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Cambridge University Press, Publications of the Astronomical Society of Australia, (33)

DOI: 10.1017/pasa.2016.48

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A Sensitive Search for Predicted Methanol Maser Transitions with the Australia Telescope Compact Array

Journal article published in 2016 by A. Chipman, Sp P. Ellingsen ORCID, Am M. Sobolev, Dm M. Cragg
This paper is available in a repository.
This paper is available in a repository.

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Data provided by SHERPA/RoMEO

Abstract

AbstractWe have used the Australia Telescope Compact Array to search for a number of centimetre wavelength methanol transitions which are predicted to show weak maser emission towards star formation regions. Sensitive, high spatial, and spectral resolution observations towards four high-mass star formation regions which show emission in a large number of class II methanol maser transitions did not result in any detections. From these observations, we are able to place an upper limit of ≲ 1300 K on the brightness temperature of any emission from the 31A+–31A, 17−2–18−3 E (vt = 1), 124–133 A, 124–133 A+, and 41A+–41A transitions of methanol in these sources on angular scales of 2 arcsec. This upper limit is consistent with current models for class II methanol masers in high-mass star formation regions and better constraints than those provided here will likely require observations with next-generation radio telescopes.