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G305.20+0.21: A very young class II methanol maser source

Published online by Cambridge University Press:  03 August 2017

Andrew J. Walsh
Andrew J. Walsh*
Affiliation:
Max-Planck-Institut für Radioastronomie, auf dem Hügel 69, Bonn 53121, Germany

Abstract

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Sensitive radio continuum observations of G305.20+0.21 are performed to look for evidence of an ultracompact HII region. None is found at either 8.64 or 4.8GHz above a 5σ detection limit of about 0.25mJy in both cases. Since G305.20+0.21 is such a bright infrared source, there is a large discrepancy between the expected radio flux and the observed upper limits. This is interpreted as evidence that G305.20+0.21 is a massive protostar traced by a methanol maser site.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 155 - 158
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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