Summary: From Z-Machines to ALMA: (Sub)millimeter Spectroscopy of Galaxies
ASP Conference Series, Vol. TBD, 2006
A. J. Baker, J. Glenn, A. I. Harris, J. G. Mangum, and M. S. Yun, eds.
Radio-mm-FIR Photometric Redshifts for (sub-)mm
Itziar Aretxaga1, David H. Hughes1, James S. Dunlop2
1Instituto Nacional de Astrof´isica, ´Optica y Electr´onica
Aptdo. Postal 51 y 216, 72000 Puebla, Mexico.
2Institute for Astronomy, University of Edinburgh, Royal Observatory,
Edinburgh, EH9 3HJ, UK.
Abstract. We present a comparison between the published optical, IR and
CO spectroscopic redshifts of 86 (sub-)mm galaxies and their photometric red-
shifts as derived from long-wavelength (radiommFIR) photometric data. The
redshift accuracy measured for 13 sub-mm galaxies with at least one robustly-
determined colour in the radiommFIR regime and additional constraining up-
per limits is z 0.30. This accuracy degrades to z 0.65 when only
the 1.4GHz/850µm spectral index is used, as derived from the analysis of a sub-
sample of 58 galaxies with robustly determined redshifts. Despite the wide range
of spectral energy distributions in the local galaxies that are used in an un-biased
manner as templates, this analysis demonstrates that photometric redshifts can