St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

The extraordinary outburst in the massive protostellar system NGC6334I-MM1 : flaring of the water masers in a north-south bipolar outflow driven by MM1B

Thumbnail
View/Open
1809.04178v1.pdf (3.150Mb)
Date
16/10/2018
Author
Brogan, C. L.
Hunter, T. R.
Cyganowski, C. J.
Chibueze, J. O.
Friesen, R. K.
Hirota, T.
MacLeod, G. C.
McGuire, B. A.
Sobolev, A. M.
Keywords
Stars: formation
Masers
Stars: protostars
ISM: individual objects (NGC 6334I)
Radio continuum: ISM
Submillimeter: ISM
QC Physics
QB Astronomy
3rd-DAS
Metadata
Show full item record
Abstract
We compare multi-epoch sub-arcsecond VLA imaging of the 22 GHz water masers toward the massive protocluster NGC6334I observed before and after the recent outburst of MM1B in (sub)millimeter continuum. Since the outburst, the water maser emission toward MM1 has substantially weakened. Simultaneously, the strong water masers associated with the synchrotron continuum point source CM2 have flared by a mean factor of 6.5 (to 4.2 kJy) with highly-blueshifted features (up to 70 km s-1 from LSR) becoming more prominent. The strongest flaring water masers reside 3000 au north of MM1B and form a remarkable bow shock pattern whose vertex coincides with CM2 and tail points back to MM1B. Excited OH masers trace a secondary bow shock located ~120 au downstream. ALMA images of CS (6-5) reveal a highly-collimated north-south structure encompassing the flaring masers to the north and the non-flaring masers to the south seen in projection toward the MM3-UCHII region. Proper motions of the southern water masers over 5.3 years indicate a bulk projected motion of 117 km s-1 southward from MM1B with a dynamical time of 170 yr. We conclude that CM2, the water masers, and many of the excited OH masers trace the interaction of the high velocity bipolar outflow from MM1B with ambient molecular gas. The previously-excavated outflow cavity has apparently allowed the radiative energy of the current outburst to propagate freely until terminating at the northern bow shock where it strengthened the masers. Additionally, water masers have been detected toward MM7 for the first time, and a highly-collimated CS (6-5) outflow has been detected toward MM4.
Citation
Brogan , C L , Hunter , T R , Cyganowski , C J , Chibueze , J O , Friesen , R K , Hirota , T , MacLeod , G C , McGuire , B A & Sobolev , A M 2018 , ' The extraordinary outburst in the massive protostellar system NGC6334I-MM1 : flaring of the water masers in a north-south bipolar outflow driven by MM1B ' , Astrophysical Journal , vol. 866 , no. 2 , 87 . https://doi.org/10.3847/1538-4357/aae151
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.3847/1538-4357/aae151
ISSN
0004-637X
Type
Journal article
Rights
© 2018. The American Astronomical Society. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.3847/1538-4357/aae151
Description
C.J. Cyganowski acknowledges support from the STFC (grant number ST/M001296/1).
Collections
  • University of St Andrews Research
URL
http://arxiv.org/abs/1809.04178v1
URI
http://hdl.handle.net/10023/16143

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter