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Identification and properties of host galaxies of RCR radio sources

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Abstract

FIRST and NVSS radio maps are used to cross identify the radio sources of the RCR catalog, which is based on observational data obtained in several runs of the “Cold” survey, with the SDSS and DPOSS digital optical sky surveys and the 2MASS, LAS UKIDSS, and WISE infrared surveys. Digital images in various filters and the coadded gri-band SDSS images, red and infrared DPOSS images, JHK-band UKIDSS images, and JHK-band 2MASS images are analyzed for the sources with no optical candidates found in the above catalogs. Our choice of optical candidates was based on the data on the structure of the radio source, its photometry, and spectroscopy (where available). We found reliable identifications for 86% of the radio sources; possible counterparts for 8% of the sources, and failed to find any optical counterparts for 6% of the sources because their host objects proved to be fainter than the limiting magnitude of the corresponding surveys. A little over half of all the identifications proved to be galaxies; about one quarter were quasars, and the types of the remaining objects were difficult to determine because of their faintness. A relation between the luminosity and the radioloudness index was derived and used to estimate the 1.4 and 3.94 GHz luminosities for the sources with unknown redshifts. We found 3% and 60% of all the RCR radio sources to be FRI-type objects (L ≲ 1024 W/Hz at 1.4 GHz) and powerful FRII-type galaxies (L ≳ 1026.5 W/Hz), respectively, whereas the rest are sources including objects of the FRI, FRII, and mixed FRI-FRII types. Unlike quasars, galaxies show a trend of decreasing luminosity with decreasing flux density. Note that identification would be quite problematic without the software and resources of the virtual observatory.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 369167, Russia

    O. P. Zhelenkova & E. K. Majorova

  2. St. Petersburg Branch, Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg, 196140, Russia

    N. S. Soboleva & A. V. Temirova

Authors
  1. O. P. Zhelenkova
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  2. N. S. Soboleva
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  3. E. K. Majorova
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  4. A. V. Temirova
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Original Russian Text © O.P. Zhelenkova, N.S. Soboleva, E.K. Majorova, A.V. Temirova, 2013, published in Astrofizicheskii Byulleten, 2013, Vol. 68, No. 1, pp. 27–41.

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Zhelenkova, O.P., Soboleva, N.S., Majorova, E.K. et al. Identification and properties of host galaxies of RCR radio sources. Astrophys. Bull. 68, 26–39 (2013). https://doi.org/10.1134/S1990341313010033

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  • DOI: https://doi.org/10.1134/S1990341313010033

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