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MERLIN & EVN Observations of a z=4.514 Radio Galaxy, RC J0311+0507, and the problem of SMBHs in the Early Universe


Building: The Empress Convention Center
Room: CHIANGMAI 4
Date: 2011-07-28 02:40 PM – 02:55 PM
Last modified: 2011-06-07
Abstract

RC J0311+0507, the parent galaxy of which has a high R-magnitude and a redshift, z, of 4.514, is one of the most luminous objects in the High-z radio Universe.  MERLIN and EVN intensity and polarization maps of the object at 1.7 GHz and 5 GHz show multiple compact components and extended emission orientated in a primarily NS direction on either side of what appears to be a core. The flux density ratio between the southern and northern components is very highly asymmetric. New optical observations using the Russian 6-m optical telescope confirm the identification of the radio source with a galaxy, and show the presence of extended Ly(alpha) emission. The very high radio luminosities and the high "bulge optical emission" suggest the presence of a very massive (10**9 M(sun))  Black Hole (BH). Assuming that the age of the Universe at z=4.514 is only ~1.3 Gyr and that the standard epoch for the formation of galaxies is within the redshift range from 7 to 10, there is less than 0.5 Gyr available for the formation of RC J0311+0507. The quick growth of a BH mass solely as a result of a merger is questionable, and the simple evolution from several solar masses to 10**9 in a timescale of less than 1 Gyr appears to be improbable.


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