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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.