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Article: High velocity precessing jets from the water fountain IRAS18286-0959 revealed by very long baseline array observations

TitleHigh velocity precessing jets from the water fountain IRAS18286-0959 revealed by very long baseline array observations
Authors
Keywordsmasers
stars: AGB and post-AGB
stars: evolution
stars: winds, outflows
Issue Date2011
PublisherInstitute 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?
AbstractWe 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 Identifierhttp://hdl.handle.net/10722/142476
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongHKU 703308P
HKU 704209P
HKU 704710P
HKU 704411P
University of Hong Kong201007176004
HKU SPACE
Ministry of Education, Culture, Sports, Science, and Technology18740109
Japan Society for Promotion Science20540234
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.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorYung, BHKen_HK
dc.contributor.authorNakashima, JIen_HK
dc.contributor.authorImai, Hen_HK
dc.contributor.authorDeguchi, Sen_HK
dc.contributor.authorDiamond, PJen_HK
dc.contributor.authorKwok, Sen_HK
dc.date.accessioned2011-10-28T02:46:51Z-
dc.date.available2011-10-28T02:46:51Z-
dc.date.issued2011en_HK
dc.identifier.citationAstrophysical Journal, 2011, v. 741 n. 2en_HK
dc.identifier.issn0004-637Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/142476-
dc.description.abstractWe 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.languageengen_US
dc.publisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/en_HK
dc.relation.ispartofAstrophysical Journalen_HK
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.en_US
dc.subjectmasersen_HK
dc.subjectstars: AGB and post-AGBen_HK
dc.subjectstars: evolutionen_HK
dc.subjectstars: winds, outflowsen_HK
dc.titleHigh velocity precessing jets from the water fountain IRAS18286-0959 revealed by very long baseline array observationsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://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+Observationsen_US
dc.identifier.emailNakashima, JI: junichi@hku.hken_HK
dc.identifier.emailKwok, S: deannote@hku.hken_HK
dc.identifier.authorityNakashima, JI=rp00764en_HK
dc.identifier.authorityKwok, S=rp00716en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0004-637X/741/2/94en_HK
dc.identifier.scopuseid_2-s2.0-80155156073en_HK
dc.identifier.hkuros196789en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80155156073&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume741en_HK
dc.identifier.issue2en_HK
dc.identifier.isiWOS:000296771500027-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectObservational Study of Red Supergiants Embedded in Galactic Young Open Clusters-
dc.relation.projectRadio Interferometric Observations of Post-AGB Stars and Proto-Planetary Nebulae-
dc.relation.projectObservational Study of Mass-Losing Evolved Stars utilizing Maser Surveys and Newly Released Infrared Data-
dc.relation.projectSystematic Study of Circumstellar Maser Sources-
dc.identifier.scopusauthoridYung, BHK=53985956100en_HK
dc.identifier.scopusauthoridNakashima, JI=35485342300en_HK
dc.identifier.scopusauthoridImai, H=35484255500en_HK
dc.identifier.scopusauthoridDeguchi, S=7006314159en_HK
dc.identifier.scopusauthoridDiamond, PJ=7102763138en_HK
dc.identifier.scopusauthoridKwok, S=22980498300en_HK

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