Stability of VLBI reference frame (Gontier+, 2001)

Details Stability of VLBI reference frame (Gontier+, 2001) Stability of VLBI reference frame (Gontier+, 2001)

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ycat..33750661g&link_type=abstract

VizieR On-line Data Catalog: J/A+A/375/661. Originally published in: 2001A&A...375..661G

Statistics

Qsos, Vlbi, Positional Data, References

Scientific paper

The file table 2 gives the results of various tests and noise measurements performed on time serie of extragalactic radio source coordinates. Systematic and random behaviours in time serie of individual determinations of cooordinates for 283 sources over 1987-1999 are investigated. The random variability of the source coordinates is characterized by the χ2 test (Bevington, 1969, p.187) and the "goodness of fit (gof)" (Bevington, 1969, p.188). The Allan variance method (Allan, 1966, Proc. IEEE, vol. 54, 221) is used to investigate spectral characteristics of the time series. The source structure index (Fey & Charlot, 1997ApJS..111...95F, 2000, Cat. ) qualifies the level of position disturbance expected at the date of the map (1 for the less disturbed, 4 for the most disturbed). The estimation of "linear rates" in the coordinates is a qualifier of the systematic parts of the source instability. This table contains the 283 best observed sources and is divided in three parts, with the left hand side giving general information and counts, the middle part giving statistics in the source local frame, and the right hand side giving statistics in the equatorial frame. (1 data file).

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