Indications for Frequency Dependent Radio Core Position in 1823+568

Details Indications for Frequency Dependent Radio Core Position in 1823+568 Indications for Frequency Dependent Radio Core Position in 1823+568

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ivsg.conf..342p&link_type=abstract

International VLBI Service for Geodesy and Astrometry: 2000 General Meeting Proceedings, p. 342

Astronomy and Astrophysics

Astronomy

4

Astrometry, Very Long Base Interferometry, Astronomical Coordinates, Radio Sources (Astronomy), Calibrating, Radio Frequencies, Position (Location)

Scientific paper

The International Celestial Reference Frame (ICRF) defining source 1823+568 was observed as a calibrator in our multi-frequency very long baseline interferometry (VLBI) experiment. Images taken at 5, 8.4, 15 and 22 GHz reveal that there is a shift in position of the source between these frequencies. The shift of the "radio core" in this object is qualitatively in agreement with predictions of conical jet models developed for radio-loud active galactic nuclei (AGN). This effect can be quite common in quasars, and "ultra-precise" astrometric projects may require a correction for it in the future.

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