The catalogue of positions of optically bright extragalactic radio sources OBRS-2
Leonid Petrov

TL;DR
This paper presents a catalogue of 295 optically bright extragalactic radio sources with milliarcsecond position accuracies, aiding future space-based optical and radio coordinate system comparisons and investigations of emission centroid shifts.
Contribution
It provides the first detailed VLBI-based catalogue of bright extragalactic sources with precise positions and flux densities, supporting cross-mission astrometric calibration.
Findings
Median position accuracy of 3.2 mas
Catalogue includes 295 sources with flux density estimates
Positions range from 2 to 200 mas
Abstract
It is anticipated that future space-born missions, such as Gaia, will be able to determine in optical domain positions of more than 100,000 bright quasars with sub-mas accuracies that are comparable to very long baseline interferometry (VLBI) accuracies. Comparisons of coordinate systems from space-born missions and from VLBI will be very important, first for investigation of possible systematic errors, second for investigation of possible shift between centroids of radio and optical emissions in active galaxy nuclea. In order to make such a comparison more robust, a program of densification of the grid of radio sources detectable with both VLBI and Gaia was launched in 2006. In the second observing campaign a set of 290 objects from the list of 398 compact extragalactic radio sources with declinations greater -10 deg was observed with the VLBA+EVN in 2010-2011 with the primary goal of…
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