Improving the identification of high-z Herschel sources with position priors and optical/NIR and FIR/mm photometric redshifts

P. G. Pérez-González (1) , E. Egami (2) , M. Rex (3) , T. D. Rawle (2) , J.-P. Kneib (4) , J. Richard (5) , D. Johansson (6) , B. Altieri (7) , A. W. Blain (8) , J. J. Bock (6) , F. Boone (9) , C. R. Bridge (8) , S. M. Chung (6) , B. Clément (4) , D. Clowe (6) , F. Combes (10) , J.-G. Cuby (4) , M. Dessauges-Zavadsky (11) , C. D. Dowell (6) , N. Espino-Briones (6) , D. Fadda (6) , A. K. Fiedler (6) , A. Gonzalez (12) , C. Horellou (6) , O. Ilbert (4) , R. J. Ivison (13) , M. Jauzac (4) , D. Lutz (14) , R. Pelló (9) , M. J. Pereira (2) , G. H. Rieke (2) , G. Rodighiero (6) , D. Schaerer (9) , G. P. Smith (15) , I. Valtchanov (6) , G. L. Walth (2) , P. van Der Werf (16) , M. W. Werner (6) , M. Zemcov (6)

1 Departamento de Física y Astronomía
2 Steward Observatory
3 AWI - Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine
4 LAM - Laboratoire d'Astrophysique de Marseille
5 CRAL - Centre de Recherche Astrophysique de Lyon
6 AUTRES
7 XMM-Newton Science Operations Centre
8 Department of Astronomy
9 IRAP - Institut de recherche en astrophysique et planétologie
10 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
11 ObsGE - Observatoire Astronomique de l'Université de Genève
12 UF|Astro - Department of Astronomy [Gainesville]
13 ROE - Royal Observatory Edinburgh
14 MPE - Max-Planck-Institut für Extraterrestrische Physik
15 UAB - University of Alabama at Birmingham [ Birmingham]
16 Leiden Observatory [Leiden]

We present preliminary results about the detection of high redshift (U)LIRGs in the Bullet cluster field by the PACS and SPIRE instruments within the Herschel Lensing Survey (HLS) Program. We describe in detail a photometric procedure designed to recover robust fluxes and deblend faint Herschel sources near the confusion noise. The method is based on the use of the positions of Spitzer/MIPS 24 μm sources as priors. Our catalogs are able to reliably (5σ) recover galaxies with fluxes above 6 and 10 mJy in the PACS 100 and 160 μm channels, respectively, and 12 to 18 mJy in the SPIRE bands. We also obtain spectral energy distributions covering the optical through the far-infrared/millimeter spectral ranges of all the Herschel detected sources, and analyze them to obtain independent estimations of the photometric redshift based on either stellar population or dust emission models. We exemplify the potential of the combined use of Spitzer position priors plus independent optical and IR photometric redshifts to robustly assign optical/NIR counterparts to the sources detected by Herschel and other (sub-)mm instruments. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

Mots clés: infrared: galaxies; submillimeter: galaxies; galaxies: evolution; galaxies: high-redshift; gravitational lensing: strong; galaxies: photometry

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]

P. G. Pérez-González, E. Egami, M. Rex, T. D. Rawle, J.-P. Kneib, et al.. Improving the identification of high-z Herschel sources with position priors and optical/NIR and FIR/mm photometric redshifts. Astronomy and Astrophysics - A&A, 2010, 518, pp.L15. ⟨10.1051/0004-6361/201014593⟩. ⟨hal-00660711⟩