., Omori, Y., Yee, H. K. C.
Rok vydání: 2013
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1093/mnrasl/slt108
Popis: We present a wide-field (30' diameter) 850um SCUBA-2 map of the spectacular three-component merging supercluster, RCS 231953+00, at z=0.9. The brightest submillimetre galaxy (SMG) in the field (S_850=12mJy) is within 30" of one of the cluster cores (RCS 2319-C), and is likely to be a more distant, lensed galaxy. Interestingly, the wider field around RCS 2319-C reveals a local overdensity of SMGs, exceeding the average source density by a factor of 4.5, with a <1 per cent chance of being found in a random field. Utilizing Herschel-SPIRE observations, we find three of these SMGs have similar submillimetre colours. We fit their observed 250-850um spectral energy distributions to estimate their redshift, yielding 2.5Comment: 6 pages, 4 colour figures; accepted for publication in MNRAS Letters
Databáze: arXiv