Abstract
Milliarcsecond-accurate radio positions for 25 southern hemisphere extragalactic sources are reported. These positions are derived from Mark III Very Long Baseline Interferometry observations made between 2003 September and 2004 May on the intra-Australia baseline connecting Hobart, Tasmania and Parkes, New South Wales. The results presented here represent an ongoing program intended to increase the number of phase-reference sources with accurate positions in the southern hemisphere for use in astrophysical observations. The positions for all but 1 of the 25 sources are south of δ = -45° and have average formal uncertainties of 3 mas in α cos δ and 2 mas in δ. As the reported positions are in the frame of the International Celestial Reference Frame (ICRF), the results reported here can also be used to increase the sky density of southern hemisphere ICRF sources, although with reduced accuracy.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
