The SCUBA 8-mJy survey - II: Multiwavelength analysis of bright sub-mm sources

Details The SCUBA 8-mJy survey - II: Multiwavelength analysis of bright sub-mm sources The SCUBA 8-mJy survey - II: Multiwavelength analysis of bright sub-mm sources

2001-07-31

arxiv.org/abs/astro-ph/0107585v3

Mon.Not.Roy.Astron.Soc. 331 (2002) 839

Astronomy and Astrophysics

Astrophysics

14 pages (including 30 figures and 4 tables) accepted by MNRAS. Figure 1 and 2 and a higher quality version of the full paper

Scientific paper

10.1046/j.1365-8711.2002.05111.x

We present the results of a multi-wavelength study of the 19 most significant sub-mm sources detected in the SCUBA 8-mJy survey. As described in Scott et al. (2001), this survey covers ~260 arcmin^2 using the sub-millimetre camera SCUBA, to a limiting source detection limit S(850um) ~ 8 mJy. One advantage of this relatively bright flux-density limit is that accurate astrometric positions are potentially achievable for every source using existing radio and/or mm-wave interferometers. However, an associated advantage is that SED-based redshift constraints should be more powerful than in fainter sub-mm surveys. Here we therefore exploit the parallel SCUBA 450um data, in combination with existing radio and ISO data at longer and shorter wavelengths to set constraints on the redshift of each source. We also analyse new and existing optical and near-infrared imaging of our SCUBA survey fields to select potential identifications consistent with these constraints. Our derived SED-based redshift constraints, and the lack of statistically significant associations with even moderately bright galaxies allow us to conclude that all 19 sources lie at z > 1, and at least half of them apparently lie at z > 2.

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