J/A+A/363/517ivo://CDS.VizieR/J/A+A/363/517doi:10.26093/cds/vizier.33630517CDSMobasher B.Mazzei P.2000-12-09T21:20:49Z2000-12-09T22:20:20ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesphotometryinfrared-photometryvisible-astronomybroad-band-photometryredshiftedA new method is developed for estimating photometric redshifts, using realistic template Spectral Energy Distributions (SEDs), extending over four decades in wavelength (i.e. from 0.05{mu}m to 1mm). The template SEDs are constructed for four different spectral types of galaxies (elliptical, spiral, irregular and starburst), satisfying the following characteristics: a) they are normalised to produce the observed colours of galaxies at z~0; b) incorporate the chemo-photometric spectral evolution of galaxies of different types, in agreement with the observations; c) allow treatment of dust contribution and its evolution with redshift, consistent with the spectral evolution models; d) include absorption and re-emission of radiation by dust and hence, realistic estimates of the far-infrared radiation; e) include correction for inter-galactic absorption by Lyman continuum and Lyman forest. Using these template SEDs, the photometric redshifts are estimated to an accuracy of {Delta}z=0.11. The simultaneous and self-consistent modelling of both the photometric and chemical evolution of galaxies and the effect of dust, makes this technique particularly useful for high redshift galaxies. The effects on the estimated photometric redshifts, due to assumptions in the evolutionary population synthesis models, are investigated and discussed. Also, the degeneracy in the predicted photometric redshifts and spectral types are examined, using a simulated galaxy catalogue.2000A&A...363..517Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/363/517CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/513/34 : HDF photometric redshifts catalog (Fernandez-Soto+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/363/517https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/363/517http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/363/517https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/363/517https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/363/517http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/363/517GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/363/517/table1 (The calibrating sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/363/517/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/363/517/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/363/517/table1?GETtext/xml+votable180.050000true189.192166762.19538330.0055555555555555566/11252https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/363/517?format=asciiOpticalInfrareddefaultJ/A+A/363/517/table1The calibrating samplen_NameIndividual notes (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameHDF designationmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainImagI-band aperture magnitude in AB systemmagphot.mag;em.opt.IfloatRmagR-band aperture magnitude in AB systemmagphot.mag;em.opt.RfloatBmagB-band aperture magnitude in AB systemmagphot.mag;em.opt.BfloatUmagU-band aperture magnitude in AB systemmagphot.mag;em.UVfloatzspectSpectral redshiftsrc.redshiftfloatzphotPhotometric redshiftsrc.redshiftfloat