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

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dc.creatorDe Breuck, Carlos
dc.creatorBertoldi, Frank
dc.creatorCarilli, Chris
dc.creatorOmont, Alain
dc.creatorVenemans, Bram
dc.creatorRottgering, Huub
dc.creatorOverzier, Roderik
dc.creatorReuland, Michiel
dc.creatorMiley, George
dc.creatorIvison, Rob
dc.creatorvan Breugel, Wil
dc.date2004-05-18
dc.date.accessioned2026-07-07T02:13:14Z
dc.date.available2026-07-07T02:13:14Z
dc.descriptionWe 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 <S_{\rm 1.2mm}>=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.
dc.description13 Pages, including 9 PostScript figures. Accepted for publication in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/0405339
dc.identifierhttp://arxiv.org/abs/astro-ph/0405339
dc.identifierAstron.Astrophys. 424 (2004) 1-12
dc.identifierdoi:10.1051/0004-6361:20035885
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7742
dc.subjectAstrophysics
dc.titleA multi-wavelength study of the proto-cluster surrounding the z=4.1 radio galaxy TN J1338-1942
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