Japanese VLBI network observations of 6.7-GHz methanol masers II. Results

Details Japanese VLBI network observations of 6.7-GHz methanol masers II. Results Japanese VLBI network observations of 6.7-GHz methanol masers II. Results

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..242..176s&link_type=abstract

Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p.

Astronomy and Astrophysics

Astrophysics

2

Masers, Stars: Formation, H Ii Regions, Ism: Individual (Cepheus A)

Scientific paper

We are using a Japanese VLBI network (JVN) for VLBI observations of 6.7-GHz methanol masers associated with massive star-forming regions. Here we present results for Cepheus A (Cep A) from observations taken on September 9, 2006. The distribution of the maser spots indicates either a spherical bubble or a disk having an inclination of several tens degree. We construct a disk model with an inclination of ~70° and a radius of ~700 AU. From a luminosity of 1.7 × 104 L for a source observed in this region, the excitation of the maser is probably radiative.

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