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The extraordinary outburst in NGC6334I-MM1: dimming of the hypercompact HII region and destruction of water masers

Published online by Cambridge University Press:  16 July 2018

Crystal L. Brogan ,
Todd R. Hunter ,
Gordon MacLeod ,
James O. Chibueze  and
Claudia J. Cyganowski
Crystal L. Brogan
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Rd, Charlottesville, VA 22903, USA email: thunter@nrao.edu
Todd R. Hunter
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Rd, Charlottesville, VA 22903, USA email: thunter@nrao.edu
Gordon MacLeod
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, PO Box 443, Krugersdorp 1740, South Africa
James O. Chibueze
Affiliation:
SKA South Africa, 3rd Floor, The Park, Park Road, Pinelands, Cape Town, 7405, South Africa
Claudia J. Cyganowski
Affiliation:
SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, UK
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Abstract

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We present subarcsecond resolution pre- and post-outburst JVLA continuum and water maser observations of the massive protostellar outburst source NGC6334I-MM1. The continuum data at 5 and 1.4 cm reveal that the free-free emission powered by MM1B, modeled as a hypercompact HII region from our 2011 JVLA data, has dropped by a factor of 5.4. Additionally, the water maser emission toward MM1, which had previously been strong (500 Jy) has dramatically reduced. In contrast, the water masers in other locations in the protocluster have flared, with the strongest spots associated with CM2, a non-thermal radio source that appears to mark a shock in a jet emanating 2″ (2600 au) northward from MM1. The observed quenching of the HCHII region suggests a reduction in uv photon production due to bloating of the protostar in response to the episodic accretion event.

Keywords

Massive protostarsaccretionmasers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 255 - 258
Copyright
Copyright © International Astronomical Union 2018 

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