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FLASHING: New high-...
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Imai, H.Kagoshima University
(author)
FLASHING: New high-velocity H2O masers in IRAS 18286−0959
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-06-05
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Oxford University Press (OUP),2020
Numbers
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LIBRIS-ID:oai:research.chalmers.se:c6698180-2ca4-4bf1-97f6-9853fc9c0773
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https://doi.org/10.1093/pasj/psaa047DOI
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https://research.chalmers.se/publication/521055URI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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We discovered new high-velocity components of H2O maser emission in one of the “water fountain” sources, IRAS 18286−0959, which has been monitored using the Nobeyama 45 m telescope in the FLASHING (Finest Legacy Acquisitions of SiO- and H2O-maser Ignitions by Nobeyama Generation) project since 2018 December. The maser spectra show new components with extremely high expansion velocities (>200 km s−1 projected in the line of sight), some of which are located symmetrically in the spectrum with respect to the systemic velocity. They were also mapped with KaVA (KVN and VERA Combined Array) in 2019 March. We located some of these maser components closer to the central stellar system than other high-velocity components (50-200 km s−1) that have been confirmed to be associated with the known bipolar outflow. The new components would have flashed in the fast collimated jet at a speed of over 300 km s−1 (soon) after 2011 when they had not been detected. The fastest of the new components seem to indicate rapid deceleration in these spectra; however, our present monitoring is still too sparse to unambiguously confirm it (up to 50 km s−1 yr−1) and too short to reveal their terminal expansion velocity, which will be equal to the expansion velocity that has been observed (vexp ∼ 120 km s−1). Future occurrences of such extreme-velocity components may provide a good opportunity to investigate possible recurrent outflow ignitions. Thus, the sculpture of the parental envelope will be traced by the dense gas that is entrained by the fast jet and exhibits spectacular distributions of the relatively stable maser features.
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Uno, YuriKagoshima University
(author)
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Maeyama, DaichiKagoshima University
(author)
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Yamaguchi, RyosukeKagoshima University
(author)
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Amada, KeiKagoshima University
(author)
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Hamae, YuhkiKagoshima University
(author)
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Orosz, G.University of Tasmania,Chinese Academy of Sciences
(author)
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Gomez, J. F.Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
(author)
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Tafoya, Daniel,1981Chalmers tekniska högskola,Chalmers University of Technology,National Astronomical Observatory of Japan(Swepub:cth)tafoya
(author)
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Uscanga, L.Universidad de Guanajuato
(author)
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Burns, R. A.National Astronomical Observatory of Japan,Korea Astronomy and Space Science Institute
(author)
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Kagoshima UniversityUniversity of Tasmania
(creator_code:org_t)
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In:Publication of the Astronomical Society of Japan: Oxford University Press (OUP)72:42053-051X0004-6264
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Imai, H.
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Uno, Yuri
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Maeyama, Daichi
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Hamae, Yuhki
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Orosz, G.
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