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Title:
Radio-mm-FIR Photometric Redshifts for (Sub-)mm Galaxies
Authors:
Aretxaga, I.; Hughes, D. H.; Dunlop, J. S.
Publication:
From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies ASP Conference Series, Vol. 375, proceedings of the conference held 12-14 January, 2006 at the North American ALMA Science Center, National Radio Astronomy Observatory, Charlottesville, Virginia, United States. Edited by Andrew J. Baker, Jason Glenn, Andrew I. Harris, Jeffrey G. Mangum and Min S. Yun., p.140
Publication Date:
10/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..375..140A

Abstract

We present a comparison between the published optical, IR, and CO spectroscopic redshifts of 86 (sub-)mm galaxies and their photometric redshifts as derived from long-wavelength (radio-mm-FIR) photometric data. The redshift accuracy measured for 13 sub-mm galaxies with at least one robustly determined color in the radio-mm-FIR regime and additional constraining upper limits is Δ z ≈ 0.30. This accuracy degrades to Δ z ≈ 0.65 when only the 1.4 GHz/850 μm 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 unbiased manner as templates, this analysis demonstrates that photometric redshifts can be efficiently derived for sub-mm galaxies with a precision of Δ z < 0.5 using only the rest-frame FIR to radio wavelength data, sufficient to guide the tuning of broad-band heterodyne observations (e.g., 100 m GBT, 50 m LMT, ALMA) or aid redshift determination in the case of a single line detection by these experiments.
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