Beelen, A. and Omont, A. and Bavouzet, N. and Kovács, A. and Lagache, G. and De Breuck, C. and Weiss, A. and Menten, K. M. and Colbert, J. W. and Dole, H. and Siringo, G. and Kreysa, E. (2008) Submillimeter observations of the J2142-4423 Lyα protocluster at z = 2.38. Astronomy and Astrophysics, 485 (3). pp. 645-655. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:BEEaanda08
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Aims. We present observations aimed at exploring both the nature of Lyα emitting nebulae ("Lyα blobs") at z=2.38 and the way they trace large scale structure (LSS), by exploring their proximity to "maximum starbursts" through submillimeter emission. Our most important objectives are to make a census of associated submillimeter galaxies (SMGs), check their properties, and look for a possible overdensity in the protocluster J2142-4426 at z=2.38. Methods: We used the newly commissioned Large APEX Bolometer Camera (LABoCa) on the Atacama Pathfinder EXperiment (APEX) telescope, in its Science Verification phase, to carry out a deep 10' × 10' map at 870 μm}, and we performed multiple checks of the quality of data processing and source extraction. Results: Our map, the first published deep image, confirms the capabilities of APEX/LABoCa as the most efficient current equipment for wide and deep submm mapping. Twenty-two sources were securely extracted with 870 μm flux densities in the range 3-21 mJy, rms noise ~0.8-2.4 mJy, and far-IR luminosities probably in the range ~5-20 x 10^(12) L_⊙. Only one of the four 50 kpc-extended Lyα blobs has a secure 870 μm counterpart. The 870 μm source counts in the whole area are marginally higher than in the SHADES SCUBA survey, with a possible over-density around this blob. The majority of the 3.6-24 μm SEDs of the submillimeter sources indicate they are starburst dominated, with redshifts mostly ≳2. However, there is evidence of a high-z AGN in ~30% of the sources.
|Additional Information:||© ESO 2008. Received 2 February 2008 / Accepted 4 March 2008. We thank the referee for comments, which improved the manuscript. We thank F. Schuller for help during the development of the BoA software. A.B. thanks M. Douspis & M. Langer for their useful interactions during the writing of this paper. This work is based on observations made with the APEX Telescope and the Spitzer Space Telescope. APEX is a collaboration between the Max-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory. The Spitzer Space Telescope is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. We thank the APEX staff and astronomers for their support during the observations and the Bolometer Development Group at the MPIfR for providing the LABoCa bolometer array. Last, but not least, A.B. thanks the staff of Adobe and Cafe Export in San Pedro de Atacama.|
|Subject Keywords:||galaxies: starburst – galaxies: high-redshift – submillimeter – infrared: galaxies – ultraviolet: galaxies – large-scale structure of Universe.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||25 Jun 2009 18:55|
|Last Modified:||26 Dec 2012 10:55|
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