OH masers associated with compact H II regions in the G45.1 + 0.1 complex

Details OH masers associated with compact H II regions in the G45.1 + 0.1 complex OH masers associated with compact H II regions in the G45.1 + 0.1 complex

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.213..641b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 213, April 1, 1985, p. 641-655. Research supported by t

Astronomy and Astrophysics

Astronomy

28

H Ii Regions, Hydroxyl Emission, Interstellar Masers, Astronomical Maps, Interstellar Magnetic Fields, Position (Location), Radio Spectra

Scientific paper

The mainline OH masers in the G45.1 + 0.1 complex have been mapped at high resolution using MERLIN. Relative positions of the masers have been measured to an accuracy of about 10 milliarcsec. The maser emission is found to come from two sources OH 45.07 + 0.13 and OH 45.12 + 0.13 separated by 3 arcmin, each of which is associated with a compact H II region. The masers occur near the edges of the H II regions at projected distances of about 2 x 10 to the 17th cm from the center. It is suggested that the masers are in expanding envelopes of gas and dust which are being driven outwards at a velocity of about 6 km/s. The magnetic field direction determined from Zeeman splitting shows a surprising reversal between the two sources. The association between type I OH masers and compact H II regions is briefly reviewed, and it is shown that there is a general tendency for OH masers to lie at greater distances from more luminous stars, following a power law.

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