Observational constraints on the physical nature of submillimetre source multiplicity: chance projections are common Academic Article uri icon


  • Abstract: Interferometric observations have demonstrated that a significant fraction of single- dish submillimetre (submm) sources are blends of multiple submm galaxies (SMGs), but the nature of this multiplicity, ie whether the galaxies are physically associated or chance projections, has not been determined. We performed spectroscopy of 11 SMGs in six multi- component submm sources, obtaining spectroscopic redshifts for nine of them. For an additional two component SMGs, we detected continuum emission but no obvious features. We supplement our observed sources with four sources from the literature. This sample allows us to statistically constrain the physical nature of single-dish submm source multiplicity for the first time. In three [3/7, or 43 (-33/+ 39) per cent at 95% confidence] of the single-dish sources for which the nature of the blending is unambiguous, the components …

publication date

  • February 9, 2018