On the association of the 1720 MHz OH masers with the H2CO masers in NGC 7538 /IRSI/

Details On the association of the 1720 MHz OH masers with the H2CO masers in NGC 7538 /IRSI/ On the association of the 1720 MHz OH masers with the H2CO masers in NGC 7538 /IRSI/

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101l..19g&link_type=abstract

Astronomy and Astrophysics, vol. 101, no. 3, Sept. 1981, p. L19-L21.

Astronomy and Astrophysics

Astrophysics

5

Formaldehyde, Hydroxyl Emission, Interstellar Masers, Water Masers, Astrophysics, H Ii Regions, Radiant Flux Density

Scientific paper

High-spectral-resolution (0.03 km/s) observations of the 1720 MHz OH masers associated with the ultracompact H II region NGC 7538 have been made. The spectrum exhibits about 10 circularly polarized velocity features, with LSR velocities ranging from -59.4 to -56.0 km/s. This suggests that these masers are not closely related to the H2CO maser in this region. Implications of the data for the pumping mechanisms of both masers are discussed, and it is shown that 1720 MHz OH masers imply densities at least one order of magnitude higher than that expected for H2CO masers.

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