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

Combes, F.; Rex, M.; Rawle, T.D.; Egami, E.; Boone, F.; Smail, I.; Richard, J.; Ivison, R.J.; Gurwell, M.; Casey, CM.; Omont, A.; Berciano Alba, A.; Dessauges-Zavadsky, M.; Edge, A.C.; Fazio, G.G.; Kneib, J.-P.; Okabe, N.; Pelló, R.; Pérez-González, P.G.; Schaerer, D.; Smith, G.P.; Swinbank, A.M.; van der Werf, P.

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


Authors

F. Combes

M. Rex

T.D. Rawle

E. Egami

F. Boone

J. Richard

R.J. Ivison

M. Gurwell

CM. Casey

A. Omont

A. Berciano Alba

M. Dessauges-Zavadsky

G.G. Fazio

J.-P. Kneib

N. Okabe

R. Pelló

P.G. Pérez-González

D. Schaerer

G.P. Smith

A.M. Swinbank

P. van der Werf



Abstract

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 (~200 mJy at 500 μm) 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 LFIR = 1.1 × 1014/μ L⊙, where μ is the magnification factor, likely ~11. We report here the redshift identification through CO lines with the IRAM-30 m, 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 km s-1 apart. Assuming the ultraluminous galaxy (ULIRG) CO-to-H2 conversion ratio, the H2  mass is 5.8 × 1011/μ M⊙, of which one third is in a cool component. From the C I(3P2-3P1) line we derive a C I/H2  number abundance of 6 × 10-5 similar to that in other ULIRGs. The H2Op(2,0,2−1,1,1) line is strong only in the red velocity component, with an intensity ratio I(H2O)/I(CO) ~ 0.5, suggesting a strong local FIR radiation field, possibly from an active nucleus (AGN) component. We detect the [NII]205 μm 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.

Citation

Combes, F., Rex, M., Rawle, T., Egami, E., Boone, F., Smail, I., …van der Werf, P. (2012). A bright z = 5.2 lensed submillimeter galaxy in the field of Abell 773 : HLSJ091828.6+514223. Astronomy & Astrophysics, 538, Article L4. https://doi.org/10.1051/0004-6361/201118750

Journal Article Type Article
Publication Date Feb 1, 2012
Deposit Date Apr 8, 2013
Publicly Available Date Mar 28, 2024
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 538
Article Number L4
DOI https://doi.org/10.1051/0004-6361/201118750
Keywords Galaxies, Evolution, High-redshift, ISM, infrared, Submillimeter, HLSJ091828.6+514223.

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