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LBA high resolution observations of ground- and excited-state OH masers towards G351.417+0.645

Published online by Cambridge University Press:  16 July 2018

T. Chanapote ,
K. Asanok ,
R. Dodson ,
M. Rioja ,
J. A. Green  and
B. Hutawarakorn Kramer
T. Chanapote
Affiliation:
Department of Physics, Faculty of Science, Khon Kaen University (KKU), Khon Kaen, 40002, Thailand email: [email protected] International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia (UWA), M468, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia email: [email protected]; [email protected] National Astronomical Research Institute of Thailand (NARIT), 260 Moo 4, Tambol Donkaew, Amphur Maerim, Chiang Mai, 50180, Thailand email: [email protected]
K. Asanok
Affiliation:
Department of Physics, Faculty of Science, Khon Kaen University (KKU), Khon Kaen, 40002, Thailand email: [email protected] National Astronomical Research Institute of Thailand (NARIT), 260 Moo 4, Tambol Donkaew, Amphur Maerim, Chiang Mai, 50180, Thailand email: [email protected]
R. Dodson
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia (UWA), M468, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia email: [email protected]; [email protected]
M. Rioja
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia (UWA), M468, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia email: [email protected]; [email protected] CSIRO Astronomy and Space Science, 26 Dick Perry Avenue, Kensington WA 6151, Australia Observatorio Astronómico Nacional (IGN), Alfonso XII, 3 y 5, 28014 Madrid, Spain
J. A. Green
Affiliation:
CSIRO Astronomy and Space Science, Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia email: [email protected]
B. Hutawarakorn Kramer
Affiliation:
National Astronomical Research Institute of Thailand (NARIT), 260 Moo 4, Tambol Donkaew, Amphur Maerim, Chiang Mai, 50180, Thailand email: [email protected] Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: [email protected]
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Abstract

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We present the results from the Australian Long Baseline Array (LBA) observations of the ground- and excited-state OH masers at high resolutions towards the massive star-forming region G351.417+0.645 in 2012. We obtain the most accurate spatial gradient of magnetic fields at ground state transitions and verify the reliability of magnetic field strengths measured from previous lower resolution observations. In comparison with previous LBA observations in 2001 at 6.0 GHz, we identified several matched Zeeman pairs. We found that the OH maser features have no significant change of magnetic field strengths and directions with small internal proper motions, implying quite stable physical conditions. Additionally, we found that 1665- and 6035-MHz OH maser features reveal the same trend of reversal of magnetic fields. Moreover, we also analyzed the physical conditions at different locations from the coincidence of different OH maser transitions based on current OH maser models.

Keywords

masersstars: formationISM: kinematics and dynamicsISM: magnetic fieldsISM: molecules
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. 329 - 330
Copyright
Copyright © International Astronomical Union 2018 

References

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