Computer Science
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.2995e&link_type=abstract
ATNF proposal V255, Semester: April, 2010
Computer Science
Masers (Galactic And Extragalactic), Star Formation, Lba
Scientific paper
The primary aim of this project is to use VLBI observations to measure accurate distances to and proper motions of 6.7 GHz methanol masers in the third and fourth quadrants of the Galaxy. These observations will allow us to improve our knowledge of the structure of the Galaxy and complements a similar study being done in the northern hemisphere looking at 12.2 GHz methanol masers in the first and second quadrants. The northern observations suggest high-mass star formation regions on average orbit the Galaxy 15 km/s more slowly than expected from circular orbit models and measure a circular rotation speed for the Sun of 254 km/s. These results are however, derived from limited data and remain controversial. More measurements of parallax and proper motion for high-mass star forming regions in the southern sky of the Milky Way are critical to better constrain and confirm these results.
Brunthaler Andreas
Caswell James
Chen Xi
Dodson Richard
Ellingsen Simon
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