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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Galaxy and Mass Assembly: FUV, NUV, ugrizYJHK Petrosian, Kron and Sérsic photometry
Monthly Notices of the Royal Astronomical Society, Volume 412, No. 2, Year 2011
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Description
In order to generate credible 0.1-2μm spectral energy distributions, the Galaxy and Mass Assembly (GAMA) project requires many gigabytes of imaging data from a number of instruments to be reprocessed into a standard format. In this paper, we discuss the software infrastructure we use, and create self-consistent ugrizYJHK photometry for all sources within the GAMA sample. Using UKIDSS and SDSS archive data, we outline the pre-processing necessary to standardize all images to a common zero-point, the steps taken to correct for the seeing bias across the data set and the creation of gigapixel-scale mosaics of the three 4 × 12deg2 GAMA regions in each filter. From these mosaics, we extract source catalogues for the GAMA regions using elliptical Kron and Petrosian matched apertures. We also calculate Sérsic magnitudes for all galaxies within the GAMA sample using sigma, a galaxy component modelling wrapper for galfit 3. We compare the resultant photometry directly and also calculate the r-band galaxy luminosity function for all photometric data sets to highlight the uncertainty introduced by the photometric method. We find that (1) changing the object detection threshold has a minor effect on the best-fitting Schechter parameters of the overall population (M*plusmn; 0.055mag, α± 0.014, φ{symbol}*± 0.0005h3Mpc-3); (2) there is an offset between data sets that use Kron or Petrosian photometry, regardless of the filter; (3) the decision to use circular or elliptical apertures causes an offset in M* of 0.20mag; (4) the best-fitting Schechter parameters from total-magnitude photometric systems (such as SDSS modelmag or Sérsic magnitudes) have a steeper faint-end slope than photometric systems based upon Kron or Petrosian measurements; and (5) our Universe's total luminosity density, when calculated using Kron or Petrosian r-band photometry, is underestimated by at least 15 per cent. © 2010 The Authors Monthly Notices of the Royal Astronomical Society © 2010 RAS.
Authors & Co-Authors
Hill, David T.
United Kingdom, St Andrews
University of st Andrews
Kelvin, Lee S.
United Kingdom, St Andrews
University of st Andrews
Driver, Simon P.
United Kingdom, St Andrews
University of st Andrews
Robotham, Aaron S.G.
United Kingdom, St Andrews
University of st Andrews
Cameron, Ewan
United Kingdom, St Andrews
University of st Andrews
Switzerland, Zurich
Eth Zürich
Cross, Nicholas J.G.
United Kingdom, Edinburgh
The University of Edinburgh
Andrae, Ellen
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Baldry, Ivan K.
United Kingdom, Liverpool
Liverpool John Moores University
Bamford, Steven P.
United Kingdom, Nottingham
University of Nottingham
Bland-Hawthorn, Joss
Australia, Sydney
The University of Sydney
Brough, Sarah
Australia, Eastwood
Anglo Australian Observatory
Conselice, Christopher J.
United Kingdom, Nottingham
University of Nottingham
Dye, S.
United Kingdom, Cardiff
Cardiff University
Hopkins, Andrew M.
Australia, Eastwood
Anglo Australian Observatory
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
Croom, Scott M.
Australia, Sydney
The University of Sydney
Frenk, Carlos S.
United Kingdom, Durham
Durham University
Graham, Alister W.
Australia, Hawthorn
Swinburne University of Technology
Jones, Daniel Heath
Australia, Eastwood
Anglo Australian Observatory
Kuijken, Konrad H.
Netherlands, Leiden
Universiteit Leiden
Madore, Barry F.
United States, Pasadena
Carnegie Observatories
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
Seibert, Mark
United States, Pasadena
Carnegie Observatories
Sharp, Rob G.
Australia, Eastwood
Anglo Australian Observatory
Sutherland, William J.
United Kingdom, London
Queen Mary University of London
Thomas, Daniel B.
United Kingdom, Portsmouth
University of Portsmouth
Tuffs, Richard J.
Germany, Heidelberg
Max-planck-institut Für Kernphysik
van Kampen, Eelco V.
Germany, Garching Bei Munchen
European Southern Observatory
Statistics
Citations: 126
Authors: 36
Affiliations: 20
Identifiers
Doi:
10.1111/j.1365-2966.2010.17950.x
ISSN:
00358711
Study Design
Cross Sectional Study