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Full polarization analysis of OH masers at 18-cm toward W49 A star forming region

Published online by Cambridge University Press:  16 July 2018

K. Asanok ,
B. Hutawarakorn Kramer ,
S. Etoka ,
M. Gray ,
A. M. S. Richards ,
N. Gasiprong  and
N. Naochang
K. Asanok
Affiliation:
National Astronomical Research Institute of Thailand, 260 Moo 4, Tambol Donkaew, Amphur Maerim, Chiang Mai, 50180, Thailand email: kitiyanee@narit.or.th Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand
B. Hutawarakorn Kramer
Affiliation:
National Astronomical Research Institute of Thailand, 260 Moo 4, Tambol Donkaew, Amphur Maerim, Chiang Mai, 50180, Thailand email: kitiyanee@narit.or.th Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: bkramer@mpifr-bonn.mpg.de
S. Etoka
Affiliation:
Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, The University of Manchester, Alan Turing Building, Oxford Road, Manchester, M13 9PL, United Kingdom email: sandra.etoka@manchester.ac.uk, malcolm.gray@manchester.ac.uk, a.m.s.richards@manchester.ac.uk
M. Gray
Affiliation:
Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, The University of Manchester, Alan Turing Building, Oxford Road, Manchester, M13 9PL, United Kingdom email: sandra.etoka@manchester.ac.uk, malcolm.gray@manchester.ac.uk, a.m.s.richards@manchester.ac.uk
A. M. S. Richards
Affiliation:
Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, The University of Manchester, Alan Turing Building, Oxford Road, Manchester, M13 9PL, United Kingdom email: sandra.etoka@manchester.ac.uk, malcolm.gray@manchester.ac.uk, a.m.s.richards@manchester.ac.uk
N. Gasiprong
Affiliation:
Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190, Thailand email: ngasiprong@yahoo.com
N. Naochang
Affiliation:
Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand
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Abstract

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W49 A is a star-forming region (SFR) found in the constellation of Aquila. It contains 3 active regions: W49 North (W49 N), W49 South West (W49 SW) and W49 South (W49 S). We present preliminary results from two epochs (e-)MERLIN observations of all ground-state OH masers towards the star-forming region (SFR) complex W49 A. The first epoch of observations was done in full-polarization mode with MERLIN in 2005 while the second epoch was obtained only in dual circular polarization during the test observations of the upgraded e-MERLIN in 2013. The overall maser spatial distributions in both epochs are in good agreement. We found several new high velocity maser features up to +34 km s−1 and −28 km s−1. The magnetic field strengths are between 1.1 to 10.8 mG. All three sources show evidence of magnetic field reversal.

Keywords

masersISM: HII regionsISM:kinematics and dynamicsISM:magnetic fieldsISM:moleculesstars: formation
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. 309 - 310
Copyright
Copyright © International Astronomical Union 2018 

References

Argon, A. L., Reid, M. J., & Menten, K. M., 2000, ApJ.S., 29, 159Google Scholar