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

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 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 .

arXiv comment10 pages, 13 figures. Accepted by MNRAS. The MegaZ-LRG catalogue is available from http://www.2slaq.info

References in corpus (16)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Sloan Digital Sky Survey: Technical Summary
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• The Sloan Digital Sky Survey Photometric Camera
• The u'g'r'i'z' Standard Star Network
• Bayesian photometric redshift estimation
• The Fourth Data Release of the Sloan Digital Sky Survey
• Spectroscopic Target Selection for the Sloan Digital Sky Survey: The Luminous Red Galaxy Sample
• Astrometric Calibration of the Sloan Digital Sky Survey
• ANNz: estimating photometric redshifts using artificial neural networks
• Slicing Through Multicolor Space: Galaxy Redshifts From Broadband Photometry
• Photometric Redshifts for the SDSS Early Data Release
• Estimating photometric redshifts with artificial neural networks
• The 2dF-SDSS LRG and QSO (2SLAQ) Luminous Red Galaxy Survey
• Average spectra of massive galaxies in the SDSS

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• Robust Machine Learning Applied to Astronomical Datasets III: Probabilistic Photometric Redshifts for Galaxies and Quasars in the SDSS and GALEX
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• Intrinsic galaxy shapes and alignments II: Modelling the intrinsic alignment contamination of weak lensing surveys
• New Neutrino Mass Bounds from Sloan Digital Sky Survey III Data Release 8 Photometric Luminous Galaxies
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• PS1-STRM: Neural network source classification and photometric redshift catalogue for PS1 $3\pi$ DR1
• The incidence of cool gas in ~ 1e13 Msun halos
• Redshift and luminosity evolution of the intrinsic alignments of galaxies in Horizon-AGN
• Robust Machine Learning Applied to Astronomical Datasets II: Quantifying Photometric Redshifts for Quasars Using Instance-Based Learning
• Inferring the Redshift Distribution of the Cosmic Infrared Background
• The Accretion of Gas onto Galaxies as Traced by their Satellites
• A cross-correlation study of the Fermi-LAT $\gamma$-ray diffuse extragalactic signal
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• Galaxy morphoto-Z with neural Networks (GaZNets). I. Optimized accuracy and outlier fraction from Imaging and Photometry
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• Dark Energy Detected with Supervoids and Superclusters
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• Faint, Evolving Radio AGN in SDSS Luminous Red Galaxies
• Of Genes and Machines: application of a combination of machine learning tools to astronomy datasets
• The Integrated Sachs-Wolfe Effect in Time Varying Vacuum Model
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• Cosmological forecasts from photometric measurements of the angular correlation function
• Photo-z Quality Cuts and their Effect on the Measured Galaxy Clustering
• Perturbation level interacting dark energy model and its consequence on late-time cosmological parameters
• Giga-z: A 100,000 Object Superconducting Spectrophotometer for LSST Follow-up
• The XXL Survey. XLI. Radio AGN luminosity functions based on the GMRT $610\mathrm{MHz}$ continuum observations
• Reconstructing galaxy fundamental distributions and scaling relations from photometric redshift surveys. Applications to the SDSS early-type sample
• Machine learning applications in astrophysics: Photometric redshift estimation
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• Particle Physics in the Sky and Astrophysics Underground: Connecting the Universe's Largest and Smallest Scales
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