Ring shaped 6.7 GHz methanol maser emission around a young high-mass star

Abstract

We report on EVN imaging of the 6.7 GHz methanol maser emission from the candidate high-mass protostar G23.657-0.127. The masers originate in a nearly circular ring of 127 mas radius and 12 mas width. The ring structure points at a central exciting object which characteristics are typical for a young massive star; its bolometric luminosity is estimated to be <3.2*10^4 L_sun and <1.2*10^5 L_sun for near (5.1 kpc) and far (10.5 kpc) kinematic distances, respectively. However, the spatial geometry of the underlying maser region remains ambiguous. We consider scenarios in which the methanol masers originate in a spherical bubble or in a rotating disc seen nearly face-on.

4 pages, 4 figures, accepted by Astronomy and Astrophysics Letters

References in corpus (3)

• A New Catalog of Radio Compact HII Regions in the Milky Way
• High resolution observations of 6.7-GHz methanol masers with the LBA
• Polarimetric observations of OH masers in proto-planetary nebulae

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