TY - JOUR
T1 - Galaxy and Mass Assembly (GAMA) : M*-Re relations of z = 0 bulges, discs and spheroids
AU - Lange, Rebecca
AU - Moffett, Amanda J.
AU - Driver, Simon P.
AU - Robotham, Aaron S. G.
AU - Lagos, Claudia del P.
AU - Kelvin, Lee S.
AU - Conselice, Christopher
AU - Margalef-Bentabol, Berta
AU - Alpaslan, Mehmet
AU - Baldry, Ivan
AU - Bland-Hawthorn, Joss
AU - Bremer, Malcolm
AU - Brough, Sarah
AU - Cluver, Michelle
AU - Colless, Matthew
AU - Davies, Luke J. M.
AU - Häußler, Boris
AU - Holwerda, Benne W.
AU - Hopkins, Andrew M.
AU - Kafle, Prajwal R.
AU - Kennedy, Rebecca
AU - Liske, Jochen
AU - Phillipps, Steven
AU - Popescu, Cristina C.
AU - Taylor, Edward N.
AU - Tuffs, Richard
AU - van Kampen, Eelco
AU - Wright, Angus H.
PY - 2016
Y1 - 2016
N2 - We perform automated bulge + disc decomposition on a sample of ~7500 galaxies from the Galaxy And Mass Assembly (GAMA) survey in the redshift range of 0.002 < z < 0.06 using Structural Investigation of Galaxies via Model Analysis, a wrapper around GALFIT3. To achieve robust profile measurements, we use a novel approach of repeatedly fitting the galaxies, varying the input parameters to sample a large fraction of the input parameter space. Using this method, we reduce the catastrophic failure rate significantly and verify the confidence in the fit independently of χ2. Additionally, using the median of the final fitting values and the 16th and 84th percentile produces more realistic error estimates than those provided by GALFIT, which are known to be underestimated. We use the results of our decompositions to analyse the stellar mass - half-light radius relations of bulges, discs and spheroids. We further investigate the association of components with a parent disc or elliptical relation to provide definite z = 0 disc and spheroid M*-Re relations. We conclude by comparing our local disc and spheroid *-Re to simulated data from EAGLE and high-redshift data from Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey-Ultra Deep Survey. We show the potential of using the *-Re relation to study galaxy evolution in both cases but caution that for a fair comparison, all data sets need to be processed and analysed in the same manner.
AB - We perform automated bulge + disc decomposition on a sample of ~7500 galaxies from the Galaxy And Mass Assembly (GAMA) survey in the redshift range of 0.002 < z < 0.06 using Structural Investigation of Galaxies via Model Analysis, a wrapper around GALFIT3. To achieve robust profile measurements, we use a novel approach of repeatedly fitting the galaxies, varying the input parameters to sample a large fraction of the input parameter space. Using this method, we reduce the catastrophic failure rate significantly and verify the confidence in the fit independently of χ2. Additionally, using the median of the final fitting values and the 16th and 84th percentile produces more realistic error estimates than those provided by GALFIT, which are known to be underestimated. We use the results of our decompositions to analyse the stellar mass - half-light radius relations of bulges, discs and spheroids. We further investigate the association of components with a parent disc or elliptical relation to provide definite z = 0 disc and spheroid M*-Re relations. We conclude by comparing our local disc and spheroid *-Re to simulated data from EAGLE and high-redshift data from Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey-Ultra Deep Survey. We show the potential of using the *-Re relation to study galaxy evolution in both cases but caution that for a fair comparison, all data sets need to be processed and analysed in the same manner.
UR - https://hdl.handle.net/1959.7/uws:66064
U2 - 10.1093/mnras/stw1495
DO - 10.1093/mnras/stw1495
M3 - Article
SN - 0035-8711
VL - 462
SP - 1470
EP - 1500
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -