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GAMA/H-ATLAS: Common star-formation rate indicators and their dependence on galaxy physical parameters

Wang, L and Norberg, P and Gunawardhana, MLP and Heinis, S and Baldry, IK and Bland-Hawthorn, J and Bourne, N and Brough, S and Brown, MJI and Cluver, ME and Cooray, A and Cunha, ED and Driver, SP and Dunne, L and Dye, S and Eales, S and Grootes, MW and Holwerda, BW and Hopkins, AM and Ibar, E and Ivison, R and Lacey, C and Lara-Lopez, MA and Loveday, J and Maddox, SJ and lowski, MJM and Oteo, I and Owers, MS and Popescu, CC and Smith, DJB and Taylor, EN and Tuffs, RJ and Werf, PVD (2016) GAMA/H-ATLAS: Common star-formation rate indicators and their dependence on galaxy physical parameters. Monthly Notices of the Royal Astronomical Society, 461 (2). pp. 1898-1916. ISSN 0035-8711

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Abstract

We compare common star-formation rate (SFR) indicators in the local Universe in the GAMA equatorial fields (around 160 sq. deg.), using ultraviolet (UV) photometry from GALEX, far-infrared (FIR) and sub-millimetre (sub-mm) photometry from H-ATLAS, and Halpha spectroscopy from the GAMA survey. With a high-quality sample of 745 galaxies (median redshift 0.08), we consider three SFR tracers: UV luminosity corrected for dust attenuation using the UV spectral slope beta (SFRUV,corr), Halpha line luminosity corrected for dust using the Balmer decrement (BD) (SFRHalpha,corr), and the combination of UV and IR emission (SFRUV+IR). We demonstrate that SFRUV,corr can be reconciled with the other two tracers after applying attenuation corrections by calibrating IRX (i.e. the IR to UV luminosity ratio) and attenuation in the Halpha (derived from BD) against beta. However, beta on its own is very unlikely to be a reliable attenuation indicator. We find that attenuation correction factors depend on parameters such as stellar mass, z and dust temperature (Tdust), but not on Halpha equivalent width (EW) or Sersic index. Due to the large scatter in the IRX vs beta correlation, when compared to SFRUV+IR, the beta-corrected SFRUV,corr exhibits systematic deviations as a function of IRX, BD and Tdust.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 18 Jul 2016 08:54
Last Modified: 07 Nov 2016 15:57
DOI or Identification number: 10.1093/mnras/stw1450
URI: http://researchonline.ljmu.ac.uk/id/eprint/3895

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