Multifrequency observations of ROSAT selected radio sources

Details Multifrequency observations of ROSAT selected radio sources Multifrequency observations of ROSAT selected radio sources

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..163n&link_type=abstract

In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 163-168 (SEE

Astronomy and Astrophysics

Astronomy

2

Radiant Flux Density, Radio Observation, Radio Sources (Astronomy), Rosat Mission, X Ray Astronomy, Sky Surveys (Astronomy), Spectral Correlation, Spectrum Analysis

Scientific paper

A status report and first results on multifrequency radio continuum observations with the Effelsberg 100 m telescope of radio sources which have counterparts in the Rosat all sky survey are given. Up to now more than 200 sources have been observed at 21, 11, 6 and 2.8 cm wavelength in the flux density range above 20 mJy. From these observations the spectrum, size, linear polarization and improved positions of these sources were determined. A comparison of the more precise radio positions with the Rosat positions indicates a systematic difference of about 20 inches. The statistical properties of the Rosat selected radio sources are given and compared with results from unbiased source surveys so far available. In general the differences are small. A weak excess of flat spectrum sources and a higher fraction of unresolved sources is found. Cumulative counts of the radio sources, however, show an increasing deficit of weak sources. At 11 cm wavelength there are about three times less sources at 100 mJy than expected and this deficit increases to more than a factor of 10 at a level of 30 mJy. The cumulative counts of the X-ray sources from the Rosat survey indicate a deficit of sources below 10 to the minus 12th power erg/sq cm.s. No global correlation between radio flux densities and X-ray flux densities was found. The sample of sources is at present not large enough to establish any possible correlation for distinct groups of radio sources with common properties.

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