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6.7-GHz methanol maser associated outflows: An evolutionary sequence

De Villiers, H.M., Chrysostomou, A., Thompson, M.A., Urquhart, J.S., Breen, S.L., Burton, M.G., Ellingsen, S.P., Fuller, G.A., Pestalozzi, M., Voronkov, M.A., and others. (2015) 6.7-GHz methanol maser associated outflows: An evolutionary sequence. Monthly Notices of the Royal Astronomical Society, 449 (1). pp. 119-128. ISSN 0035-8711. (doi:10.1093/mnras/stv173) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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http://www.dx.doi.org/10.1093/mnras/stv173

Abstract

We present a continuing study of a sample 44 molecular outflows, observed in 13CO lines, closely associated with 6.7-GHz methanol masers, hence called methanol maser associated outflows (MMAOs).We compareMMAO properties with those of outflows from other surveys in the literature. In general, MMAOs follow similar trends, but show a deficit in number at low masses and momenta, with a corresponding higher fraction at the high end of the distributions. A similar trend is seen for the dynamical time-scales of MMAOs. We argue that the lack of relatively low mass and young flows in MMAOs is due to the inherent selection-bias in the sample, i.e. its direct association with 6.7-GHz methanol masers. This implies that methanol masers must switch on after the onset of outflows (hence accretion), and not before a sufficient abundance of methanol is liberated from icy dust mantles. Consequently the average dynamical age of MMAOs is older than for the general population of molecular outflows.We propose an adjusted evolutionary sequence of outflow and maser occurrence in the hot core phase, where methanol masers turn on after the onset of the outflow phase. © 2015 The Authors.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stv173
Uncontrolled keywords: ISM: jets and outflows, Masers, Stars: evolution, Stars: formation, Stars: massive, Stars: protostars
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 23 Nov 2015 17:12 UTC
Last Modified: 29 May 2019 16:27 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52183 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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