ImpZ: a new photometric redshift code for galaxies and quasars

Details ImpZ: a new photometric redshift code for galaxies and quasars ImpZ: a new photometric redshift code for galaxies and quasars

2004-06-11

arxiv.org/abs/astro-ph/0406296v3

Mon.Not.Roy.Astron.Soc. 353 (2004) 654-672

Astronomy and Astrophysics

Astrophysics

21 pages. MNRAS in press. Minor alterations to match MNRAS final proof

Scientific paper

10.1111/j.1365-2966.2004.08105.x

We present a combined galaxy-quasar approach to template-fitting photometric redshift techniques and show the method to be a powerful one. The code (ImpZ) is presented, developed and applied to two spectroscopic redshift catalogues, namely the Isaac Newton Telescope Wide Angle Survey ELAIS N1 and N2 fields and the Chandra Deep Field North. In particular, optical size information is used to improve the redshift determination. The success of the code is shown to be very good with Delta z/(1+z) constrained to within 0.1 for 92 per cent of the galaxies in our sample. The extension of template-fitting to quasars is found to be reasonable with Delta z/(1+z) constrained to within 0.25 for 68 per cent of the quasars in our sample. Various template extensions into the far-UV are also tested.

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