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 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is often incomplete and outdated.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/
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ocars.dat 237 4261 Optical characteristics of astrometric radio sources
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See also:
http://www.gao.spb.ru/english/as/ac_vlbi : PUL VLBI Analisys Center Home Page
Byte-by-byte Description of file: ocars.dat
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Bytes Format Units Label Explanations
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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
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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
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Acknowledgements:
Zinovy Malkin, malkin(at)gao.spb.ru
(End) Zinovy Malkin [Pulkovo Obs.], Patricia Vannier [CDS] 06-Aug-2009