Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..48h&link_type=abstract
Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #48
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present the initial results of investigations of a new sample of extragalactic compact radio sources selected to search for far-Quasars. Our investigation is the most efficient way of finding high redshift quasars and hence their distance and distribution in space that can provide an answer to some questions about the possibly layered distribution of the matter in the Universe. For this purpose 289 compact radio sources (angular sizes are less than 0".1) covering an area of 0.097 radian squares (from 7C catalogue) on 102 MHz by the interplanetary scintillation method were surveyed. We have identified these sources with the objects from the FIRST (on 1400 MHz) catalogue of radio sources, and chosen isolated radio sources. The isolation criterion is that there are no radio loud objects in the 5'x5' region, brighter than 1 mJy in FIRST catalogue. The investigation of sources which have flux densities exceeding 2 Jy shows that these compact radio sources are exceptionally known Quasars (identification for such a 24 compact radio sources with quasars are performed). Relying on these results we suppose that the radio sources which have flux densities not exceeding 2 Jy are also far Quasars. We have such a 98 weak, compact and isolated radio sources (flux densities < 2 Jy) and the identification of those sources for the optical objects from Palomar atlas shows that we have no optical objects in 30'' x 30'' region over our compact radio sources. Through the 2.6 m BAO telescope the optical observations and optical identifications for a 17 (from 98) compact radio sources are already performed, 5 of them have optical objects in 3'' surroundings the magnitudes of which in red and infrared area are less than 22^m - 24^m. We think that our further efforts will allow us to affirm the identification of these sources with far Quasars.
Harutyunyan A. N.
Hovhannisyan M. A.
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