|
|||||
|
|
MegaZ-LRG: a photometric redshift catalogue of one million SDSS luminous red galaxies |
|
| Authors: | Adrian Collister Ofer Lahav Chris Blake Russell Cannon Scott Croom Michael Drinkwater Alastair Edge Daniel Eisenstein Jon Loveday Robert Nichol Kevin Pimbblet Roberto De Propris Isaac Roseboom Nic Ross Donald P Schneider Tom Shanks David Wake |
| Institution: | Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA;Department of Physics &Astronomy, University College London, Gower Street, London WC1E 6BT;Department of Physics &Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada;Centre for Astrophysics &Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia;Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia;Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia;Department of Physics, University of Durham, South Road, Durham DH1 3LE;Steward Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721, USA;Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QJ;Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 2EG;Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile;Department of Astronomy &Astrophysics, The Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA |
| Abstract: | We describe the construction of MegaZ-LRG, a photometric redshift catalogue of over one million luminous red galaxies (LRGs) in the redshift range 0.4 < z < 0.7 with limiting magnitude i < 20 . The catalogue is selected from the imaging data of the Sloan Digital Sky Survey (SDSS) Data Release 4. The 2dF-SDSS LRG and Quasar (2SLAQ) spectroscopic redshift catalogue of 13 000 intermediate-redshift LRGs provides a photometric redshift training set, allowing use of ann z, a neural network-based photometric-redshift estimator. The rms photometric redshift accuracy obtained for an evaluation set selected from the 2SLAQ sample is σ |
| Keywords: | catalogues surveys galaxies: distances and redshifts cosmology: observations |