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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Galaxy And Mass Assembly (GAMA): Stellar mass estimates
Monthly Notices of the Royal Astronomical Society, Volume 418, No. 3, Year 2011
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Description
This paper describes the first catalogue of photometrically derived stellar mass estimates for intermediate-redshift (z < 0.65; median z= 0.2) galaxies in the Galaxy And Mass Assembly (GAMA) spectroscopic redshift survey. These masses, as well as the full set of ancillary stellar population parameters, will be made public as part of GAMA data release 2. Although the GAMA database does include near-infrared (NIR) photometry, we show that the quality of our stellar population synthesis fits is significantly poorer when these NIR data are included. Further, for a large fraction of galaxies, the stellar population parameters inferred from the optical-plus-NIR photometry are formally inconsistent with those inferred from the optical data alone. This may indicate problems in our stellar population library, or NIR data issues, or both; these issues will be addressed for future versions of the catalogue. For now, we have chosen to base our stellar mass estimates on optical photometry only. In light of our decision to ignore the available NIR data, we examine how well stellar mass can be constrained based on optical data alone. We use generic properties of stellar population synthesis models to demonstrate that restframe colour alone is in principle a very good estimator of stellar mass-to-light ratio, M*/Li. Further, we use the observed relation between restframe (g-i) and M*/Li for real GAMA galaxies to argue that, modulo uncertainties in the stellar evolution models themselves, (g-i) colour can in practice be used to estimate M*/Li to an accuracy of ≲0.1 dex (1σ). This 'empirically calibrated' (g-i)-M*/Li relation offers a simple and transparent means for estimating galaxies' stellar masses based on minimal data, and so provides a solid basis for other surveys to compare their results to z≲0.4 measurements from GAMA. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Authors & Co-Authors
Taylor, Edward N.
Australia, Sydney
The University of Sydney
Australia, Melbourne
University of Melbourne
Hopkins, Andrew M.
Australia
Australian Astronomical Observatory
Baldry, Ivan K.
United Kingdom, Liverpool
Liverpool John Moores University
Brown, Michael J.I.
Australia, Clayton
Monash University
Driver, Simon P.
United Kingdom, St Andrews
University of st Andrews
Kelvin, Lee S.
United Kingdom, St Andrews
University of st Andrews
Hill, David T.
United Kingdom, St Andrews
University of st Andrews
Robotham, Aaron S.G.
United Kingdom, St Andrews
University of st Andrews
Bland-Hawthorn, Joss
Australia, Sydney
The University of Sydney
Jones, Daniel Heath
Australia, Clayton
Monash University
Sharp, Rob G.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Thomas, Daniel B.
United Kingdom, Portsmouth
University of Portsmouth
Liske, Jochen
Germany, Garching Bei Munchen
European Southern Observatory
Loveday, Jon N.
United Kingdom, Brighton
University of Sussex
Norberg, Peder R.
United Kingdom, Edinburgh
The University of Edinburgh
Peacock, John A.
United Kingdom, Edinburgh
The University of Edinburgh
Bamford, Steven P.
United Kingdom, Nottingham
University of Nottingham
Brough, Sarah
Australia
Australian Astronomical Observatory
Colless, Matthew
Australia
Australian Astronomical Observatory
Cameron, Ewan
Switzerland, Zurich
Eth Zürich
Conselice, Christopher J.
United Kingdom, Nottingham
University of Nottingham
Croom, Scott M.
Australia, Sydney
The University of Sydney
Frenk, Carlos S.
United Kingdom, Durham
Durham University
Gunawardhana, Madusha L.P.
Australia, Sydney
The University of Sydney
Kuijken, Konrad H.
Netherlands, Leiden
Universiteit Leiden
Nichol, Robert C.
United Kingdom, Portsmouth
University of Portsmouth
Parkinson, Hannah R.
United Kingdom, Edinburgh
The University of Edinburgh
Phillipps, Steven
United Kingdom, Bristol
University of Bristol
Pimbblet, Kevin A.
Australia, Clayton
Monash University
Popescu, Cristina C.
United Kingdom, Preston
University of Central Lancashire
Prescott, Matthew
United Kingdom, Liverpool
Liverpool John Moores University
Sutherland, William J.
United Kingdom, London
Queen Mary University of London
Tuffs, Richard J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
van Kampen, Eelco V.
Germany, Garching Bei Munchen
European Southern Observatory
Wijesinghe, Dinuka B.
Australia, Sydney
The University of Sydney
Statistics
Citations: 499
Authors: 35
Affiliations: 19
Identifiers
Doi:
10.1111/j.1365-2966.2011.19536.x
ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative