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IMPZ: a new photometric redshift code for galaxies and quasars

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posted on 2023-06-08, 06:43 authored by T S R Babbedge, M Rowan-Robinson, E Gonzáles-Solares, M Polletta, S Berta, I Pérez-Fournon, Seb OliverSeb Oliver, D M Salaman, M Irwin, S J Weatherley
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 ?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 ?z/(1 +z) constrained to within 0.25 for 68 per cent of the quasars in our sample. Various template extensions into the far-ultraviolet are also tested.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Issue

2

Volume

353

Page range

654-672

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2016-11-16

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