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Galaxy And Mass Assembly (GAMA) : mass-size relations of z < 0.1 galaxies subdivided by Sérsic index, colour and morphology

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Date
01/03/2015
Author
Lange, Rebecca
Driver, Simon P.
Robotham, Aaron S. G.
Kelvin, Lee S.
Graham, Alister W.
Alpaslan, Mehmet
Andrews, Stephen K.
Baldry, Ivan K.
Bamford, Steven
Bland-Hawthorn, Joss
Brough, Sarah
Cluver, Michelle E.
Conselice, Christopher J.
Davies, Luke J. M.
Haeussler, Boris
Konstantopoulos, Iraklis S.
Loveday, Jon
Moffett, Amanda J.
Norberg, Peder
Phillipps, Steven
Taylor, Edward N.
Lopez-Sanchez, Angel R.
Wilkins, Stephen M.
Keywords
Galaxies: elliptical and lenticular, cD
Galaxies: formation
Galaxies: fundamental parameters
Galaxies: spiral
Galaxies: statistics
Digital Sky Survey
Dwarf elliptic galaxies
Ultra-deep-field
Disk galaxies
Surface-brightness
Kormedy relation
Luminosity size
Spiral galaxies
Redshift survey
Space density
QB Astronomy
QC Physics
3rd-DAS
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Abstract
We use data from the Galaxy And Mass Assembly (GAMA) survey in the redshift range 0.01 < z < 0.1 (8399 galaxies in g to Ks bands) to derive the stellar mass–half-light radius relations for various divisions of ‘early’- and ‘late’-type samples. We find that the choice of division between early and late (i.e. colour, shape, morphology) is not particularly critical; however, the adopted mass limits and sample selections (i.e. the careful rejection of outliers and use of robust fitting methods) are important. In particular, we note that for samples extending to low stellar mass limits <1010ΜΘ the Sérsic index bimodality, evident for high-mass systems, becomes less distinct and no-longer acts as a reliable separator of early- and late-type systems. The final set of stellar mass–half-light radius relations are reported for a variety of galaxy population subsets in 10 bands (ugrizZY JHKs) and are intended to provide a comprehensive low-z benchmark for the many ongoing high-z studies. Exploring the variation of the stellar mass–half-light radius relations with wavelength, we confirm earlier findings that galaxies appear more compact at longer wavelengths albeit at a smaller level than previously noted: at <1010ΜΘ both spiral systems and ellipticals show a decrease in size of 13 per cent from g to Ks (which is near linear in log wavelength). Finally, we note that the sizes used in this work are derived from 2D Sérsic light profile fitting (using GALFIT3), i.e. elliptical semimajor half-light radii, improving on earlier low-z benchmarks based on circular apertures.
Citation
Lange , R , Driver , S P , Robotham , A S G , Kelvin , L S , Graham , A W , Alpaslan , M , Andrews , S K , Baldry , I K , Bamford , S , Bland-Hawthorn , J , Brough , S , Cluver , M E , Conselice , C J , Davies , L J M , Haeussler , B , Konstantopoulos , I S , Loveday , J , Moffett , A J , Norberg , P , Phillipps , S , Taylor , E N , Lopez-Sanchez , A R & Wilkins , S M 2015 , ' Galaxy And Mass Assembly (GAMA) : mass-size relations of z < 0.1 galaxies subdivided by Sérsic index, colour and morphology ' , Monthly Notices of the Royal Astronomical Society , vol. 447 , no. 3 , pp. 2603-2630 . https://doi.org/10.1093/mnras/stu2467
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu2467
ISSN
0035-8711
Type
Journal article
Rights
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/6525

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