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The TOOT survey: status and early results

New Astronomy Reviews
Publication Date
DOI: 10.1016/s1387-6473(03)00048-4
  • Galaxies: Active
  • Radio Continuum: Galaxies
  • Galaxies: Surveys: Toot
  • Design


Abstract The TexOx-1000 (TOOT) radio source redshift survey is designed to find and study typical radio-loud active galaxies to high redshift. They are typical in the same sense that L∗ galaxies are typical of galaxies in the optical. Previous surveys have only included the most luminous, rare objects at and beyond the peak of activity at z∼2, but in going a factor of 100 fainter than the 3C survey, and in assembling a large sample, TOOT probes for the first time the objects that dominate the radio luminosity density of the universe at high redshift. Here we describe the current status of the TOOT survey and draw preliminary conclusions about the redshift distribution of the radio sources. So far, ∼520 of the 1000 radio sources have redshifts, with ∼440 of those in well-defined, complete, sub-regions of the survey. For these we find a median redshift of z=1, but the measured redshift distribution has a deficit of objects with z∼2, when compared to predictions based on extrapolating luminosity functions constrained by higher-flux-density samples. These are the more luminous objects that usually show emission lines, and which should not be missed in the survey unless they are heavily reddened. The deficit may be real, but it would not be too surprising to find a population of faint, reddened radio sources at z∼2–3 among the TOOT sources yet to have accurate redshifts.

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