SDSS J154459.19-002659.5 , the SIMBAD biblio

2007MNRAS.375...68C - Mon. Not. R. Astron. Soc., 375, 68-76 (2007/February-2)

MegaZ-LRG: a photometric redshift catalogue of one million SDSS luminous red galaxies.

COLLISTER A., LAHAV O., BLAKE C., CANNON R., CROOM S., DRINKWATER M., EDGE A., EISENSTEIN D., LOVEDAY J., NICHOL R., PIMBBLET K., DE PROPRIS R., ROSEBOOM I., ROSS N., SCHNEIDER D.P., SHANKS T. and WAKE D.

Abstract (from CDS):

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 13000 intermediate-redshift LRGs provides a photometric redshift training set, allowing use of annz, a neural network-based photometric-redshift estimator. The rms photometric redshift accuracy obtained for an evaluation set selected from the 2SLAQ sample is σz= 0.049 averaged over all galaxies, and σz= 0.040 for a brighter subsample (i < 19.0). The catalogue is expected to contain ∼5 per cent stellar contamination. The annz code is used to compute a refined star/galaxy probability based on a range of photometric parameters; this allows the contamination fraction to be reduced to 2 per cent with negligible loss of genuine galaxies. The MegaZ-LRG catalogue is publicly available on the World Wide Web from http://www.2slaq.info.

Abstract Copyright: 2007 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): catalogues - surveys - galaxies: distances and redshifts - cosmology: observations

VizieR on-line data: <Available at CDS (J/MNRAS/375/68): catalog.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 6

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2021.09.17-05:48:40

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