Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.324.1102l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 4, pp. 1102-1108.
Astronomy and Astrophysics
Astronomy
10
Masers, Stars: Formation, Ism: Lines And Bands, Ism: Molecules, Infrared: Ism
Scientific paper
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 1-0 S(1) line emission was found associated with an ultracompact Hii region IRAS 14567-5846 and isolated methanol maser sites in G318.95-0.20, IRAS 15278-5620 and IRAS 16076-5134. 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 14567-5846. Within the positional uncertainties of 3arcsec, 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.
Ashley Michael C. B.
Burton Michael G.
Lee Kyung Jae
Walsh Andrew J.
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