OH 1720 MHz Masers in Supernova Remnants --- C-Shock Indicators

Details OH 1720 MHz Masers in Supernova Remnants --- C-Shock Indicators OH 1720 MHz Masers in Supernova Remnants --- C-Shock Indicators

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5316l&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #53.16; Bulletin of the American Astronomical Society, Vol. 30, p.895

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Scientific paper

Recent observations have shown that the OH 1720 MHz maser is a powerful probe of the shocked region where a supernova remnant strikes a molecular cloud. We have performed a thorough study of the pumping of this maser and have found tight constraints on the physical conditions needed for its production. The presence of the maser implies low temperatures (50 -- 150 K), low molecular densities ( ~ 10(5) cm(-3) ) and OH column densities of the order of 10(16) cm(-2) . We show that these conditions can exist only if the shocks are of C-type, thus the presence of this maser is a powerful shock diagnostic. These conditions also mean that the 1720 maser will be inherently weak compared to the other ground state OH masers. All the model predictions are in good agreement with the observations.

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