RC J0311+0507: A candidate for superpowerful radio galaxies in the early universe at redshift z = 4.514 |
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| Authors: | A I Kopylov W M Goss Yu N Pariĭskiĭ N S Soboleva O V Verkhodanov A V Temirova O P Zhelenkova |
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| Institution: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhniĭ Arkhyz, Karachaevo-Cherkessian Republic, 369167, Russia;(2) National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA;(3) St. Petersburg Branch of the Special Astrophysical Observatory, Russian Academy of Sciences, Pulkovo, St. Petersburg, 196140, Russia |
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| Abstract: | A strong emission line at 6703 Å has been detected in the optical spectrum for the host galaxy (R = 23.1) of the radio source RC J0311+0507 (4C+04.11). This radio galaxy, with a spectral index of 1.31 in the frequency range 365–4850 MHz, is one of the ultrasteep-spectrum objects from the deep survey of a sky strip conducted with RATAN-600 in 1980–1981. We present arguments in favor of the identification of this line with Lyα at redshift z = 4.514. In this case, the object belongs to the group of extremely distant radio galaxies of ultrahigh radio luminosity (P 1400 = 1.3 × 1029 W Hz?1). Such power can be provided only by a fairly massive black hole (～109 M⊙) that formed in a time less than the age of the Universe at the observed z (1.3 Gyr) or had a primordial origin. |
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