Journal Article

The <i>GALEX</i>–SDSS NUV and FUV flux density and local star formation rate

A. S. G. Robotham and S. P. Driver

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 4, pages 2570-2582
Published in print June 2011 | ISSN: 0035-8711
Published online May 2011 | e-ISSN: 1365-2966 | DOI:
The GALEX–SDSS NUV and FUV flux density and local star formation rate

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We calculate the local ultraviolet (UV) flux density in the Galaxy Evolution Explorer (GALEX) Medium Imaging Survey (MIS) far-UV (FUV) and near-UV (NUV) bands using redshifts provided by Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7). Luminosity functions are calculated for the overlapping MIS and SDSS sample, allowing flux densities to be measured and the local star formation rate (SFR) to be calculated using volumes much larger than previous FUV-based estimates. We calculate flux densities for a dust-corrected low-redshift (0.013 ≤ z ≤ 0.1) sample of fν–FUV= 22.24 ± 3.13 × 1025 h erg s−1 Hz−1 Mpc−3, fν–NUV= 38.54 ± 5.30 × 1025 h erg s−1 Hz−1 Mpc−3. The SFR density found is 0.0312 ± 0.0045 h M yr−1 Mpc−3. This is larger than published rates recently found using the UV implied SFR, though the major discrepancy is the correction made for dust attenuation and once this is dealt with consistently the results agree well. These values are also consistent with recent Hα derived SFRs. Once cosmic variance is taken into account most of the recent SFRs at low redshift (z ≤ 0.3) found in the literature can be brought into agreement, however, the lowest redshift values (z ≤ 0.045) do appear to be significantly lower.

Keywords: surveys; galaxies: star formation; ultraviolet: galaxies

Journal Article.  8952 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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