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

K. Asanok; B. Hutawarakorn Kramer; S. Etoka; M. Gray; A. M. S. Richards; N. Gasiprong; N. Naochang

doi:10.1017/S1743921317011498

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

K. Asanok, B. Hutawarakorn Kramer, S. Etoka, M. Gray, A. M. S. Richards, N. Gasiprong, N. Naochang

Astronomy and Astrophysics Theory Group

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

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Abstract

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.

Original language	English
Title of host publication	Proceedings of the International Astronomical Union
Subtitle of host publication	Volume 13, Symposium S336 (Astrophysical Masers: Unlocking the Mysteries of the Universe)
Pages	309-310
Volume	13
Edition	S336
DOIs	https://doi.org/10.1017/S1743921317011498
Publication status	Published - 16 Jul 2018
Event	IAU Symposium 336, Cagliari, Sardinia, Italy - Cagliari, Italy Duration: 4 Sept 2017 → 8 Sept 2017

Publication series

Name	Proceedings of the International Astronomical Union
Publisher	Cambridge University Press
ISSN (Print)	1743-9213

Conference

Conference	IAU Symposium 336, Cagliari, Sardinia, Italy
Country/Territory	Italy
City	Cagliari
Period	4/09/17 → 8/09/17

Access to Document

10.1017/S1743921317011498

iau336_normAccepted author manuscript, 966 KB

https://www.cambridge.org/core/product/identifier/S1743921317011498/type/journal_article

Cite this

Asanok, K., Kramer, B. H., Etoka, S., Gray, M., Richards, A. M. S., Gasiprong, N., & Naochang, N. (2018). Full polarization analysis of OH masers at 18-cm toward W49 A star forming region. In Proceedings of the International Astronomical Union: Volume 13, Symposium S336 (Astrophysical Masers: Unlocking the Mysteries of the Universe) (S336 ed., Vol. 13, pp. 309-310). (Proceedings of the International Astronomical Union). https://doi.org/10.1017/S1743921317011498

Asanok, K. ; Kramer, B. Hutawarakorn ; Etoka, S. et al. / Full polarization analysis of OH masers at 18-cm toward W49 A star forming region. Proceedings of the International Astronomical Union: Volume 13, Symposium S336 (Astrophysical Masers: Unlocking the Mysteries of the Universe). Vol. 13 S336. ed. 2018. pp. 309-310 (Proceedings of the International Astronomical Union).

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

abstract = "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.",

author = "K. Asanok and Kramer, {B. Hutawarakorn} and S. Etoka and M. Gray and Richards, {A. M. S.} and N. Gasiprong and N. Naochang",

year = "2018",

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publisher = "Cambridge University Press",

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Asanok, K, Kramer, BH, Etoka, S, Gray, M, Richards, AMS, Gasiprong, N & Naochang, N 2018, Full polarization analysis of OH masers at 18-cm toward W49 A star forming region. in Proceedings of the International Astronomical Union: Volume 13, Symposium S336 (Astrophysical Masers: Unlocking the Mysteries of the Universe). S336 edn, vol. 13, Proceedings of the International Astronomical Union, pp. 309-310, IAU Symposium 336, Cagliari, Sardinia, Italy, Cagliari, Italy, 4/09/17. https://doi.org/10.1017/S1743921317011498

Full polarization analysis of OH masers at 18-cm toward W49 A star forming region. / Asanok, K.; Kramer, B. Hutawarakorn; Etoka, S. et al.
Proceedings of the International Astronomical Union: Volume 13, Symposium S336 (Astrophysical Masers: Unlocking the Mysteries of the Universe). Vol. 13 S336. ed. 2018. p. 309-310 (Proceedings of the International Astronomical Union).

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

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T1 - Full polarization analysis of OH masers at 18-cm toward W49 A star forming region

AU - Asanok, K.

AU - Kramer, B. Hutawarakorn

AU - Etoka, S.

AU - Gray, M.

AU - Richards, A. M. S.

AU - Gasiprong, N.

AU - Naochang, N.

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N2 - 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.

AB - 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.

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T3 - Proceedings of the International Astronomical Union

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BT - Proceedings of the International Astronomical Union

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Asanok K, Kramer BH, Etoka S, Gray M, Richards AMS, Gasiprong N et al. Full polarization analysis of OH masers at 18-cm toward W49 A star forming region. In Proceedings of the International Astronomical Union: Volume 13, Symposium S336 (Astrophysical Masers: Unlocking the Mysteries of the Universe). S336 ed. Vol. 13. 2018. p. 309-310. (Proceedings of the International Astronomical Union). doi: 10.1017/S1743921317011498