HAL : hal-00662074, version 1

arXiv : 1201.2908

Fiche détaillée

Récupérer au format BibTeX - EndNote - TEI - RefWorks -

A bright z=5.2 lensed submillimeter galaxy in the field of Abell 773: HLSJ091828.6+514223

F. Combes 1, M. Rex 2, T. D. Rawle 3, E. Egami 3, F. Boone 4, I. Smail 5, J. Richard 6, R. J. Ivison 7, M. Gurwell 8, C. M. Casey, A. Omont 9, A. Berciano Alba, M. Dessauges-Zavadsky 10, A. C. Edge 11, G. G. Fazio 12, J-P. Kneib 13, 14, N. Okabe 15, R. Pello 4, P. G. Perez-Gonzalez 16, D. Schaerer 4, G. P. Smith 17, 18, 19, A. M. Swinbank 11, P. van der Werf 20

(18/01/2012)

During our Herschel Lensing Survey (HLS) of massive galaxy clusters, we have discovered an exceptionally bright source behind the z=0.22 cluster Abell 773, which appears to be a strongly lensed submillimeter galaxy (SMG) at z=5.2429. This source is unusual compared to most other lensed sources discovered by Herschel so far, because of its higher submm flux (\sim 200mJy at 500\micron) and its high redshift. The dominant lens is a foreground z=0.63 galaxy, not the cluster itself. The source has a far-infrared (FIR) luminosity of L_FIR= 1.1 10^{14}/\mu Lo, where \mu is the magnification factor, likely \sim 11. We report here the redshift identification through CO lines with the IRAM-30m, and the analysis of the gas excitation, based on CO(7-6), CO(6-5), CO(5-4) detected at IRAM and the CO(2-1) at the EVLA. All lines decompose into a wide and strong red component, and a narrower and weaker blue component, 540\kms apart. Assuming the ultraluminous galaxy (ULIRG) CO-to-H2 conversion ratio, the H2 mass is 5.8 10^{11}/\mu Mo, of which one third is in a cool component. From the CI line we derive a CI/H2 number abundance of 6 10^{-5} similar to that in other ULIRGs. The H2O line is strong only in the red velocity component, with an intensity ratio I(H_2O)/I(CO) \sim 0.5, suggesting a strong local FIR radiation field, possibly from an active nucleus (AGN) component. We detect the [NII]205\mics line for the first time at high-z. It shows comparable blue and red components, with a strikingly broad blue one, suggesting strong ionized gas flows.

1 :	LVMT (LVMT)
	Université Paris-Est Marne-la-Vallée (UPEMLV)
2 :	Alfred Wegener Institute for Polar and Marine Research
	Helmholtz Center for Polar and Marine Research
3 :	Steward Observatory
	University of Arizona
4 :	Institut de recherche en astrophysique et planétologie (IRAP)
	CNRS : UMR5277 – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées
5 :	Institute for Computational Cosmology (ICC)
	University of Durham
6 :	Centre de Recherche Astrophysique de Lyon (CRAL)
	CNRS : UMR5574 – INSU – Université Claude Bernard - Lyon I – École Normale Supérieure - Lyon
7 :	Royal Observatory Edinburgh
	Royal Observatory Edinburgh
8 :	Centre for Astronomy
	Harvard university (Cambridge, USA)
9 :	Institut d'Astrophysique de Paris (IAP)
	CNRS : UMR7095 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI
10 :	Observatoire de Geneve
	University of Geneva
11 :	Department of Physics
	Durham University
12 :	Harvard-Smithsonian Center for Astrophysics (CFA)
	Smithsonian Institution – University of Harvard
13 :	UMS 831 unité mixte de service (UMS 831)
	CNRS : UMS831 – Institut de recherche pour le développement [IRD] – CNES – INSU – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées
14 :	Laboratoire d'Astrophysique de Marseille (LAM)
	CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I
15 :	Astronomical institute, Tohoku University
	ohoku University
16 :	Departamento de Física y Astronomía
	Universidad Complutense Madrid
17 :	Univ. Birmingham
	Univ. Birmingham
18 :	University of Bristol
	University of Bristol
19 :	University of Reading (UOR)
	University of Reading
20 :	Leiden Observatory
	University of Leiden

Domaine

:

Planète et Univers/Astrophysique/Astrophysique galactique Physique/Astrophysique/Astrophysique galactique

hal-00662074, version 1

http://hal.archives-ouvertes.fr/hal-00662074

oai:hal.archives-ouvertes.fr:hal-00662074

Contributeur : Catherine Beaussier <>

Soumis le : Lundi 23 Janvier 2012, 11:00:24

Dernière modification le : Lundi 23 Janvier 2012, 11:00:24