Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-07-30
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
14 pages, no figures. This paper has been accepted for publication in Publications of the Astronomical Society of Australia (P
Scientific paper
The Australia Telescope Compact Array (ATCA) has been used to determine positions for many southern methanol maser sites, with accuracy better than 1 arcsec. The results are presented here as a catalogue of more than 350 distinct sites, some of them new discoveries, and many others with positional precision 10 times better than existing published values. Clusters of 2 or 3 sites are occasionally found to account for single previously listed sources. This in turn reveals that the velocity range for each individual site is sometimes smaller than that of the originally tabulated (blended) source. Only a handful of examples then remain with a velocity range of more than 16 km/s at a single compact (less than 2 arcsec) site. The precise methanol positions now allow apparent coincidences with OH masers to be confidently accepted or rejected; this has led to the important conclusion that, where a 1665-MHz OH maser lies in a massive star formation region, at more than 80 percent of the OH sites there is a precisely coincident methanol maser. The methanol precision achieved here will also allow clear comparisons with likely associated IR sources when the next generation of far-IR surveys produce precise positions.
No associations
LandOfFree
Precise Positions of Methanol Masers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Precise Positions of Methanol Masers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precise Positions of Methanol Masers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-468665