Searches for high redshift radio galaxies

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We have started a search for High Redshift Radio Galaxies (HzRGs) in an area covering 7 sr by selecting a sample of Ultra Steep Spectrum (USS) sources with a low flux density cut-off S{sub 1400} > 10 mJy and a steep spectral index {alpha} < -1 3 (S {alpha} {nu}{sup {alpha}}) using the WENSS, NVSS and TEXAS radio suveys. Preliminary results for 25 sources shows that we are almost twice as effective in finding HzRGs than previous searches using brighter radio sources and less steep radio spectra ({alpha} < -1 0) The redshift distribution is consistent with an extension of ... continued below

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11 p.

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De Breuck, C., LLNL January 23, 1998.

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We have started a search for High Redshift Radio Galaxies (HzRGs) in an area covering 7 sr by selecting a sample of Ultra Steep Spectrum (USS) sources with a low flux density cut-off S{sub 1400} > 10 mJy and a steep spectral index {alpha} < -1 3 (S {alpha} {nu}{sup {alpha}}) using the WENSS, NVSS and TEXAS radio suveys. Preliminary results for 25 sources shows that we are almost twice as effective in finding HzRGs than previous searches using brighter radio sources and less steep radio spectra ({alpha} < -1 0) The redshift distribution is consistent with an extension of the z - {alpha} relation to {alpha} < -1 3, but a large fraction of our sample (40%) consists of objects which are too faint to observe with 3-4m class telescopes The first results from our Keck K- band imaging and spectroscopy program indicate that these faint objects are our best candidates to detect HzRGs at z > 3 5 Our search is aired at significantly increasing the number of very high redshift radio galaxies for further detailed studies of the formation and evolution of massive galaxies and their environment

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11 p.

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OSTI as DE98058839

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  • The most distant radio galaxies, Amsterdam (Netherlands), 15-17 Oct 1997

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  • Other: DE98058839
  • Report No.: UCRL-JC--127348-Rev.1
  • Report No.: CONF-9710258--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 292196
  • Archival Resource Key: ark:/67531/metadc678944

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  • January 23, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 8, 2017, 12:46 p.m.

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De Breuck, C., LLNL. Searches for high redshift radio galaxies, article, January 23, 1998; California. (digital.library.unt.edu/ark:/67531/metadc678944/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.