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Article: A biconically expanding flow in W43A traced by SiO maser emission
Title | A biconically expanding flow in W43A traced by SiO maser emission |
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Authors | |
Keywords | Masers Stars: Agb And Post-Agb Stars: Individual (W43a) Stars: Mass Loss Stars: Winds, Outflows |
Issue Date | 2005 |
Publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 |
Citation | Astrophysical Journal Letters, 2005, v. 622 n. 2 II, p. L125-L128 How to Cite? |
Abstract | We report Very Long Baseline Array and Very Large Array observations of 22 GHz H 2O and 43 GHz SiO (v = 1, J = 1-0) maser emission as well as 7 mm continuum emission in W43A, which exhibits a highly collimated jet of molecular gas and a spherically expanding envelope very similar to that of an OH/IR star. The spatiokinematical structure of the H 2O masers is well fitted to a precessing jet model with an expansion velocity of 150 km s -1 and a dynamical age of ∼50 yr. The spatiokinematical structure of the SiO masers is well fitted to a biconically expanding flow model, whose axis is parallel to the direction of the collimated jet. Astrometry of the H 2O and SiO masers suggests that these maser sources have a common dynamical center, possibly as part of a binary system, within 70 AU. The SiO masers may be excited on the surface of the cone that has significant deceleration and interacts with the jet. A 7 mm continuum emission source is located ∼1300 AU away from these maser sources at a position angle of about -60° from the jet axis. The physical relation of the continuum to the maser sources is still unclear. © 2005. The American Astronomical Society. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/174947 |
ISSN | 2023 Impact Factor: 8.8 2023 SCImago Journal Rankings: 2.766 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Imai, H | en_US |
dc.contributor.author | Nakashima, JI | en_US |
dc.contributor.author | Diamond, PJ | en_US |
dc.contributor.author | Miyazaki, A | en_US |
dc.contributor.author | Deguchi, S | en_US |
dc.date.accessioned | 2012-11-26T08:48:18Z | - |
dc.date.available | 2012-11-26T08:48:18Z | - |
dc.date.issued | 2005 | en_US |
dc.identifier.citation | Astrophysical Journal Letters, 2005, v. 622 n. 2 II, p. L125-L128 | en_US |
dc.identifier.issn | 2041-8205 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/174947 | - |
dc.description.abstract | We report Very Long Baseline Array and Very Large Array observations of 22 GHz H 2O and 43 GHz SiO (v = 1, J = 1-0) maser emission as well as 7 mm continuum emission in W43A, which exhibits a highly collimated jet of molecular gas and a spherically expanding envelope very similar to that of an OH/IR star. The spatiokinematical structure of the H 2O masers is well fitted to a precessing jet model with an expansion velocity of 150 km s -1 and a dynamical age of ∼50 yr. The spatiokinematical structure of the SiO masers is well fitted to a biconically expanding flow model, whose axis is parallel to the direction of the collimated jet. Astrometry of the H 2O and SiO masers suggests that these maser sources have a common dynamical center, possibly as part of a binary system, within 70 AU. The SiO masers may be excited on the surface of the cone that has significant deceleration and interacts with the jet. A 7 mm continuum emission source is located ∼1300 AU away from these maser sources at a position angle of about -60° from the jet axis. The physical relation of the continuum to the maser sources is still unclear. © 2005. The American Astronomical Society. All rights reserved. | en_US |
dc.language | eng | en_US |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205 | en_US |
dc.relation.ispartof | Astrophysical Journal Letters | en_US |
dc.subject | Masers | en_US |
dc.subject | Stars: Agb And Post-Agb | en_US |
dc.subject | Stars: Individual (W43a) | en_US |
dc.subject | Stars: Mass Loss | en_US |
dc.subject | Stars: Winds, Outflows | en_US |
dc.title | A biconically expanding flow in W43A traced by SiO maser emission | en_US |
dc.type | Article | en_US |
dc.identifier.email | Nakashima, JI: junichi@hku.hk | en_US |
dc.identifier.authority | Nakashima, JI=rp00764 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1086/429820 | en_US |
dc.identifier.scopus | eid_2-s2.0-19844370077 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-19844370077&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 622 | en_US |
dc.identifier.issue | 2 II | en_US |
dc.identifier.spage | L125 | en_US |
dc.identifier.epage | L128 | en_US |
dc.identifier.isi | WOS:000228093800013 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Imai, H=35484255500 | en_US |
dc.identifier.scopusauthorid | Nakashima, JI=35485342300 | en_US |
dc.identifier.scopusauthorid | Diamond, PJ=7102763138 | en_US |
dc.identifier.scopusauthorid | Miyazaki, A=7201588306 | en_US |
dc.identifier.scopusauthorid | Deguchi, S=7006314159 | en_US |
dc.identifier.issnl | 2041-8205 | - |