Open AccessI mp Z: a new photometric redshift code for galaxies and quasars
Author(s) -
Babbedge T. S. R.,
RowanRobinson M.,
GonzalezSolares E.,
Polletta M.,
Berta S.,
PérezFour I.,
Oliver S.,
Salaman D. M.,
Irwin M.,
Weatherley S. J.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.08105.x
Subject(s) - physics , quasar , astrophysics , redshift , galaxy , photometric redshift , red shift , astronomy , galaxy formation and evolution
We present a combined galaxy–quasar approach to template‐fitting photometric redshift techniques and show the method to be a powerful one. The code (I mp Z) 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 Δ 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 Δ 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.