The evolution of submillimetre galaxies: Two populations and a redshift cut-off

Feb, 2007
8 pages
Published in:
  • Mon.Not.Roy.Astron.Soc. 383 (2008) 435
e-Print:

Citations per year

200720112015201920210246810
Abstract: (arXiv)
We explore the epoch dependence of number density and star-formation rate for submm galaxies found at 850 um. The study uses a sample of 38 submm galaxies in the GOODS-N field, for which cross-waveband identifications have been obtained for 35/38 members together with redshift measurements or estimates. A maximum-likelihood analysis is employed, along with the `single-source-survey' technique. We find a highly significant diminution in both space density and star formation rate at z > 3, closely mimicking the redshift cut-offs found for QSOs selected in different wavebands. The data further indicate that two separately-evolving populations are present, with distinct luminosity functions. These results parallel the different evolutionary behaviours of LIRGs and ULIRGs, and represent another instance of `cosmic down-sizing'.
Note:
  • 8 pages, 12 figures, MNRAS submitted
  • GALAXIES STARBURST
  • GALAXIES EVOLUTION
  • GALAXIES LUMINOSITY FUNCTION
  • METHODS STATISTICAL