Milliarcsecond observations of 12 GHz methanol masers

Details Milliarcsecond observations of 12 GHz methanol masers Milliarcsecond observations of 12 GHz methanol masers

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333l..79m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. L79-L82.

Astronomy and Astrophysics

Astrophysics

14

Brightness Temperature, Interstellar Masers, Interstellar Matter, Methyl Alcohol, Star Formation, Very Long Base Interferometry, Astronomical Observatories, High Resolution, Maser Outputs, Water Masers

Scientific paper

Long-baseline interferometer observations, with a fringe spacing of about 20 mas, have been made of eight methanol masers at a frequency of 12.178 GHz. These are the highest resolution observations of such methanol masers, and all eight sources were detected. Comparisons of interferometer and single-dish spectra show that most of the spectral features are reduced in amplitude, but some are unresolved, implying component sizes of less than 6 mas and equivalent brightness temperatures exceeding 10 to the 10th K. Limited phase information suggests that the positions of the individual features are clustered in regions with sizes typically 18 mpc, which are similar to those measured for OH masers.

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