Galaxy And Mass Assembly: evolution of the Hα luminosity function and star formation rate density up to z <0.35

M. L. P. Gunawardhana, Andrew M. Hopkins, Joss Bland-Hawthorn, Sarah Brough, Robert G. Sharp, Jon Loveday, Edward N. Taylor, David Heath Jones, M. A. Lara-Lopez, A. E. Bauer, Matthew Colless, M. S. Owers, Ivan K. Baldry, Angel R. Lopez-Sanchez, C. Foster, Steven P. Bamford, Michael J. I. Brown, Simon P. Driver, Michael J. Drinkwater, Jochen LiskeM. J. Meyer, Peder Norberg, Aaron S. G. Robotham, J. H. Y. Ching, M. E. Cluver, Scott M. Croom, Lee S. Kelvin, Matthew Prescott, Oliver Steele, Daniel Thomas, L. Wang

Research output: Contribution to journalArticlepeer-review


Measurements of the low-z Hα luminosity function, Φ, have a large dispersion in the local number density of sources (∼0.5–1 Mpc−3 dex−1), and correspondingly in the star formation rate density (SFRD). The possible causes for these discrepancies include limited volume sampling, biases arising from survey sample selection, different methods of correcting for dust obscuration and active galactic nucleus contamination. The Galaxy And Mass Assembly (GAMA) survey and Sloan Digital Sky Survey (SDSS) provide deep spectroscopic observations over a wide sky area enabling detection of a large sample of star-forming galaxies spanning 0.001 < SFR (M yr− 1) < 100 with which to robustly measure the evolution of the SFRD in the low-z Universe. The large number of high-SFR galaxies present in our sample allow an improved measurement of the bright end of the luminosity function, indicating that the decrease in Φ at bright luminosities is best described by a Saunders functional form rather than the traditional Schechter function. This result is consistent with other published luminosity functions in the far-infrared and radio. For GAMA and SDSS, we find the r-band apparent magnitude limit, combined with the subsequent requirement for Hα detection leads to an incompleteness due to missing bright Hα sources with faint r-band magnitudes.
Original languageEnglish
Pages (from-to)2764-2789
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date29 Jun 2013
Publication statusPublished - 21 Aug 2013


  • surveys
  • galaxies: evolution
  • galaxies: formation
  • galaxies: interactions
  • galaxies: luminosity function
  • mass function
  • galaxies: starburst


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