On the spatial coincidence of hydroxyl and methanol masers

Details On the spatial coincidence of hydroxyl and methanol masers On the spatial coincidence of hydroxyl and methanol masers

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272..184h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 1, pp. 184-188.

Astronomy and Astrophysics

Astronomy

50

Masers-Molecular Processes-H Ii Regions-Radio Lines, Ism.

Scientific paper

We argue that purely gas-phase chemical models for the production of OH in hydroxyl masers around ultracompact H II regions such as W3(OH) cannot account for the CH_3OH in the methanol masers that are found to coincide with the hydroxyl masers in these sources. We suggest that the CH_3OH in the masers is injected into the gas phase by evaporation of the grain mantles, the grains being heated by the passage of weak shocks. Gas evaporation also injects H_2O into the gas. Photodissociation of H_2O, CH_3OH and OH occur at similar rates, and substantial abundances of CH_3OH and OH coexist.

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