| Issue |
A&A
Volume 554, June 2013
|
|
|---|---|---|
| Article Number | L3 | |
| Number of page(s) | 8 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361/201321478 | |
| Published online | 04 June 2013 | |
Far-infrared-detected Lyman-break galaxies at z ~ 3⋆,⋆⋆
Dust attenuation and dust correction factors at high redshift
1
Instituto de Astrofísica de Canarias (IAC),
38200
La Laguna, Tenerife,
Spain
e-mail:
ioteo@iac.es
2
Departamento de Astrofísica, Universidad de La Laguna
(ULL), 38205, La
Laguna, Tenerife,
Spain
3
Asociación ASPID, Apartado de Correos 412, La
Laguna, Tenerife,
Spain
4
Centro de Estudios de Física del Cosmos de Aragón, Plaza San Juan
1, Planta 2, 44001
Teruel,
Spain
5
Herschel Science Centre (ESAC), Villafranca del Castillo,
Spain
6
Centro de Astrobiología, INTA-CSIC, PO Box – Apdo. de correos
78, Villanueva de la Cañada
Madrid
28691,
Spain
7
XMM/Newton Science Operations Centre (ESAC),
Villafranca del Castillo,
Spain
Received: 14 March 2013
Accepted: 8 April 2013
Lyman-break galaxies (LBGs) represent one of the kinds of star-forming galaxies that are found in the high-redshift universe. The detection of LBGs in the far-infrared (FIR) domain can provide very important clues on their dust attenuation and total star-formation rate (SFR), allowing a more detailed study than has been performed so far. In this work we explore the FIR emission of a sample of 16 LBGs at z ~ 3 in the GOODS-North and GOODS-South fields that are individually detected in PACS-100 μm or PACS-160 μm. These detections demonstrate the possibility of measuring the dust emission of LBGs at high redshift. We find that PACS-detected LBGs at z ~ 3 are highly obscured galaxies which belong to the ultra-luminous or hyper-luminous IR galaxy class. Their total SFR cannot be recovered with the dust attenuation factors obtained from their UV continuum slope or their SED-derived dust attenuation employing Bruzual & Charlot (2003) templates. Both methods underestimate the results for most of the galaxies. Comparing with a sample of PACS-detected LBGs at z ~ 1, we find evidence that the FIR emission of LBGs might have changed with redshift, in the sense that the dustiest LBGs found at z ~ 3 have more prominent FIR emission, are dustier for a given UV slope, and have higher SFR for a given stellar mass than the dustiest LBGs found at z ~ 1.
Key words: galaxies: evolution / galaxies: high-redshift / infrared: galaxies
Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Appendix A is available in electronic form at http://www.aanda.org
© ESO, 2013
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