Extending the ICRF to higher radio frequencies - first imaging results

Details Extending the ICRF to higher radio frequencies - first imaging results Extending the ICRF to higher radio frequencies - first imaging results

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..611f&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

International Celestial Reference System

Scientific paper

We present first imaging results and source structure analysis of 65 extragalactic radio sources observed using the Very Long Baseline Array (VLBA) at 24 GHz and 43 GHz as part of a joint NASA USNO NRAO and Bordeaux Observatory program to extend the International Celestial Reference Frame (ICRF) to higher radio frequencies. The long term goals of this program are a) to develop higher frequency reference frames for improved deep space navigation b) to extend the VLBA calibrator catalog at 24 and 43 GHz c) to provide the benefit of the ICRF catalog to new applications at these higher frequencies and d) to study source structure variation at 24 and 43 GHz in order to improve the astrometric accuracy. Preliminary analysis of the observations taken to date shows that the sources are generally more compact as one goes from the ICRF frequency of 8.4 GHz to 24 GHz. This result is consistent with the standard theory of compact extragalactic radio sources and suggests that reference frames defined at these higher radio frequencies will be less susceptible to the effects of intrinsic source structure than those defined at lower frequencies.

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