TY - JOUR
T1 - Galaxy And Mass Assembly (GAMA)
T2 - bivariate functions of Hα star-forming galaxies
AU - Gunawardhana, M.L.P.
AU - Hopkins, A.M.
AU - Taylor, E.N.
AU - Bland-Hawthorn, J.
AU - Norberg, P.
AU - Baldry, I.K.
AU - Loveday, J.
AU - Owers, M.S.
AU - Wilkins, S.M.
AU - Colless, M.
AU - Brown, M.J. I.
AU - Driver, S.P.
AU - Alpaslan, M.
AU - Brough, S.
AU - Cluver, M.
AU - Croom, S.
AU - Kelvin, L.
AU - Lara-López, M.A.
AU - Liske, J.
AU - López-Sánchez, A.R.
AU - Robotham, A.S. G.
N1 - MLPG and PN acknowledge support from a European Research Council Starting Grant (DEGAS-259586).
PY - 2015/2/11
Y1 - 2015/2/11
N2 - 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.
AB - 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.
KW - Surveys
KW - Galaxies: evolution
KW - Galaxies: luminosity function, mass function
KW - Galaxies: star formation
U2 - 10.1093/mnras/stu2232
DO - 10.1093/mnras/stu2232
M3 - Article
AN - SCOPUS:84922439166
SN - 0035-8711
VL - 447
SP - 875
EP - 901
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -