Cluster Environments in the Early Universe:. Probing Obscured Proto-Ellipticals with SCUBA

Details Cluster Environments in the Early Universe:. Probing Obscured Proto-Ellipticals with SCUBA Cluster Environments in the Early Universe:. Probing Obscured Proto-Ellipticals with SCUBA

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dms..conf..135i&link_type=abstract

DEEP MILLIMETER SURVEYS Implications for Galaxy Formation and Evolution. Held 19-21 June 2000 in University of Massachusetts, Am

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe a survey of high-redshift radio galaxies and quasars, 12 of which have so far been mapped to robust 850-μm detection limits of 5 mJy. Our aim is to test the proposal that these AGN act as signposts to high-density environments in the early Universe, regions that may subsequently evolve into the richest present-day clusters. By searching these fields for dusty starbursts -- the progenitors of cluster ellipticals -- we can constrain both galaxy- and structure-formation models. Our SCUBA maps reveal an over-density of luminous submm galaxies in the vicinity of high redshift AGN. These sources are often associated with extremely red objects (EROs; I - K > 5); the detection of multiple components close to the central AGN, often blended, is also a common theme. These maps thus provide a unique graphical demonstration of the formation of massive galaxies in the early Universe -- a process obscured from view to all but SCUBA. We introduce a classification scheme for the counterparts to submm galaxies, based on the results of follow-up observations. Finally, we propose that the over-densities of both submm and ERO sources in these fields represent young dusty, starburst galaxies forming within proto-clusters centred on the massive AGN hosts, regions that are sometimes also traced by a less-obscured population of Lyman-break galaxies.

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