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An excess of submm sources near 4C41.17: a candidate proto-cluster at z=3.8? | | Rob J. Ivison
; James S. Dunlop
; Ian Smail
; Arjun Dey
; Michael C. Liu
; James R. Graham
; | | Date: |
11 May 2000 | | Journal: | ApJ, 542, 27 (2000) | | Subject: | astro-ph | | Affiliation: | UCL), James S. Dunlop (Edinburgh), Ian Smail (Durham), Arjun Dey (NOAO), Michael C. Liu (Berkeley), James R. Graham (Berkeley | | Abstract: | Biased galaxy-formation theories predict that massive galaxies at high redshifts should act as signposts to high-density environments in the early Universe, which subsequently evolve into the cores of the richest clusters seen at the present day. These regions are characterised by over-densities of young galaxies, perhaps including a population of dusty, interaction-driven starbursts - the progenitors of massive cluster ellipticals. By searching for this population at submm wavelengths we can therefore test both galaxy- and structure-formation models. We have undertaken such a search in the field of a z=3.8 radio galaxy, 4C41.17, with the SCUBA submm camera. Our extremely deep 450- and 850-micron maps reveal an order-of-magnitude over-density of luminous submm galaxies compared to typical fields (the likelihood of finding such an over-density in a random field is <2E-3). The SCUBA galaxies have bolometric luminosities, >10^13 L(solar), which imply star-formation rates consistent with those required to form a massive galaxy in only a few 10^8 years. We also note that this field exhibits an over-density of extremely red objects (EROs), some of which may be associated with the submm sources, and Lyman-break galaxies. We propose that the over-densities of both submm and ERO sources in this field represent young dusty, starburst galaxies forming within a proto-cluster centered on the radio galaxy at z=3.8, which is also traced by a less-obscured population of Lyman-break galaxies. | | Source: | arXiv, astro-ph/0005234 | | Services: | Forum | Review | PDF | Favorites | |
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