High-resolution VLA observations of the W3(OH) methanol masers

Details High-resolution VLA observations of the W3(OH) methanol masers High-resolution VLA observations of the W3(OH) methanol masers

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331l..41m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. L41-L45.

Astronomy and Astrophysics

Astrophysics

30

H Ii Regions, Interstellar Masers, Methyl Alcohol, Star Formation, Very Large Array (Vla), Brightness Temperature, High Resolution, Hydroxyl Emission, Very Long Base Interferometry

Scientific paper

VLA observations of the 9(2)-10(1) A(+) transition of methanol (CH3OH) with 0.08-arcsec resolution toward W3(OH) are presented. The emission arises from at least eight regions situated on a crescent-shaped arc which is aligned in approximately the N-S direction in front of the compact H II region. The angular sizes of the individual regions are less tha 0.04 arcsec, the brightness temperature of the most intense region is at least 10 to the 7th K. A VLBI experiment gave no fringes, implying a lower limit of 0.003 arcsec on the angular size or an upper limit of 2 X 10 to the 9th K on the brightness temperature of the strongest feature. There is a close resmeblance between the spatial distribution of the CH3OH and OH maser emission. It is concluded that the conditions required for maser action of both species must be closely related.

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