Quasar Candidate Multicolor Selection Technique: a different approach

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dc.creatorHatziminaoglou, E.
dc.creatorMathez, G.
dc.creatorPello, R.
dc.date2000-01-31
dc.date2000-05-03
dc.date.accessioned2026-07-07T01:51:59Z
dc.date.available2026-07-07T01:51:59Z
dc.descriptionWe present a quasar candidate identification technique based on multicolor photometry. The traditional multi-dimensional method (2 $\times$ N dimensions, where N is the number of the color-color diagrams) is reduced to a one-dimensional technique, which consists in a standard fitting procedure, where the observed spectral energy distributions are compared to quasar simulated spectra and stellar templates. This new multicolor approach is firstly applied to simulated catalogues and its {\it efficiency} is examined in various redshift ranges, as a function of the filter combination and the available observing time for spectroscopy. We conclude that this method is better suited than the usual multicolor selection techniques to quasar identification, especially for high-redshift quasars. The application of the method to real quasar samples found in the literature results in an {\it efficiency} comparable to the one obtained from the use of color-color diagrams. The major advantage of the new method is the estimation of the {\it photometric} redshift of quasar candidates, enabling, in almost all cases, spectroscopy to be targeted to best suited wavelength ranges.
dc.description10 pages, 11 figures, replaced with revised version, accepted for publication in Astron. Astroph
dc.identifierhttps://arxiv.org/abs/astro-ph/0001538
dc.identifierhttp://arxiv.org/abs/astro-ph/0001538
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/477
dc.subjectAstrophysics
dc.titleQuasar Candidate Multicolor Selection Technique: a different approach
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