A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region

We report multi-epoch Very Long Baseline Interferometry (VLBI) H2O maser observations towards the compact cluster of young stellar objects (YSOs) close to the Herbig Be star LkHα 234. This cluster includes LkHα 234 and at least nine more YSOs that are formed within projected distances of ∼10 arcsec...

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Detalles Bibliográficos
Autores: Torrelles, José M., Curiel, Salvador, Estalella, Robert, Anglada Pons, Guillem Josep, Gómez, José F., Cantó, J., Patel, N. A., Trinidad, M. A., Girart, Josep Miquel, Carrasco-González, Carlos, Rodríguez, Luis F.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/376544
Acceso en línea:http://hdl.handle.net/10261/376544
Access Level:acceso abierto
Palabra clave:Masers – stars: formation
ISM: individual objects: LkHα 234
ISM: jets and outflows
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spelling A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 regionTorrelles, José M.Curiel, SalvadorEstalella, RobertAnglada Pons, Guillem JosepGómez, José F.Cantó, J.Patel, N. A.Trinidad, M. A.Girart, Josep MiquelCarrasco-González, CarlosRodríguez, Luis F.Masers – stars: formationISM: individual objects: LkHα 234ISM: jets and outflowsWe report multi-epoch Very Long Baseline Interferometry (VLBI) H2O maser observations towards the compact cluster of young stellar objects (YSOs) close to the Herbig Be star LkHα 234. This cluster includes LkHα 234 and at least nine more YSOs that are formed within projected distances of ∼10 arcsec (∼9000 au). We detect H2O maser emission towards four of these YSOs. In particular, our VLBI observations (including proper motion measurements) reveal a remarkable very compact (∼0.2 arcsec = ∼180 au), bipolar H2O maser outflow emerging from the embedded YSO Very Large Array (VLA) 2. We estimate a kinematic age of ∼40 yr for this bipolar outflow, with expanding velocities of ∼20 km s-1 and momentum rate Ṁw Vw ≃ 10-4-10-3 M⊙ yr-1 km s-1 × (Ω/4π), powered by a YSO of a few solar masses. We propose that the outflow is produced by recurrent episodic jet ejections associated with the formation of this YSO. Short-lived episodic ejection events have previously been found towards high-mass YSOs. We show now that this behaviour is also present in intermediate-mass YSOs. These short-lived episodic ejections are probably related to episodic increases in the accretion rate, as observed in low-mass YSOs. We predict the presence of an accretion disc associated with VLA 2. If detected, this would represent one of the few known examples of intermediate-mass stars with a disc-YSO-jet system at scales of a few hundred astronomical units. © 2014 The authors PublishedWe are very grateful to Eri Kato for providing us the near- and mid-infrared images shown in this paper (Fig. 1). We thank the referee, Kevin Marvel, for his valuable comments and suggestions on the manuscript. GA, RE, JFG, JMG, and JMT acknowledge the support from MICINN (Spain) AYA2011-30228-C03 grant (co-funded with FEDER funds). JC acknowledges support from CONACyT grant 61547. SC acknowledges the support of DGAPA, UNAM, CONACyT (Mexico), and CSIC (Spain). CC-G and LFR ´ acknowledge the support of DGAPA, UNAM, and CONACyT (Mexico). MAT acknowledges the support from CONACyT grant ´ 82543. JMG, RE, and JMT acknowledge the support from AGAUR (Catalonia) 2009SGR1172 grant. The ICC (UB) is a CSICAssociated Unit through the ICE (CSIC).Peer reviewedOxford University PressMinisterio de Ciencia e Innovación (España)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/376544reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI//AYA2011-30228-C03http://dx.doi.org/10.1093/mnras/stu847Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3765442026-05-22T06:33:51Z
dc.title.none.fl_str_mv A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
title A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
spellingShingle A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
Torrelles, José M.
Masers – stars: formation
ISM: individual objects: LkHα 234
ISM: jets and outflows
title_short A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
title_full A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
title_fullStr A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
title_full_unstemmed A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
title_sort A very young, compact bipolar H2O maser outflow in the intermediate-mass star-forming LkHα 234 region
dc.creator.none.fl_str_mv Torrelles, José M.
Curiel, Salvador
Estalella, Robert
Anglada Pons, Guillem Josep
Gómez, José F.
Cantó, J.
Patel, N. A.
Trinidad, M. A.
Girart, Josep Miquel
Carrasco-González, Carlos
Rodríguez, Luis F.
author Torrelles, José M.
author_facet Torrelles, José M.
Curiel, Salvador
Estalella, Robert
Anglada Pons, Guillem Josep
Gómez, José F.
Cantó, J.
Patel, N. A.
Trinidad, M. A.
Girart, Josep Miquel
Carrasco-González, Carlos
Rodríguez, Luis F.
author_role author
author2 Curiel, Salvador
Estalella, Robert
Anglada Pons, Guillem Josep
Gómez, José F.
Cantó, J.
Patel, N. A.
Trinidad, M. A.
Girart, Josep Miquel
Carrasco-González, Carlos
Rodríguez, Luis F.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Masers – stars: formation
ISM: individual objects: LkHα 234
ISM: jets and outflows
topic Masers – stars: formation
ISM: individual objects: LkHα 234
ISM: jets and outflows
description We report multi-epoch Very Long Baseline Interferometry (VLBI) H2O maser observations towards the compact cluster of young stellar objects (YSOs) close to the Herbig Be star LkHα 234. This cluster includes LkHα 234 and at least nine more YSOs that are formed within projected distances of ∼10 arcsec (∼9000 au). We detect H2O maser emission towards four of these YSOs. In particular, our VLBI observations (including proper motion measurements) reveal a remarkable very compact (∼0.2 arcsec = ∼180 au), bipolar H2O maser outflow emerging from the embedded YSO Very Large Array (VLA) 2. We estimate a kinematic age of ∼40 yr for this bipolar outflow, with expanding velocities of ∼20 km s-1 and momentum rate Ṁw Vw ≃ 10-4-10-3 M⊙ yr-1 km s-1 × (Ω/4π), powered by a YSO of a few solar masses. We propose that the outflow is produced by recurrent episodic jet ejections associated with the formation of this YSO. Short-lived episodic ejection events have previously been found towards high-mass YSOs. We show now that this behaviour is also present in intermediate-mass YSOs. These short-lived episodic ejections are probably related to episodic increases in the accretion rate, as observed in low-mass YSOs. We predict the presence of an accretion disc associated with VLA 2. If detected, this would represent one of the few known examples of intermediate-mass stars with a disc-YSO-jet system at scales of a few hundred astronomical units. © 2014 The authors Published
publishDate 2014
dc.date.none.fl_str_mv 2014
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/376544
url http://hdl.handle.net/10261/376544
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI//AYA2011-30228-C03
http://dx.doi.org/10.1093/mnras/stu847
Sí
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)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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