2000/02/29 by L. Dunne, D. L. Clements, S. Eales +1 · 2 citations
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Luminosity #Physics #Population #Radio Astronomy Observations and Technology #Radio galaxy #Redshift #Spectral index #Spectral line #Star formation #Universe #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2000.03882.x
published as Mon.Not.Roy.Astron.Soc. 319 (2000) 813 · 8 pages including 7 figures, accepted for publication in MNRAS. Substantial extra content to original version, investigation into temperature and luminosity dependencies and addition of new high-z data points
arxiv created 2000/07/19 · openalex publication_date 2002/04/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Many of the faint submm sources uncovered by deep SCUBA surveys still remain unidentified at most, if not all, other wavelengths. The most successful method so far of obtaining accurate positions and hence allowing more secure identifications has been to use centimetre-wavelength imaging with the VLA. This has led to a tempting approach for obtaining redshift estimates for this population by Carilli & Yun, which relies on the tight FIR-radio relationship and takes advantage of the steep spectral slope in the submm. In this paper we use the submm data from the SCUBA Local Universe Galaxy Survey (SLUGS) to estimate the usefulness of, and the uncertainties in, the radio-submm redshift estimator. If the submm-radio spectral index were correlated with either dust temperature or 850-μm luminosity, this method could produce biased redshift estimates for 850-μm selected galaxies. We find, however, that within SLUGS, these correlations are not significant. The ratio of 850-μm to 1.4-GHz flux is found to decrease with increasing radio and FIR luminosity, and we propose that this is due to a component of the dust not associated with recent star formation, but which is instead heated to 15–20 K by the general interstellar radiation field.