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Galaxy And Mass Assembly (GAMA) : bivariate functions of Hα star-forming galaxies

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Date
11/02/2015
Author
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.
Keywords
Surveys
Galaxies: evolution
Galaxies: luminosity function, mass function
Galaxies: star formation
QB Astronomy
QC Physics
3rd-DAS
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Abstract
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.
Citation
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 . https://doi.org/10.1093/mnras/stu2232
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu2232
ISSN
0035-8711
Type
Journal article
Rights
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
Description
MLPG and PN acknowledge support from a European Research Council Starting Grant (DEGAS-259586).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/6163

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