High Redshift Radio Galaxies from the MG 5 GHz Radio Source Catalog

Details High Redshift Radio Galaxies from the MG 5 GHz Radio Source Catalog High Redshift Radio Galaxies from the MG 5 GHz Radio Source Catalog

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4102s&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #41.02; Bulletin of the American Astronomical Society, Vol. 24, p.1183

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Scientific paper

We present a progress report on optical identifications and spectroscopy from our survey of a sample of objects selected from the first MIT/Greenbank (MG) catalogue of radio sources (Bennett et al. 1986). Our subset consists of small angular size sources with classic double or triple radio morphologies as seen in VLA ``snapshots'' and moderate to steep spectral indices (alpha > 0.7). The 218 MG sources in our subsample have typical flux densities approximately 1/5 those of 3CR objects. With the MG survey, we sample fainter portions of the AGN radio luminosity function, and probe to higher redshifts (and thus earlier epochs of AGN history). We will discuss the implications of the sample for constraining the radio luminosity function at z > 2. The median redshift for the 45 galaxies and 9 quasars we have observed optically is = 1.2. At least 10 more faint and presumably very distant galaxies still lack reliable redshifts. We will illustrate with several examples, typical and extraordinary, from the sample. We find a new, minority population of galaxies with moderate redshifts and steep radio spectra that have optical and radio luminosities substantially lower than typical objects from the 3CR catalog. We will present results for the most distant galaxy to date in the sample (z=3.594), and narrow band imaging of extended Ly alpha , C IV, and C III] emission in another remarkable galaxy at z=2.281.

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