Astrometry from VLBA Observations at 24 And 43 GHz
NAVAL OBSERVATORY WASHINGTON DC
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Astrometric results are obtained from a collaboration formed to study extragalactic objects at radio frequencies between 20 and 50 GHz The K-Q VLBI Survey Collaboration. We analyzed ten 24-hour observing sessions at the VLBA interferometer over a 5-yr period, including nearly three hundred radio sources. Our analysis indicates reduction in source structure effects on source positions relative to X-Band observations. The median formal uncertainties of right ascension and declination are 0.08 and 0.15 milliarcseconds, and the average absolute difference between the K-band 24 GHz and the S-X estimated source positions are 0.17 and 0.23 milliarsceonds, respectively. These differences are partly due to absent or inadequate modeling of physical effects.
- Radiofrequency Wave Propagation