TY - JOUR
T1 - Galaxy And Mass Assembly (GAMA): bivariate functions of Halpha star-forming galaxies
AU - Gunawardhana, Madusha
AU - Hopkins, Andrew Mark
AU - Taylor, Edward N
AU - Bland-Hawthorn, Jonathan
AU - Norberg, Peder
AU - Baldry, Ivan K
AU - Loveday, J
AU - Owers, Matthew S
AU - Wilkins, Stephen M
AU - Colless, Matthew Malcolm
AU - Brown, Michael James Isles
AU - Driver, Simon P
AU - Alpaslan, Mehmet
AU - Brough, Sarah
AU - Cluver, Michelle E
AU - Croom, Scott Martin
AU - Kelvin, Lee S
AU - Lara-Lopez, Maritza Arlene
AU - Liske, J
AU - Lopez-Sanchez, Angel R
AU - Robotham, A S G
PY - 2015
Y1 - 2015
N2 - 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) andMdensities. 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 detectedHa 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 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) andMdensities. 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 detectedHa 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.
UR - http://mnras.oxfordjournals.org/content/447/1/875.full.pdf+html
U2 - 10.1093/mnras/stu2232
DO - 10.1093/mnras/stu2232
M3 - Article
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 -