SIMBAD references

2008MNRAS.383..435W - Mon. Not. R. Astron. Soc., 383, 435-444 (2008/January-2)

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


Abstract (from CDS):

We explore the epoch dependence of number density and star formation rate for submillimetre galaxies (SMGs) found at 850µm. The study uses a sample of 38 SMG in the Great Observatories Origins Deep Survey (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 diminution in both space-density and star formation rate at z > 3, closely mimicking the redshift cut-offs found for quasi-stellar objects (QSOs) selected in different wavebands. The diminution in redshift is particularly marked at a significance level too small to measure. The data further suggest, at a significance level of about 0.001, that two separately evolving populations may be present, with distinct luminosity functions. These results parallel the different evolutionary behaviours of Luminous Infrared Galaxies and Ultra-Luminous Infrared Galaxies, and represent another manifestation of `cosmic down-sizing', suggesting that differential evolution extends to the most extreme star-forming galaxies.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): methods: statistical - galaxies: evolution - galaxies: luminosity function, mass function - galaxies: starburst - submillimetre

Nomenclature: Table A1: [PBS2005] AANN (Nos GN39-GN41) added.

Simbad objects: 6

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