Synthesis images of 6.7 GHz methanol masers

Details Synthesis images of 6.7 GHz methanol masers Synthesis images of 6.7 GHz methanol masers

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..222n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 1, p. 222-232.

Astronomy and Astrophysics

Astrophysics

133

Image Analysis, Interstellar Masers, Methyl Alcohol, Star Formation, Emission Spectra, Planetary Nebulae, Protoplanets

Scientific paper

We have used the Australia Telescope Compact Array to produce maps in the 6.7 GHz (5(1)-6(0)A(+)) transition of a number of methanol masers associated with star-forming regions and compared them with earlier maps of the 12.2 GHz (2(0)-3(-1)E) methanol masers. We find that in several cases the 6.7 GHz and 12.2 GHz maser positions are coincident to within our positional accuracy of 0.02 arcsec, placing a tight constraint on pumping mechanisms. We also find that the methanol masers are frequently located along lines or arcs, sometimes with velocity gradients along them, and interpret this to indicate the existence of edge-on protoplanetary disks around the nascent stars.

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