Bivariate galaxy luminosity functions in the Sloan Digital Sky Survey

Loveday, J., Ball, N. M., Brunner, R. J., Baldry, I. K. and Brinkmann, J. (2006) Bivariate galaxy luminosity functions in the Sloan Digital Sky Survey. Monthly Notices of the Royal Astronomical Society, 373 (2). pp. 845-868. ISSN 0035-8711

[img] PDF
Restricted to SRO admin only

Download (1MB)

Abstract

Bivariate luminosity functions (LFs) are computed for galaxies in the New York Value-Added Galaxy Catalogue, based on the Sloan Digital Sky Survey Data Release 4. The galaxy properties investigated are the morphological type, inverse concentration index, Sérsic index, absolute effective surface brightness (SB), reference frame colours, absolute radius, eClass spectral type, stellar mass and galaxy environment. The morphological sample is flux limited to galaxies with r < 15.9 and consists of 37 047 classifications to an rms accuracy of ± half a class in the sequence E, S0, Sa, Sb, Sc, Sd, Im. These were assigned by an artificial neural network, based on a training set of 645 eyeball classifications. The other samples use r < 17.77 with a median redshift of z 0.08, and a limiting redshift of z < 0.15 to minimize the effects of evolution. Other cuts, for example in axis ratio, are made to minimize biases. A wealth of detail is seen, with clear variations between the LFs according to absolute magnitude and the second parameter. They are consistent with an early-type, bright, concentrated, red population and a late-type, faint, less concentrated, blue, star-forming population. This bimodality suggests two major underlying physical processes, which in agreement with previous authors we hypothesize to be merger and accretion, associated with the properties of bulges and discs, respectively. The bivariate luminosity–SB distribution is fit with the Chołoniewski function (a Schechter function in absolute magnitude and Gaussian in SB). The fit is found to be poor, as might be expected if there are two underlying processes.

Item Type: Article
Additional Information: The definitive version is available at www.blackwell-synergy.com
Keywords: methods: data analysis – methods: statistical – galaxies: fundamental parameters – galaxies: luminosity function, mass function – galaxies: statistics – cosmology: observations.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Gemma Farrell
Date Deposited: 14 Mar 2008
Last Modified: 13 Mar 2017 12:06
URI: http://sro.sussex.ac.uk/id/eprint/1705
Google Scholar:37 Citations

View download statistics for this item

📧 Request an update