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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 

References

Abraham, Z., Cohen, N. L., Opher, R., Raffaelli, J. C., & Zisk, S. H. 1981, A&A, 100, L10Google Scholar
Brogan, C. L., Hunter, T. R., Cyganowski, C. J., et al. 2016, ApJ, 832, 187Google Scholar
Caratti o Garatti, A., Stecklum, B., Garcia Lopez, R., et al. 2016, Nature (Physics) 13, 276Google Scholar
Chibueze, J. O., Omodaka, T., Handa, T., et al. 2014, ApJ, 784, 114CrossRefGoogle Scholar
Diaz-Miller, R. I., Franco, J., & Shore, S. N. 1998, ApJ, 501, 192Google Scholar
Evans, N. J. II, Dunham, M. M., Jørgensen, J. K., et al. 2009, ApJ (Supplement) 181, 321–3510Google Scholar
Goedhart, S., Gaylard, M. J., & van der Walt, D. J. 2004, MNRAS, 355, 553Google Scholar
Hanson, M. M., Howarth, I. D., & Conti, P. S. 1997, ApJ, 489, 698Google Scholar
Hirota, T., Tsuboi, M., Kurono, Y., et al. 2014, PASJ, 66, 106CrossRefGoogle Scholar
Hosokawa, T. & Omukai, K. 2009, ApJ, 691, 823Google Scholar
Hunter, T. R., et al., 2017b, ApJ, submittedGoogle Scholar
Hunter, T. R., Brogan, C. L., MacLeod, G., et al. 2017a, ApJ, 837, L29Google Scholar
Hunter, T. R., Brogan, C. L., Megeath, S. T., et al., 2006, ApJ, 649, 888Google Scholar
Inayoshi, K., Sugiyama, K., Hosokawa, T., Motogi, K., & Tanaka, K. E. I. 2013, ApJ, 769, L20Google Scholar
Kenyon, S. J., Hartmann, L. W., Strom, K. M., & Strom, S. E. 1990, AJ, 99, 869CrossRefGoogle Scholar
MacLeod, G., et al., 2018, MNRAS, acceptedGoogle Scholar
MacLeod, G. C. & Gaylard, M. J. 1996, MNRAS, 280, 868Google Scholar
McGuire, B. A. 2017, ApJ, 851, L46Google Scholar
Moscadelli, L., Sanna, A., Goddi, C., et al. 2017, A&A, 600, L8Google Scholar
Offner, S. S. R. & McKee, C. F. 2011, ApJ, 736, 53Google Scholar
Omodaka, T., Maeda, T., Miyoshi, M., et al. 1999, PASJ, 51, 333CrossRefGoogle Scholar
Reid, M. J., Menten, K. M., Brunthaler, A., et al. 2014, ApJ, 783, 130Google Scholar
Tolmachev, A. 2011, The Astronomer's Telegram 3177Google Scholar
Turner, B. E. & Matthews, H. E. 1984, ApJ, 277, 164Google Scholar
Zernickel, A., Schilke, P., Schmiedeke, A., et al. 2012, A&A, 546, A87Google Scholar