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GOODS-Herschel: dust attenuation properties of UV selected high redshift galaxies

Buat, V. and Noll, S. and Burgarella, D. and Giovannolli, E. and Charmandaris, V. and Pannella, M. and Hwang, H. S. and Elbaz, D. and Dickinson, M. and Magdis, G. and Reddy, N. and Murphy, E. J. (2012) GOODS-Herschel: dust attenuation properties of UV selected high redshift galaxies. Astronomy and Astrophysics, 545 . Art. No. A141. ISSN 0004-6361. doi:10.1051/0004-6361/201219405.

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Context. Dust attenuation in galaxies is poorly known, especially at high redshift. And yet the amount of dust attenuation is a key parameter to deduce accurate star formation rates from ultraviolet (UV) rest-frame measurements. The wavelength dependence of the dust attenuation is also of fundamental importance to interpret the observed spectral energy distributions (SEDs) and to derive photometric redshifts or physical properties of galaxies. Aims. We want to study dust attenuation at UV wavelengths at high redshift, where the UV is redshifted to the observed visible light wavelength range. In particular, we search for a UV bump and related implications for dust attenuation determinations. Methods. We use photometric data in the Chandra Deep Field South (CDFS), obtained in intermediate and broad band filters by the MUSYC project, to sample the UV rest-frame of 751 galaxies with 0.95 < z < 2.2. When available, infrared (IR) Herschel/PACS⋆⋆ data from the GOODS-Herschel project, coupled with Spitzer/MIPS measurements, are used to estimate the dust emission and to constrain dust attenuation. The SED of each source is fit using the CIGALE code. The amount of dust attenuation and the characteristics of the dust attenuation curve are obtained as outputs of the SED fitting process, together with other physical parameters linked to the star formation history. Results. The global amount of dust attenuation at UV wavelengths is found to increase with stellar mass and to decrease as UV luminosity increases. A UV bump at 2175 Å is securely detected in 20% of the galaxies, and the mean amplitude of the bump for the sample is similar to that observed in the extinction curve of the LMC supershell region. This amplitude is found to be lower in galaxies with very high specific star formation rates, and 90% of the galaxies exhibiting a secure bump are at z < 1.5. The attenuation curve is confirmed to be steeper than that of local starburst galaxies for 20% of the galaxies. The large dispersion found for these two parameters describing the attenuation law is likely to reflect a wide diversity of attenuation laws among galaxies. The relations between dust attenuation, IR-to-UV flux ratio, and the slope of the UV continuum are derived for the mean attenuation curve found for our sample. Deviations from the average trends are found to correlate with the age of the young stellar population and the shape of the attenuation curve.

Item Type:Article
Related URLs:
URLURL TypeDescription
Charmandaris, V.0000-0002-2688-1956
Elbaz, D.0000-0002-7631-647X
Dickinson, M.0000-0001-5414-5131
Magdis, G.0000-0002-4872-2294
Reddy, N.0000-0001-9687-4973
Murphy, E. J.0000-0001-7089-7325
Additional Information:© 2012 ESO. Received 13 April 2012. Accepted 14 June 2012. Publisher online, September 25, 2012. This work is partially supported by the French National Agency for research (ANR-09-BLAN-0224). Support for the US-based coauthors was provided by NASA through an award issued by JPL/Caltech. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAFIFSI/ OAA/OAP/OAT, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain).
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)ANR-09-BLAN-0224
Bundesministerium für Verkehr, Innovation und Technologie (BMVIT)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Comisión Interministerial de Ciencia y Tecnología (CICYT)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Ministerio de Ciencia Y Tecnologia (MCYT)UNSPECIFIED
Subject Keywords:galaxies: high-redshift galaxies: ISM galaxies: starburst ultraviolet: galaxies dust, extinction
Record Number:CaltechAUTHORS:20130115-132514152
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Official Citation:GOODS-Herschel: dust attenuation properties of UV selected high redshift galaxies V. Buat, S. Noll, D. Burgarella, E. Giovannoli, V. Charmandaris, M. Pannella, H. S. Hwang, D. Elbaz, M. Dickinson, G. Magdis, et al. (2 more) Published online: 25 September 2012 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36396
Deposited By: Ruth Sustaita
Deposited On:15 Jan 2013 21:50
Last Modified:09 Nov 2021 23:21

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