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Discovery of molecular hydrogen line emission associated with methanol maser emission
 

Summary: Discovery of molecular hydrogen line emission associated with methanol
maser emission
J.-K. Lee,P
A. J. Walsh, M. G. Burton and M. C. B. Ashley
School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
Accepted 2001 February 6. Received 2001 February 6; in original form 2000 March 9
A B S T R AC T
We report the discovery of H2 line emission associated with 6.67-GHz methanol maser
emission in massive star-forming regions. In our UNSWIRF/AAT observations, H2 10 S(1)
line emission was found associated with an ultracompact H II region IRAS 145675846 and
isolated methanol maser sites in G318:950:20, IRAS 152785620 and IRAS 160765134.
Owing to the lack of radio continuum in the latter three sources, we argue that their H2
emission is shock excited, while it is UV-fluorescently excited in IRAS 145675846. Within
the positional uncertainties of 3 arcsec, the maser sites correspond to the location of infrared
sources. We suggest that 6.67-GHz methanol maser emission is associated with hot molecular
cores, and propose an evolutionary sequence of events for the process of massive star
formation.
Key words: masers stars: formation ISM: lines and bands ISM: molecules infrared:
ISM.
1 IN T ROD UCTI ON

  

Source: Ashley, Michael C. B. - School of Physics, University of New South Wales

 

Collections: Physics