期刊
ASTRONOMY & ASTROPHYSICS
卷 554, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321478
关键词
galaxies: evolution; galaxies: high-redshift; infrared: galaxies
资金
- Spanish Ministerio de Economia y Competitividad (MINECO) [AYA2011-29517-C03-01]
- NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- Very Large Telescope at the ESO Paranal Observatory [LP175.A-0839]
- ESO Telescopes at the La Silla or Paranal Observatories [171.A-3045]
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 similar to 3 in the GOODS-North and GOODS-South fields that are individually detected in PACS-100 mu m or PACS-160 mu m. These detections demonstrate the possibility of measuring the dust emission of LBGs at high redshift. We find that PACS-detected LBGs at z similar to 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 similar to 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 similar to 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 similar to 1.
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