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GALEX-SDSS-WISE Legacy Catalog (GSWLC): Star Formation Rates, Stellar Masses and Dust Attenuations of 700,000 Low-redshift Galaxies

Salim, Samir and Lee, Janice C. and Janowiecki, Steven and da Cunha, Elisabete and Dickinson, Mark and Boquien, Médéric and Burgarella, Denis and Salzer, John J. and Charlot, Stéphane (2016) GALEX-SDSS-WISE Legacy Catalog (GSWLC): Star Formation Rates, Stellar Masses and Dust Attenuations of 700,000 Low-redshift Galaxies. Astrophysical Journal Supplement Series, 227 (1). Art. No. 2. ISSN 0067-0049. doi:10.3847/0067-0049/227/1/2.

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In this paper, we present the GALEX–SDSS–WISE Legacy Catalog (GSWLC), a catalog of physical properties (stellar masses, dust attenuations, and star formation rates [SFRs]) for ~700,000 galaxies with Sloan Digital Sky Survey (SDSS) redshifts below 0.3. GSWLC contains galaxies within the Galaxy Evolution Explorer footprint, regardless of a UV detection, covering 90% of SDSS. The physical properties were obtained from UV/optical spectral energy distribution (SED) fitting following Bayesian methodology of Salim et al., with improvements such as blending corrections for low-resolution UV photometry, flexible dust attenuation laws, and emission-line corrections. GSWLC also includes mid-IR SFRs derived from IR templates based on 22 µm Wide-field Infrared Survey Explorer observations. These estimates are independent of UV/optical SED fitting, in order to separate possible systematics. The paper argues that the comparison of specific SFRs (sSFRs) is more informative and physically motivated than the comparison of SFRs. The sSFRs resulting from the UV/optical SED fitting are compared to the mid-IR sSFRs and to sSFRs from three published catalogs. For "main-sequence" galaxies with no active galactic nucleus (AGN) all sSFRs are in very good agreement (within 0.1 dex on average). In particular, the widely used aperture-corrected SFRs from the MPA/JHU catalog show no systematic offsets, in contrast to some integral field spectroscopy results. For galaxies below the main sequence (log sSFR $\lt -11$), mid-IR (s)SFRs based on fixed luminosity–SFR conversion are severely biased (up to 2 dex) because the dust is primarily heated by old stars. Furthermore, mid-IR (s)SFRs are overestimated by up to 0.6 dex for galaxies with AGNs, presumably due to nonstellar dust heating. UV/optical (s)SFRs are thus preferred to IR-based (s)SFRs for quenched galaxies and those that host AGNs.

Item Type:Article
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URLURL TypeDescription Paper
Salim, Samir0000-0003-2342-7501
Lee, Janice C.0000-0002-2278-9407
da Cunha, Elisabete0000-0001-9759-4797
Dickinson, Mark0000-0001-5414-5131
Boquien, Médéric0000-0003-0946-6176
Additional Information:© 2016 American Astronomical Society. Received 2016 August 22; revised 2016 September 28; accepted 2016 September 30; published 2016 November 9. The construction of GSWLC was funded through NASA ADAP award NNX12AE06G. We thank Sara Ellison for valuable comments. S.S. thanks the members of the GALEX science team for their contributions over the years, especially Tim Heckman, Chris Martin, R. Michael Rich, and Mark Seibert. 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 website is Based on observations made with the NASA Galaxy Evolution Explorer. 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
Subject Keywords:galaxies: fundamental parameters; galaxies: star formation
Issue or Number:1
Record Number:CaltechAUTHORS:20161116-135817113
Persistent URL:
Official Citation:Samir Salim et al 2016 ApJS 227 2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72061
Deposited By: Ruth Sustaita
Deposited On:17 Nov 2016 00:15
Last Modified:11 Nov 2021 04:55

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