Extending the ICRF to Higher Radio Frequencies: Astrometry at 24 and 43 GHz

Details Extending the ICRF to Higher Radio Frequencies: Astrometry at 24 and 43 GHz Extending the ICRF to Higher Radio Frequencies: Astrometry at 24 and 43 GHz

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..340..523j&link_type=abstract

Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA, ASP Conference Proceedings, Vol. 340. Edited

Astronomy and Astrophysics

Astronomy

3

Scientific paper

A program of survey observations using the Very Long Baseline Array (VLBA) at K-band (24 GHz) and Q-band (43 GHz) was begun in 2002 as a first step toward the goal of extending the ICRF to frequencies above 8.4 GHz. Each session covers the full range of right ascension and declinations down to ≈ -30 deg. Analysis of the first three sessions has produced a full sky catalog of 108 sources with median K-band formal position uncertainties of 210 and 280 μas in α cos(δ) and δ, respectively. For Q-band the corresponding results are 292 and 404 μas. Group delay residuals were excellent at ≈ 20 ps weighted RMS. An external comparison of the K-band frame to the S/X-band ICRF shows systematic errors at about 2 times larger than the formal precision. These systematic differences include a zonal trend vs. declination. We suspect that these errors are due in part to the North-South geometric weakness of the array.

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