Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 447, Issue 1, Pages 875-901Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu2232
Keywords
surveys; galaxies: evolution; galaxies: luminosity function, mass function; galaxies: star formation
Categories
Funding
- Australian Postgraduate Award
- Australian Astronomical Observatory PhD scholarship
- European Research Council [DEGAS-259586]
- STFC (UK)
- ARC (Australia)
- AAO
- STFC [ST/K003577/1, ST/L000652/1, ST/J002291/1, ST/L00075X/1, ST/I003088/1, ST/L005042/1, ST/J004650/1, ST/H00131X/1, ST/H008578/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J002291/1, ST/L000652/1, ST/L00075X/1, ST/K003577/1, ST/J004650/1, ST/H00131X/1, ST/I003088/1, ST/M000966/1, ST/H008578/1, ST/L005042/1] Funding Source: researchfish
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We present bivariate luminosity and stellar mass functions of H alpha 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 < SFRH alpha (M-circle dot yr(-1)) < 100 galaxies, the requirement for an H alpha 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 H alpha star-forming galaxies from the bivariate LFs. As our sample is selected on the basis of detected H alpha 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.
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