A SCUBA galaxy in the protocluster around 53W002 at z=2.4

I Smail, R J Ivison, D G Gilbank, J S Dunlop, W C Keel, K Motohara, J A Stevens

Research output: Contribution to journalArticlepeer-review


We analyze an 850 mum Submillimetre Common-User Bolometer Array (SCUBA) map of the environment of the z = 2.39 radio galaxy 53W002, which has been shown to reside in an overdensity of Lyalpha-detected galaxies. We identify four luminous submillimeter sources within a 2.'3 (1.2 Mpc at z = 2.39) diameter area around the radio galaxy (which itself is a weak submillimeter source). We employ a 1.4 GHz map to accurately locate the counterpart of one of these sources, SMMJ17142+5016, and identify this source with a narrow-line active galactic nucleus with an extended Lyalpha halo at z = 2.390 that is a member of the structure around 53W002. Hence, SMM J17142+5016 is the first spectroscopically confirmed submillimeter-selected companion to a high-redshift radio galaxy. We discuss the OH-Airglow Suppression Spectrograph JHK spectrum of this galaxy and in addition present five new constraints on its spectral energy distribution longward of 1 mum, using these to estimate its bolometric luminosity as similar to8 x 10(12) L., or a star formation rate of similar to10(3) M. yr(-1) if young stars provide the bulk of the luminosity. This result provides direct support for the statistical detection of overdensities of SCUBA galaxies around high-redshift radio galaxies and confirms theoretical predictions that SCUBA galaxies, as the progenitors of massive elliptical galaxies, should be strongly clustered in the highest density regions of the distant universe.

Original languageEnglish
Pages (from-to)551-558
Number of pages8
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 1 Feb 2003


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