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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2008

Submillimeter observations of the J2142-4423 Lyα protocluster at z = 2.38

A. Beelen
N. Bavouzet
  • Fonction : Auteur
A. Kovács
  • Fonction : Auteur
G. Lagache
C. de Breuck
  • Fonction : Auteur
A. Weiss
  • Fonction : Auteur
K. M. Menten
  • Fonction : Auteur
J. W. Colbert
  • Fonction : Auteur
H. Dole
  • Fonction : Auteur
G. Siringo
  • Fonction : Auteur
E. Kreysa
  • Fonction : Auteur

Résumé

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 arcmin × 10 arcmin map at 870 μ m}, 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 {μ m} 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× 1012 L_⊙. Only one of the four 50 kpc-extended Lyα blobs has a secure 870 {μ m} counterpart. The 870 {μ m} 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 {μ m}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.

This work is based on observations made with the APEX Telescope. APEX is a collaboration between the Max-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory.

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Dates et versions

hal-03646431 , version 1 (03-05-2022)

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A. Beelen, A. Omont, N. Bavouzet, A. Kovács, G. Lagache, et al.. Submillimeter observations of the J2142-4423 Lyα protocluster at z = 2.38. Astronomy and Astrophysics - A&A, 2008, 485, pp.645-655. ⟨10.1051/0004-6361:200809500⟩. ⟨hal-03646431⟩
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