A multi-wavelength study of the proto-cluster surrounding the z=4.1 radio galaxy TN J1338-1942 - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2004

A multi-wavelength study of the proto-cluster surrounding the z=4.1 radio galaxy TN J1338-1942

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1
Carlos de Breuck
  • Function : Author
Frank Bertoldi
Chris Carilli
Alain Omont
Bram Venemans
  • Function : Author
Huub Rottgering
  • Function : Author
Roderik Overzier
  • Function : Author
Michiel Reuland
  • Function : Author
George Miley
  • Function : Author
Rob Ivison
Wil van Breugel
  • Function : Author

Abstract

We present a 1.2 mm (250 GHz) map obtained with MAMBO on the IRAM 30m telescope of the central 25 arcmin^2 of the proto-cluster surrounding the z=4.1 radio galaxy TN J1338-1942. The map reaches a 1sigma sensitivity of 0.6 mJy in the central area, increasing to 1.2 mJy at the edges. We detect 10 candidate mm sources, of which 8 are also detected in a deep VLA 1.4 GHz map and/or a VLT R-band image. Three sources have a flux density S_{1.2 mm}>4.0 mJy, representing a 7sigma overdensity compared to random field surveys, which predict only 1 such source in our map area. We obtained SCUBA/JCMT 850 um and 450 um photometry of six radio/optically identified MAMBO sources, confirming 5 of them with S/N>4. Radio-to-mm and mm-to-submm redshift estimators cannot put strong constraints on the redshifts of these MAMBO sources, but 9 of them are consistent within the uncertainties (mean Delta z=+2.6) with z=4.1. One faint MAMBO source is possibly identified with an extremely red object (R-K=6.1) at a likely spectroscopic redshift z=1.18. The four brightest MAMBO sources are all located north of the radio galaxy, while the densest area of companion Ly-alpha excess and Lyman break galaxies is to the southeast. None of the 14 spectroscopically confirmed Ly-alpha emitters in the MAMBO field are detected at 1.2 mm; their average 1.2 mm flux density is =0.25+-0.24 mJy. If the mm sources lie at z=4.1, none of them show excess Ly-alpha emission in our narrow-band images. Both populations thus show no apparent overlap, possibly due to dust quenching the Ly-alpha emission. If the mm sources are part of the proto-cluster, our results suggest that galaxies with star formation rates of a few 1000 M_{Sun} yr^{-1} could be spread throughout the proto-cluster over projected scales of at least 2 Mpc.

Dates and versions

hal-00005395 , version 1 (15-06-2005)

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Carlos de Breuck, Frank Bertoldi, Chris Carilli, Alain Omont, Bram Venemans, et al.. A multi-wavelength study of the proto-cluster surrounding the z=4.1 radio galaxy TN J1338-1942. Astronomy and Astrophysics - A&A, 2004, 424, pp.1-12. ⟨hal-00005395⟩
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