========================================================================== J/A+A/506/1477 Radio source distribution (Titov+, 2009) The following files can be converted to FITS (extension .fit or fit.gz) ocars.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/A+A/506/1477 ==========================================================================
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Beginning of ReadMe : J/A+A/506/1477 Radio source distribution (Titov+, 2009) ================================================================================ Effect of asymmetry of the radio source distribution on the apparent proper motion kinematic analysis. Titov O., Malkin Z. <Astron. Astrophys. 506, 1477 (2009)> =2009A&A...506.1477T ================================================================================ ADC_Keywords: Radio sources ; VLBI ; Positional data ; Magnitudes, photovisual ; Redshifts Keywords: astrometry - techniques: interferometric - astronomical data bases: miscellaneous - cosmology: miscellaneous Abstract: Information on physical characteristics of astrometric radio sources, such as magnitude and redshift, is of great importance for many astronomical studies. However, data usually used in radio astrometry is often incomplete and outdated. Our purpose is to study the optical characteristics of more than 4000 radio sources observed by the astrometric VLBI technique since 1979. We also studied the effect of the asymmetry in the distribution of the reference radio sources on the correlation matrices between vector spherical harmonics of the first and second degrees. The radio source characteristics were mainly taken from the NASA/IPAC Extragalactic Database (NED). Characteristics of the gravitational lenses were checked with the CfA-Arizona Space Telescope LEns Survey. SIMBAD and HyperLeda databases were also used to clarify the characteristics of some objects. Also we simulated and investigated a list of 4000 radio sources evenly distributed around the celestial sphere. We estimated the correlation matrices between the vector spherical harmonics using the real as well as modelled distribution of the radio sources. Description: This file contains a list of astrometric radio sources with optical characteristics when available. These data are regularly updated. The latest version is located at http://www.gao.spb.ru/english/as/ac_vlbi/
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