EVN observations of 6.7 GHz methanol masers from Medicina survey
Abstract
We report VLBI observations of methanol masers in the brightest 51 - 60A+ transition at 6.7 GHz in NGC 281W, 18151-1208 and 19388+2357. Using the fringe rate method, absolute positions were obtained for all observed sources. A linear ordered structure with a velocity gradient was revealed in NGC 281W. Under the assumption that such a structure is an edge-on Keplerian disk around the central object with a mass of 30Modot, located at a distance of 3.5 kpc from the Sun, we estimated that the methanol masers are situated at a distance of about 400 AU from the center of the disk. A second epoch of observations is reported for L1206, GL2789 and 20062+3550. The upper limits on the relative motions of maser spots are estimated to be 4.7 km s-1 and 28 km s-1 for L1206 and GL2789 respectively.
- Publication:
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Proceedings of the 6th EVN Symposium
- Pub Date:
- June 2002
- DOI:
- 10.48550/arXiv.astro-ph/0205547
- arXiv:
- arXiv:astro-ph/0205547
- Bibcode:
- 2002evn..conf..213V
- Keywords:
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- Astrophysics
- E-Print:
- 2 pages, 1 table, 2 figures, proceedings of the 6th EVN Symposium