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Article: High velocity precessing jets from the water fountain IRAS18286-0959 revealed by very long baseline array observations
Title | High velocity precessing jets from the water fountain IRAS18286-0959 revealed by very long baseline array observations | ||||||||||||
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Authors | |||||||||||||
Keywords | masers stars: AGB and post-AGB stars: evolution stars: winds, outflows | ||||||||||||
Issue Date | 2011 | ||||||||||||
Publisher | Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/ | ||||||||||||
Citation | Astrophysical Journal, 2011, v. 741 n. 2 How to Cite? | ||||||||||||
Abstract | We report the results of multi-epoch Very Long Baseline Array observations of the 22.2GHz H 2O maser emission associated with the "water fountain" IRAS18286-0959. We suggest that this object is the second example of a highly collimated bipolar precessing outflow traced by H 2O maser emission, the other is W43A. The detected H 2O emission peaks are distributed over a velocity range from -50kms -1 to 150kms -1. The spatial distribution of over 70% of the identified maser features is found to be highly collimated along a spiral jet (jet 1) extended southeast to northwest; the remaining features appear to trace another spiral jet (jet 2) with a different orientation. The two jets form a "double-helix" pattern which lies across ∼200 mas. The maser distribution is reasonably fit by a model consisting of two bipolar precessing jets. The three-dimensional velocities of jet 1 and jet 2 are derived to be 138kms -1 and 99kms -1, respectively. The precession period of jet 1 is about 56 years. For jet 2, three possible models are tested and they give different values for the kinematic parameters. We propose that the appearance of two jets is the result of a single driving source with significant proper motion. © 2011. The American Astronomical Society. All rights reserved. | ||||||||||||
Persistent Identifier | http://hdl.handle.net/10722/142476 | ||||||||||||
ISSN | 2023 Impact Factor: 4.8 2023 SCImago Journal Rankings: 1.905 | ||||||||||||
ISI Accession Number ID |
Funding Information: This research is supported by grants from the Research Grants Council of Hong Kong (project code: HKU 703308P, HKU 704209P, HKU 704710P, and HKU 704411P), and the Small Project Funding of The University of Hong Kong (project code: 201007176004). B.Y. acknowledges the support by the HKU SPACE Research Fund. H. I. is financially supported by Grant-in-Aid for Young Scientists from the Ministry of Education, Culture, Sports, Science, and Technology (18740109), as well as by Grant-in-Aid for Scientific Research from Japan Society for Promotion Science (20540234). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. | ||||||||||||
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Grants |
DC Field | Value | Language |
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dc.contributor.author | Yung, BHK | en_HK |
dc.contributor.author | Nakashima, JI | en_HK |
dc.contributor.author | Imai, H | en_HK |
dc.contributor.author | Deguchi, S | en_HK |
dc.contributor.author | Diamond, PJ | en_HK |
dc.contributor.author | Kwok, S | en_HK |
dc.date.accessioned | 2011-10-28T02:46:51Z | - |
dc.date.available | 2011-10-28T02:46:51Z | - |
dc.date.issued | 2011 | en_HK |
dc.identifier.citation | Astrophysical Journal, 2011, v. 741 n. 2 | en_HK |
dc.identifier.issn | 0004-637X | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/142476 | - |
dc.description.abstract | We report the results of multi-epoch Very Long Baseline Array observations of the 22.2GHz H 2O maser emission associated with the "water fountain" IRAS18286-0959. We suggest that this object is the second example of a highly collimated bipolar precessing outflow traced by H 2O maser emission, the other is W43A. The detected H 2O emission peaks are distributed over a velocity range from -50kms -1 to 150kms -1. The spatial distribution of over 70% of the identified maser features is found to be highly collimated along a spiral jet (jet 1) extended southeast to northwest; the remaining features appear to trace another spiral jet (jet 2) with a different orientation. The two jets form a "double-helix" pattern which lies across ∼200 mas. The maser distribution is reasonably fit by a model consisting of two bipolar precessing jets. The three-dimensional velocities of jet 1 and jet 2 are derived to be 138kms -1 and 99kms -1, respectively. The precession period of jet 1 is about 56 years. For jet 2, three possible models are tested and they give different values for the kinematic parameters. We propose that the appearance of two jets is the result of a single driving source with significant proper motion. © 2011. The American Astronomical Society. All rights reserved. | en_HK |
dc.language | eng | en_US |
dc.publisher | Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/ | en_HK |
dc.relation.ispartof | Astrophysical Journal | en_HK |
dc.rights | The Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc. | en_US |
dc.subject | masers | en_HK |
dc.subject | stars: AGB and post-AGB | en_HK |
dc.subject | stars: evolution | en_HK |
dc.subject | stars: winds, outflows | en_HK |
dc.title | High velocity precessing jets from the water fountain IRAS18286-0959 revealed by very long baseline array observations | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=&spage=&epage=&date=2011&atitle=High+Velocity+Precessing+Jets+from+the+Water+Fountain+IRAS+18286-0959+Revealed+by+VLBA+Observations | en_US |
dc.identifier.email | Nakashima, JI: junichi@hku.hk | en_HK |
dc.identifier.email | Kwok, S: deannote@hku.hk | en_HK |
dc.identifier.authority | Nakashima, JI=rp00764 | en_HK |
dc.identifier.authority | Kwok, S=rp00716 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1088/0004-637X/741/2/94 | en_HK |
dc.identifier.scopus | eid_2-s2.0-80155156073 | en_HK |
dc.identifier.hkuros | 196789 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-80155156073&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 741 | en_HK |
dc.identifier.issue | 2 | en_HK |
dc.identifier.isi | WOS:000296771500027 | - |
dc.publisher.place | United States | en_HK |
dc.relation.project | Observational Study of Red Supergiants Embedded in Galactic Young Open Clusters | - |
dc.relation.project | Radio Interferometric Observations of Post-AGB Stars and Proto-Planetary Nebulae | - |
dc.relation.project | Observational Study of Mass-Losing Evolved Stars utilizing Maser Surveys and Newly Released Infrared Data | - |
dc.relation.project | Systematic Study of Circumstellar Maser Sources | - |
dc.identifier.scopusauthorid | Yung, BHK=53985956100 | en_HK |
dc.identifier.scopusauthorid | Nakashima, JI=35485342300 | en_HK |
dc.identifier.scopusauthorid | Imai, H=35484255500 | en_HK |
dc.identifier.scopusauthorid | Deguchi, S=7006314159 | en_HK |
dc.identifier.scopusauthorid | Diamond, PJ=7102763138 | en_HK |
dc.identifier.scopusauthorid | Kwok, S=22980498300 | en_HK |
dc.identifier.issnl | 0004-637X | - |