Emission and absorption at 6 CM from excited OH associated with compact H II regions

Details Emission and absorption at 6 CM from excited OH associated with compact H II regions Emission and absorption at 6 CM from excited OH associated with compact H II regions

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121..265g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 2, May 1983, p. 265-270.

Astronomy and Astrophysics

Astrophysics

39

H Ii Regions, Hydroxyl Emission, Interstellar Masers, Absorption, Centimeter Waves, Cosmic Dust, Thermal Emission

Scientific paper

Attention is given to the detection towards ten compact H II regions of quasi-thermally excited OH in the 2pi(1/2), J = 1/2 state, where the OH is probably located in dense regions just outside the ionization front and far-IR emission from hot dust is the probable main source of excitation. While the F = 1-1 line at 4750 MHz was seen only in the quasi-thermal emission line, the F = 1-0 line at 4765 MHz, with similar or slightly greater intensity, was frequently accompanied by narrowband maser emission. It is noted that while high gain masers were often encountered at 4765 MHz, they were found at 4660 MHz in only one case, and never at 4750 MHz. Widths varied between 0.15 and 0.50 km/sec.

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