MegaZ-LRG: A photometric redshift catalogue of one million SDSS Luminous Red Galaxies

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dc.creatorCollister, Adrian
dc.creatorLahav, Ofer
dc.creatorBlake, Chris
dc.creatorCannon, Russell
dc.creatorCroom, Scott
dc.creatorDrinkwater, Michael
dc.creatorEdge, Alastair
dc.creatorEisenstein, Daniel
dc.creatorLoveday, Jon
dc.creatorNichol, Robert
dc.creatorPimbblet, Kevin
dc.creatorDe Propris, Roberto
dc.creatorRoseboom, Isaac
dc.creatorRoss, Nic
dc.creatorSchneider, Donald P.
dc.creatorShanks, Tom
dc.creatorWake, David
dc.date2006-07-27
dc.date2006-11-19
dc.date.accessioned2026-07-07T11:25:49Z
dc.date.available2026-07-07T11:25:49Z
dc.descriptionWe 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 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 ANNz, a neural network-based photometric-redshift estimator. The rms photometric redshift accuracy obtained for an evaluation set selected from the 2SLAQ sample is sigma_z = 0.049 averaged over all galaxies, and sigma_z = 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 .
dc.description10 pages, 13 figures. Accepted by MNRAS. The MegaZ-LRG catalogue is available from http://www.2slaq.info
dc.identifierhttps://arxiv.org/abs/astro-ph/0607630
dc.identifierhttp://arxiv.org/abs/astro-ph/0607630
dc.identifierMon.Not.Roy.Astron.Soc.375:68-76,2007
dc.identifierdoi:10.1111/j.1365-2966.2006.11305.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195632
dc.subjectAstrophysics
dc.titleMegaZ-LRG: A photometric redshift catalogue of one million SDSS Luminous Red Galaxies
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