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Dust Attenuation Curves in the Local Universe: Demographics and New Laws for Star-forming Galaxies and High-redshift Analogs

Salim, Samir and Boquien, Médéric and Lee, Janice C. (2018) Dust Attenuation Curves in the Local Universe: Demographics and New Laws for Star-forming Galaxies and High-redshift Analogs. Astrophysical Journal, 859 (1). Art. No. 11. ISSN 1538-4357. doi:10.3847/1538-4357/aabf3c.

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We study the dust attenuation curves of 230,000 individual galaxies in the local universe, ranging from quiescent to intensely star-forming systems, using GALEX, SDSS, and WISE photometry calibrated on the Herschel ATLAS. We use a new method of constraining SED fits with infrared luminosity (SED+LIR fitting), and parameterized attenuation curves determined with the CIGALE SED-fitting code. Attenuation curve slopes and UV bump strengths are reasonably well constrained independently from one another. We find that A_λ/A_V attenuation curves exhibit a very wide range of slopes that are on average as steep as the curve slope of the Small Magellanic Cloud (SMC). The slope is a strong function of optical opacity. Opaque galaxies have shallower curves—in agreement with recent radiative transfer models. The dependence of slopes on the opacity produces an apparent dependence on stellar mass: more massive galaxies have shallower slopes. Attenuation curves exhibit a wide range of UV bump amplitudes, from none to Milky Way (MW)-like, with an average strength one-third that of the MW bump. Notably, local analogs of high-redshift galaxies have an average curve that is somewhat steeper than the SMC curve, with a modest UV bump that can be, to first order, ignored, as its effect on the near-UV magnitude is 0.1 mag. Neither the slopes nor the strengths of the UV bump depend on gas-phase metallicity. Functional forms for attenuation laws are presented for normal star-forming galaxies, high-z analogs, and quiescent galaxies. We release the catalog of associated star formation rates and stellar masses (GALEX–SDSS–WISE Legacy Catalog 2).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Salim, Samir0000-0003-2342-7501
Boquien, Médéric0000-0003-0946-6176
Lee, Janice C.0000-0002-2278-9407
Additional Information:© 2018 The American Astronomical Society. Received 2018 February 8; revised 2018 April 13; accepted 2018 April 16; published 2018 May 17. The construction of GSWLC was funded through NASA ADAP award NNX12AE06G. We thank Daniella Calzetti and Veronique Buat for valuable discussions. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III Web site is Based on observations made with the NASA Galaxy Evolution Explorer (GALEX). GALEX is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Participating InstitutionsUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:dust, extinction – galaxies: fundamental parameters
Issue or Number:1
Record Number:CaltechAUTHORS:20180517-083144159
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Official Citation:Samir Salim et al 2018 ApJ 859 11
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86437
Deposited By: Tony Diaz
Deposited On:18 May 2018 16:59
Last Modified:15 Nov 2021 20:38

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