The formation of cluster elliptical galaxies as revealed by extensive star formation

Abstract

The most massive galaxies in the present-day Universe are found to lie in the centres of rich clusters. They have old, coeval stellar populations suggesting that the bulk of their stars must have formed at early epochs in spectacular starbursts - luminous phenomena at submillimetre wavelengths. The most popular model of galaxy formation predicts that these galaxies form in proto-clusters at high-density peaks in the early Universe. Such peaks are signposted by massive high-redshift radio galaxies. Here we report deep submillimetre mapping of seven high-redshift radio galaxies and their environments. These data confirm not only the presence of spatially extended massive star-formation activity in the radio galaxies themselves, but also in companion objects previously undetected at any wavelength. The prevalence, orientation, and inferred masses of these submillimetre companion galaxies suggest that we are witnessing the synchronous formation of the most luminous elliptical galaxies found today at the centres of rich galaxy clusters.

13 pages, 4 figures (1 colour, resolution degraded - gzipped high res version available at http://www.roe.ac.uk/~rji/figure1.ps.gz)

References in corpus (11)

• Gasdynamics and Starbursts in Major Mergers
• SCUBA: A common-user submillimetre camera operating on the James Clerk Maxwell Telescope
• Quasars, their host galaxies, and their central black holes
• The nature of faint submm-selected galaxies
• The Homogeneity of Spheroidal Populations in Distant Clusters
• The Ages of Elliptical Galaxies in a Merger Model
• Molecular gas and dust around a radio-quiet quasar at redshift 4.7
• A submillimetre survey of the star-formation history of radio galaxies
• High-redshift radio galaxies and quasars at sub-millimetre wavelengths: assessing their evolutionary status
• Damped Lyman alpha systems and disk galaxies: number density, column density distribution and gas density
• An Obscured Radio Galaxy at High Redshift

Cited by in corpus (1)

• The Radio Galaxy Environment Reference Survey (RAGERS): a submillimetre study of the environments of massive radio-quiet galaxies at $z=1-3$