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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 However, data usually used in radio astrometry is often incomplete and outdated.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 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ocars.dat 237 4261 Optical characteristics of astrometric radio sources
See also: : PUL VLBI Analisys Center Home Page Byte-by-byte Description of file: ocars.dat
Bytes Format Units Label Explanations
1- 8 A8 --- IERS IERS designation (HHMM+DDd) (1) 10- 11 I2 h RAh Right ascension, J2000 13- 14 I2 min RAm Right ascension, J2000 16- 22 F7.4 s RAs Right ascension, J2000 24 A1 --- DE- Declination sign J2000 25- 26 I2 deg DEd Declination, J2000 28- 29 I2 arcmin DEm Declination, J2000 31- 36 F6.3 arcsec DEs Declination, J2000 37- 45 F9.6 --- z ? Redshift 47- 51 F5.2 mag vmag ? Visual (or other band) magnitude 52 A1 --- n_vmag Filter of vmag 53- 55 A3 --- f_vmag Variability flag 57- 58 A2 --- Type Object type (2) 60-237 A178 --- Notes Notes
Note (1): 8-char IERS designation HHMMsDDd is an abridged version of the full IAU-compliant name 'IERS BHHMMsDDd'. Note (2): Object class is abbreviated as follows: A = AGN (QSO in NED) G = galaxy G2 = double galaxy V = visual source * = star R = radio source
Acknowledgements: Zinovy Malkin, malkin(at)
(End) Zinovy Malkin [Pulkovo Obs.], Patricia Vannier [CDS] 06-Aug-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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