Methanol Survey of the Northern Galactic Plane

Details Methanol Survey of the Northern Galactic Plane Methanol Survey of the Northern Galactic Plane

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acc....23...99m&link_type=abstract

Acta Cosmologica, Vol. 23, p. 99

Mathematics

Logic

Maser, Star Formation

Scientific paper

An extensive survey of northern hemisphere masers for 6.7 GHz methanol emission has been undertaken using the newly equipped Onsala 25m telescope. The 51rightarrow60 A+ transition at 6.668 GHz is the strongest Class II methanol maser emission and appears to be a very good tracer of massive star formation regions. It is generally believed that this maser emission arises from circumstellar disc containing warm molecular gas. Observations in Australia have shown that the maser spots lie in lines or arcs and several exhibit velocity gradient indicative of Keplerian rotation in edge-on rotating discs. Recently, we have conducted EVN observations at 6.7 GHz as well as 12.2 GHz to investigate these exciting structures of the maser spots through five bright sources never observed by VLBI before. Preliminary results at 6.7 GHz reveal a velocity gradient in NGC7538 which is consitent with a circumstellar disc of linear size 1000 AU rotating around a 10Modot nascent star.

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