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arxiv: 1505.01003 · v1 · pith:KP4A7QJA · submitted 2015-05-05 · astro-ph.GA

Galaxy and Mass Assembly (GAMA): maximum likelihood determination of the luminosity function and its evolution

J. Loveday , P. Norberg , I.K. Baldry , J. Bland-Hawthorn , S. Brough , M.J.I. Brown , S.P. Driver , L.S. Kelvin
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S. Phillipps
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classification astro-ph.GA
keywords evolutionluminositydensitygalaxiespetrosianbluefunctiongalaxy
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We describe modifications to the joint stepwise maximum likelihood method of Cole (2011) in order to simultaneously fit the GAMA-II galaxy luminosity function (LF), corrected for radial density variations, and its evolution with redshift. The whole sample is reasonably well-fit with luminosity (Qe) and density (Pe) evolution parameters Qe, Pe = 1.0, 1.0 but with significant degeneracies characterized by Qe = 1.4 - 0.4Pe. Blue galaxies exhibit larger luminosity density evolution than red galaxies, as expected. We present the evolution-corrected r-band LF for the whole sample and for blue and red sub-samples, using both Petrosian and Sersic magnitudes. Petrosian magnitudes miss a substantial fraction of the flux of de Vaucouleurs profile galaxies: the Sersic LF is substantially higher than the Petrosian LF at the bright end.

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