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

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posted on 2023-06-08, 21:14 authored by M L P Gunawardhana, A M Hopkins, E N Taylor, J Bland-Hawthorn, P Norberg, I K Baldry, Jonathan LovedayJonathan Loveday, M S Owers, Stephen WilkinsStephen Wilkins, M Colless, M J I Brown, S P Driver, M Alpaslan, S Brough, M Cluver, S Croom, L Kelvin, M A Lara-Lopez, J Liske, Á R López-Sánchez, A S G Robotham
We present bivariate luminosity and stellar mass functions of Ha 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 < SFRHa (M? yr-1) < 100 galaxies, the requirement for an Ha 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) and M densities. Furthermore, we obtain the r-band luminosity functions (LFs) and stellar mass functions of Ha star-forming galaxies from the bivariate LFs. As our sample is selected on the basis of detected Ha 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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

1

Volume

447

Page range

875-901

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2015-06-24

First Open Access (FOA) Date

2015-06-24

First Compliant Deposit (FCD) Date

2015-06-24

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