A single population scheme for FR I and FR II radio sources

I Snellen, P Best

Research output: Contribution to journalArticlepeer-review

Abstract

The presence of two distant FR I radio galaxies in the Hubble Deep Field plus Flanking Fields indicates that the number density of these objects is about 10-50 times higher at z > 1 than in the local universe. This is in strong contrast with the idea that FR Is undergo no cosmological evolution. We advocate that the cosmological evolution of radio sources may be independent of FR class, and instead solely a function of radio power. In this scenario the evolutionary properties of extragalactic radio sources can be fully described within a 'single population scheme'. (C) 2003 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)225-229
Number of pages5
JournalNew Astronomy Reviews
Volume47
Issue number4-5
DOIs
Publication statusPublished - Sep 2003

Keywords

  • surveys
  • galaxies : active
  • radio continuum : galaxies
  • HUBBLE DEEP FIELD
  • LUMINOSITY FUNCTION
  • COSMOLOGICAL EVOLUTION
  • REDSHIFT CUTOFF
  • BLACK-HOLES
  • GALAXIES
  • EMISSION
  • UNIFICATION
  • PHOTOMETRY
  • QUASARS

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