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Conference Paper: A high velocity precessing jet from the water fountain IRAS 18286-0959 revealed by VLBA observations

TitleA high velocity precessing jet from the water fountain IRAS 18286-0959 revealed by VLBA observations
Authors
Imai, HYung, HKBNakashima, JDeguchi, SDiamond, PJKwok, S
Issue Date2010
PublisherKagoshima University.
Citation
The 3rd East Asia VLBI Wokshop, Kagoshima, Japan, 22-24 April 2010. In Abstracts of Oral Presentations of the 3rd East Asia VLBI Wokshop, 2010, p. 78 How to Cite?
AbstractWe report the multi-epoch VLBA observations of 22.2 GHz water maser emission associated with the “water fountain” star IRAS 18286－0959. The detected maser emission peaks are distributed in the velocity range from -50 km/s to 150 km/s in the spectra. The distribution of over 70% of the identified maser features are found to be highly collimated along a spiral jet (jet 1) extended from southeast to northwest direction, and the rest of the features seem to trace out another spiral jet (jet 2) with different orientations, forming a “double-helix” pattern. A precessing jet model is proposed to fit the two jets independently. The coefficient of determination of the fitting is -0.85 for jet 1 and -0.51 for jet 2, indicating the model is reliable at least for jet 1. The precession periods and velocities are derived to be 60 years and 170 km/s for jet 1, 40 years and 152 km/s for jet 2, respectively. Owing to the difference between two sets of parameters, the two jets are probably originated from different driving sources visually close to each other. IRAS 18286－0959 is the second example of water fountain which has a collimated precessing outflow other than W 43A.
DescriptionAbstract book distributed at the conference venue at be downloaded at http://milkyway.sci.kagoshima-u.ac.jp/groups/eavws2010/
Persistent Identifierhttp://hdl.handle.net/10722/109774

 

DC FieldValueLanguage
dc.contributor.authorImai, Hen_HK
dc.contributor.authorYung, HKBen_HK
dc.contributor.authorNakashima, Jen_HK
dc.contributor.authorDeguchi, Sen_HK
dc.contributor.authorDiamond, PJen_HK
dc.contributor.authorKwok, Sen_HK
dc.date.accessioned2010-09-26T01:36:42Z-
dc.date.available2010-09-26T01:36:42Z-
dc.date.issued2010en_HK
dc.identifier.citationThe 3rd East Asia VLBI Wokshop, Kagoshima, Japan, 22-24 April 2010. In Abstracts of Oral Presentations of the 3rd East Asia VLBI Wokshop, 2010, p. 78-
dc.identifier.urihttp://hdl.handle.net/10722/109774-
dc.descriptionAbstract book distributed at the conference venue at be downloaded at http://milkyway.sci.kagoshima-u.ac.jp/groups/eavws2010/-
dc.description.abstractWe report the multi-epoch VLBA observations of 22.2 GHz water maser emission associated with the “water fountain” star IRAS 18286－0959. The detected maser emission peaks are distributed in the velocity range from -50 km/s to 150 km/s in the spectra. The distribution of over 70% of the identified maser features are found to be highly collimated along a spiral jet (jet 1) extended from southeast to northwest direction, and the rest of the features seem to trace out another spiral jet (jet 2) with different orientations, forming a “double-helix” pattern. A precessing jet model is proposed to fit the two jets independently. The coefficient of determination of the fitting is -0.85 for jet 1 and -0.51 for jet 2, indicating the model is reliable at least for jet 1. The precession periods and velocities are derived to be 60 years and 170 km/s for jet 1, 40 years and 152 km/s for jet 2, respectively. Owing to the difference between two sets of parameters, the two jets are probably originated from different driving sources visually close to each other. IRAS 18286－0959 is the second example of water fountain which has a collimated precessing outflow other than W 43A.-
dc.languageengen_HK
dc.publisherKagoshima University.-
dc.relation.ispartofAbstracts of Oral Presentations of the 3rd East Asia VLBI Wokshopen_HK
dc.titleA high velocity precessing jet from the water fountain IRAS 18286-0959 revealed by VLBA observationsen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailNakashima, J: junichi@hkucc.hku.hken_HK
dc.identifier.emailKwok, S: sunkwok@hku.hken_HK
dc.identifier.authorityNakashima, J=rp00764en_HK
dc.identifier.authorityKwok, S=rp00716en_HK
dc.identifier.hkuros169781en_HK
dc.identifier.spage78-
dc.identifier.epage78-
dc.publisher.placeKagoshima, Japan-
dc.description.otherThe 3rd East Asia VLBI Wokshop, Kagoshima, Japan, 22-24 April 2010. In Abstracts of Oral Presentations of the 3rd East Asia VLBI Wokshop, 2010, p. 78-

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