Galaxy And Mass Assembly (GAMA) : bivariate functions of Hα star-forming galaxies
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We present bivariate luminosity and stellar mass functions of Hα star-forming galaxies drawn from the Galaxy And Mass Assembly (GAMA) survey. While optically deep spectroscopic observations of GAMA over a wide sky area enable the detection of a large number of 0.001 <SFR (M yr) <100 galaxies, the requirement for an Hα detection in targets selected from an r-band magnitude-limited survey leads to an incompleteness due to missing optically faint star-forming galaxies. Using z <0.1 bivariate distributions as a reference we model the higher-z distributions, thereby approximating a correction for the missing optically faint star-forming galaxies to the local star formation rate (SFR) andMdensities. Furthermore, we obtain the r-band luminosity functions (LFs) and stellar mass functions of Hα star-forming galaxies from the bivariate LFs.As our sample is selected on the basis of detectedHα emission, a direct tracer of ongoing star formation, this sample represents a true star-forming galaxy sample, and is drawn from both photometrically classified blue and red subpopulations, though mostly from the blue population. On average 20-30 per cent of red galaxies at all stellar masses are star forming, implying that these galaxies may be dusty star-forming systems.
Gunawardhana , M L P , Hopkins , A M , Taylor , E N , Bland-Hawthorn , J , Norberg , P , Baldry , I K , Loveday , J , Owers , M S , Wilkins , S M , Colless , M , Brown , M J I , Driver , S P , Alpaslan , M , Brough , S , Cluver , M , Croom , S , Kelvin , L , Lara-López , M A , Liske , J , López-Sánchez , A R & Robotham , A S G 2015 , ' Galaxy And Mass Assembly (GAMA) : bivariate functions of Hα star-forming galaxies ' Monthly Notices of the Royal Astronomical Society , vol 447 , no. 1 , pp. 875-901 . DOI: 10.1093/mnras/stu2232
Monthly Notices of the Royal Astronomical Society
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
MLPG and PN acknowledge support from a European Research Council Starting Grant (DEGAS-259586).
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