Calibrating Photometric Redshifts of Luminous Red Galaxies

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dc.creatorPadmanabhan, Nikhil
dc.creatorBudavari, Tamas
dc.creatorSchlegel, David J.
dc.creatorBridges, Terry
dc.creatorBrinkmann, Jonathan
dc.creatorCannon, Russell
dc.creatorConnolly, Andrew J.
dc.creatorCroom, Scott M.
dc.creatorCsabai, Istvan
dc.creatorDrinkwater, Michael
dc.creatorEisenstein, Daniel J.
dc.creatorHewett, Paul C.
dc.creatorLoveday, Jon
dc.creatorNichol, Robert C.
dc.creatorPimbblet, Kevin A.
dc.creatorDe Propris, Roberto
dc.creatorSchneider, Donald P.
dc.creatorScranton, Ryan
dc.creatorSeljak, Uros
dc.creatorShanks, Tom
dc.creatorSzapudi, Istvan
dc.creatorSzalay, Alexander S.
dc.creatorWake, David
dc.date2004-07-28
dc.date2005-05-24
dc.date.accessioned2026-07-07T10:27:16Z
dc.date.available2026-07-07T10:27:16Z
dc.descriptionWe discuss the construction of a photometric redshift catalogue of Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS), emphasizing the principal steps necessary for constructing such a catalogue -- (i) photometrically selecting the sample, (ii) measuring photometric redshifts and their error distributions, (iii) and estimating the true redshift distribution. We compare two photometric redshift algorithms for these data and find that they give comparable results. Calibrating against the SDSS and SDSS-2dF spectroscopic surveys, we find that the photometric redshift accuracy is $σ\sim 0.03$ for redshifts less than 0.55 and worsens at higher redshift ($\sim 0.06$). These errors are caused by photometric scatter, as well as systematic errors in the templates, filter curves, and photometric zeropoints. We also parametrize the photometric redshift error distribution with a sum of Gaussians, and use this model to deconvolve the errors from the measured photometric redshift distribution to estimate the true redshift distribution. We pay special attention to the stability of this deconvolution, regularizing the method with a prior on the smoothness of the true redshift distribution. The methods we develop are applicable to general photometric redshift surveys.
dc.description15 pages, 12 figs, matches version accepted by MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0407594
dc.identifierhttp://arxiv.org/abs/astro-ph/0407594
dc.identifierMon.Not.Roy.Astron.Soc.359:237-250,2005
dc.identifierdoi:10.1111/j.1365-2966.2005.08915.x/abs/
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177102
dc.subjectAstrophysics
dc.titleCalibrating Photometric Redshifts of Luminous Red Galaxies
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