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A Self-consistent Method for Estimating Photometric Redshifts | | B. Mobasher
; P. Mazzei
; | | Date: |
15 Jul 1999 | | Subject: | astro-ph | | Affiliation: | Imperial College) and P. Mazzei (University of Padova | | Abstract: | A new method is developed for estimating photometric redshifts, using realistic template SEDs, extending over four decades in wavelength (i.e from 0.05 $mu m$ to 1 mm). The SEDs are constructed for four different spectral types of galaxies (elliptical, spiral, irregular and starburst) and satisfy the following characteristics: a). they are optimised to produce the observed colours of galaxies at $zsim 0$; b). incorporate the chemo-photometric spectral evolution of galaxies of different types, in agreement with observations; c). allow treatment of dust contribution and its evolution with redshift, consistent with the spectral evolution model; 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 degeneracy in the method and hence, the redshifts and spectral types, are explored via Monte Carlo simulations. The consistency of the technique is demonstrated by applying it on a UV selected sample of HDF galaxies and comparing the statistical results with those from other independent studies. | | Source: | arXiv, astro-ph/9907210 | | Services: | Forum | Review | PDF | Favorites | |
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