FLASHING: New high-velocity H2O masers in IRAS 18286−0959

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...

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Authors: Imai, Hiroshi, Uno, Yuri, Maeyama, Daichi, Yamaguchi, Ryosuke, Amada, Kei, Hamae, Yuhki, Orosz, Gabor, Gómez, José F., Tafoya, Daniel, Uscanga, Lucero, Burns, Ross A.
Format: article
Status:Versión aceptada para publicación
Publication Date:2020
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/228177
Online Access:http://hdl.handle.net/10261/228177
Access Level:Open access
Keyword:Masers
Stars: AGB and post-AGB
Stars: individuals (IRAS 18286−0959)
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oai_identifier_str oai:digital.csic.es:10261/228177
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv FLASHING: New high-velocity H2O masers in IRAS 18286−0959
title FLASHING: New high-velocity H2O masers in IRAS 18286−0959
spellingShingle FLASHING: New high-velocity H2O masers in IRAS 18286−0959
Imai, Hiroshi
Masers
Stars: AGB and post-AGB
Stars: individuals (IRAS 18286−0959)
title_short FLASHING: New high-velocity H2O masers in IRAS 18286−0959
title_full FLASHING: New high-velocity H2O masers in IRAS 18286−0959
title_fullStr FLASHING: New high-velocity H2O masers in IRAS 18286−0959
title_full_unstemmed FLASHING: New high-velocity H2O masers in IRAS 18286−0959
title_sort FLASHING: New high-velocity H2O masers in IRAS 18286−0959
dc.creator.none.fl_str_mv Imai, Hiroshi
Uno, Yuri
Maeyama, Daichi
Yamaguchi, Ryosuke
Amada, Kei
Hamae, Yuhki
Orosz, Gabor
Gómez, José F.
Tafoya, Daniel
Uscanga, Lucero
Burns, Ross A.
author Imai, Hiroshi
author_facet Imai, Hiroshi
Uno, Yuri
Maeyama, Daichi
Yamaguchi, Ryosuke
Amada, Kei
Hamae, Yuhki
Orosz, Gabor
Gómez, José F.
Tafoya, Daniel
Uscanga, Lucero
Burns, Ross A.
author_role author
author2 Uno, Yuri
Maeyama, Daichi
Yamaguchi, Ryosuke
Amada, Kei
Hamae, Yuhki
Orosz, Gabor
Gómez, José F.
Tafoya, Daniel
Uscanga, Lucero
Burns, Ross A.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Ministerio de Economía y Competitividad (España)
European Commission
Japan Society for the Promotion of Science
Australian Research Council
National Key Research and Development Program (China)
European Research Council
Universidad de Guanajuato
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Masers
Stars: AGB and post-AGB
Stars: individuals (IRAS 18286−0959)
topic Masers
Stars: AGB and post-AGB
Stars: individuals (IRAS 18286−0959)
description 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. © The Author(s) 2020. Published by Oxford University Press on behalf of the Astronomical Society of Japan.
publishDate 2020
dc.date.none.fl_str_mv 2020
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/228177
url http://hdl.handle.net/10261/228177
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2017-0709
info:eu-repo/grantAgreement/EC/H2020/614264
http://dx.doi.org/10.1093/pasj/psaa047
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
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reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling FLASHING: New high-velocity H2O masers in IRAS 18286−0959Imai, HiroshiUno, YuriMaeyama, DaichiYamaguchi, RyosukeAmada, KeiHamae, YuhkiOrosz, GaborGómez, José F.Tafoya, DanielUscanga, LuceroBurns, Ross A.MasersStars: AGB and post-AGBStars: individuals (IRAS 18286−0959)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. © The Author(s) 2020. Published by Oxford University Press on behalf of the Astronomical Society of Japan.The Nobeyama 45m radio telescope and VERA are operated by Nobeyama Radio Observatory and Mizusawa VLBI Observatory, respectively, branches of National Astronomical Observatory of Japan (NAOJ), National Institutes of Natural Sciences. KVN in KaVA and the Daejeon Correlator in KJCC are operated by Korea Astronomy and Space Science Institute (KASI). Our data analysis was in part carried out on the common use data analysis computer system at the Astronomy Data Center, ADC, of NAOJ. HI and GO are supported by the MEXT KAKENHI program (16H02167). JFG is partially supported by MINECO (Spain) grant AYA2017-84390-C2-R (co-funded by FEDER) and by the State Agency for Research of the Spanish MCIU through the "Center of Excellence Severo Ochoa" award for the Instituto de Astrof ' isica de Andaluc ' ia (SEV-2017-0709). HI and JFG were supported by the Invitation Program for Foreign Researchers of the Japan Society for Promotion of Science (JSPS grant S14128) and i-LINK+2019 Programme in IAA/CSIC. GO was supported by the Australian Research Council Discovery project DP180101061 of the Australian government, and the grants of CAS LCWR 2018-XBQNXZ-B-021 and National Key R&D Program of China 2018YFA0404602. DT was supported by the ERC consolidator grant 614264. RB acknowledges support through the EACOA Fellowship from the East Asian Core Observatories Association. LU acknowledges support from Convocatoria de Apoyo a la Investigacion Cientifica 2020 of the University of Guanajuato.Peer reviewedOxford University PressMinisterio de Ciencia, Innovación y Universidades (España)Ministerio de Economía y Competitividad (España)European CommissionJapan Society for the Promotion of ScienceAustralian Research CouncilNational Key Research and Development Program (China)European Research CouncilUniversidad de GuanajuatoConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202120212020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/228177reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2017-84390-C2-Rinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2017-0709info:eu-repo/grantAgreement/EC/H2020/614264http://dx.doi.org/10.1093/pasj/psaa047Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2281772026-05-22T06:33:51Z
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