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Article
GAMA/H-ATLAS : common star formation rate indicators and their dependence on galaxy physical parameters.
Faculty Scholarship
  • L. Wang, Durham University
  • P. Norberg, Durham University
  • M. L. P. Gunawardhana, Durham University
  • S. Heinis, University of Maryland at College Park
  • I. K. Baldry, Liverpool John Moores University
  • J. Bland-Hawthorn, University of Sydney
  • N. Bourne, University of Edinburgh
  • S. Brough, Australian Astronomical Observatory
  • M. J. I. Brown, Monash University
  • M. E. Cluver, The University of Western Cape
  • A. Cooray, University of California, Irvine
  • E. da Cunha, Swinburne University of Technology - Australia
  • S. P. Driver, University of Western Australia
  • L. Dunne, Cardiff University
  • S. Dye, University of Nottingham
  • S. Eales, Cardiff University
  • M. W. Grootes, Max Planck Institut fuer Kernphysik
  • Benne W. Holwerda, University of Louisville
  • A. M. Hopkins, Australian Astronomical Observatory
  • E. Ibar, Universidad de Valparaiso
  • R. Ivison, University of Edinburgh
  • C. Lacey, Durham University
  • M. A. Lara-Lopez, Universidad Nacional Autonoma de Mexico
  • J. Loveday, University of Sussex at Brighton
  • S. J. Maddox, Cardiff University
  • M. J. Michalowski, University of Edinburgh
  • I. Oteo, University of Edinburgh
  • M. S. Owers, Macquarie University
  • C. C. Popescu, University of Central Lancashire
  • D. J. B. Smith, University of Hertfordshire
  • E. N. Taylor, The University of Melbourne
  • R. J. Tuffs, Max Planck Institut fuer Kernphysik
  • P. van der Werf, Leiden University
Document Type
Article
Publication Date
9-11-2016
Department
Physics and Astronomy
Abstract

We compare common star formation rate (SFR) indicators in the local Universe in the Galaxy and Mass Assembly (GAMA) equatorial fields (∼160 deg2), using ultraviolet (UV) photometry from GALEX, far-infrared and sub-millimetre (sub-mm) photometry from Herschel Astrophysical Terahertz Large Area Survey, and Hα spectroscopy from the GAMA survey. With a high-quality sample of 745 galaxies (median redshift z = 0.08), we consider three SFR tracers: UV luminosity corrected for dust attenuation using the UV spectral slope β (SFRUV, corr), Hα line luminosity corrected for dust using the Balmer decrement (BD) (SFRH α, corr), and the combination of UV and infrared (IR) emission (SFRUV + IR). We demonstrate that SFRUV, corr can be reconciled with the other two tracers after applying attenuation corrections by calibrating Infrared excess (IRX; i.e. the IR to UV luminosity ratio) and attenuation in the Hα (derived from BD) against β. However, β, 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 (M∗), z and dust temperature (Tdust), but not on Hα equivalent width or Sersic index. Due to the large scatter in the IRX versus β correlation, when compared to SFRUV + IR, the β-corrected SFRUV, corr exhibits systematic deviations as a function of IRX, BD and Tdust.

Comments

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Copyright: 2016. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

https://doi.org/10.1093/mnras/stw1450

DOI
10.1093/mnras/stw1450
Citation Information

Wang, L., et al. "GAMA/H-ATLAS: Common Star-Formation Rate Indicators and Their Dependence on Galaxy Physical Parameters." 2016. Monthly Notices of the Royal Astronomical Society 461(2): 1898-1916.