A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs

Autores
Gomez, Mercedes Nieves; Persi, P.; Marenzi, A. R.; Roth, M.; Tapia, M.
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have obtained narrow-band images of three selected areas of the Chamaeleon I dark cloud which harbor very low mass young stars, centered on the H_2 and Br_gamma lines and neighboring continuum as well as on the broad band K_s. One region is located in the northern part of the cloud, roughly coinciding with the densest area. The other two regions are in the southern section of the cloud. Our aim is to search for H_2 outflows associated with these objects. In the northern region, we found seven new H_2 knots, five of which are aligned in the direction of a previously known 12^CO molecular bipolar outflow. Further evidence that the class I low mass stellar object ISO-ChaI 192 is the driving source of the molecular flow is given by the presence of a 960 AU long elongated structure at 2.2 micron emanating from this star and oriented parallel to the bipolar structure. Another pair of H_2 knots, although lying relatively nearby, is not aligned with the outflow direction. They are located on opposite sides of C1-6, a low mass class II object in the northern part of the Chamaeleon I dark cloud. In contrast, we fail to detect any H_2 emission object brighter than our sensitivity limit (about 6 x 10^-32 W/m^2 Hz arcsec^2) in the two southern areas of the cloud that also harbor several very low mass stars, including two transition stellar/sub-stellar objects. This negative result is probably not surprising in view of the extremely low accretion rates measured for brown dwarfs (M_dot = 10^-12 -- 10^-9 M_sun yr^-1). Deeper H_2 observations are required to better constraint the outflow event in sub-stellar objects.
Fil: Gomez, Mercedes Nieves. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Persi, P.. Centre National de la Recherche Scientifique; Francia. Istituto Astrofisica Spaziale e Fisica Cosmica; Italia
Fil: Marenzi, A. R.. Centre National de la Recherche Scientifique; Francia. Istituto Astrofisica Spaziale e Fisica Cosmica; Italia
Fil: Roth, M.. Carnegie Institution of Washington; Estados Unidos
Fil: Tapia, M.. Universidad Nacional Autónoma de México. Instituto de Astronomía; México
Materia
STARS: FORMATION
STARS: LOW MASS, BROWN DWARFS
ISM: JETS AND OUTFLOWS
ISM: INDIVIDUAL OBJETS: CHAMAELEON I
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/241759
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/241759
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOsGomez, Mercedes NievesPersi, P.Marenzi, A. R.Roth, M.Tapia, M.STARS: FORMATIONSTARS: LOW MASS, BROWN DWARFSISM: JETS AND OUTFLOWSISM: INDIVIDUAL OBJETS: CHAMAELEON Ihttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We have obtained narrow-band images of three selected areas of the Chamaeleon I dark cloud which harbor very low mass young stars, centered on the H_2 and Br_gamma lines and neighboring continuum as well as on the broad band K_s. One region is located in the northern part of the cloud, roughly coinciding with the densest area. The other two regions are in the southern section of the cloud. Our aim is to search for H_2 outflows associated with these objects. In the northern region, we found seven new H_2 knots, five of which are aligned in the direction of a previously known 12^CO molecular bipolar outflow. Further evidence that the class I low mass stellar object ISO-ChaI 192 is the driving source of the molecular flow is given by the presence of a 960 AU long elongated structure at 2.2 micron emanating from this star and oriented parallel to the bipolar structure. Another pair of H_2 knots, although lying relatively nearby, is not aligned with the outflow direction. They are located on opposite sides of C1-6, a low mass class II object in the northern part of the Chamaeleon I dark cloud. In contrast, we fail to detect any H_2 emission object brighter than our sensitivity limit (about 6 x 10^-32 W/m^2 Hz arcsec^2) in the two southern areas of the cloud that also harbor several very low mass stars, including two transition stellar/sub-stellar objects. This negative result is probably not surprising in view of the extremely low accretion rates measured for brown dwarfs (M_dot = 10^-12 -- 10^-9 M_sun yr^-1). Deeper H_2 observations are required to better constraint the outflow event in sub-stellar objects.Fil: Gomez, Mercedes Nieves. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Persi, P.. Centre National de la Recherche Scientifique; Francia. Istituto Astrofisica Spaziale e Fisica Cosmica; ItaliaFil: Marenzi, A. R.. Centre National de la Recherche Scientifique; Francia. Istituto Astrofisica Spaziale e Fisica Cosmica; ItaliaFil: Roth, M.. Carnegie Institution of Washington; Estados UnidosFil: Tapia, M.. Universidad Nacional Autónoma de México. Instituto de Astronomía; MéxicoEDP Sciences2004-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/241759Gomez, Mercedes Nieves; Persi, P.; Marenzi, A. R.; Roth, M.; Tapia, M.; A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs; EDP Sciences; Astronomy and Astrophysics; 423; 2; 8-2004; 629-6410004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2004/32/aa0173-04/aa0173-04.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20047173info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:15:24Zoai:ri.conicet.gov.ar:11336/241759instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:15:24.394CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
title A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
spellingShingle A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
Gomez, Mercedes Nieves
STARS: FORMATION
STARS: LOW MASS, BROWN DWARFS
ISM: JETS AND OUTFLOWS
ISM: INDIVIDUAL OBJETS: CHAMAELEON I
title_short A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
title_full A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
title_fullStr A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
title_full_unstemmed A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
title_sort A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs
dc.creator.none.fl_str_mv Gomez, Mercedes Nieves
Persi, P.
Marenzi, A. R.
Roth, M.
Tapia, M.
author Gomez, Mercedes Nieves
author_facet Gomez, Mercedes Nieves
Persi, P.
Marenzi, A. R.
Roth, M.
Tapia, M.
author_role author
author2 Persi, P.
Marenzi, A. R.
Roth, M.
Tapia, M.
author2_role author
author
author
author
dc.subject.none.fl_str_mv STARS: FORMATION
STARS: LOW MASS, BROWN DWARFS
ISM: JETS AND OUTFLOWS
ISM: INDIVIDUAL OBJETS: CHAMAELEON I
topic STARS: FORMATION
STARS: LOW MASS, BROWN DWARFS
ISM: JETS AND OUTFLOWS
ISM: INDIVIDUAL OBJETS: CHAMAELEON I
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We have obtained narrow-band images of three selected areas of the Chamaeleon I dark cloud which harbor very low mass young stars, centered on the H_2 and Br_gamma lines and neighboring continuum as well as on the broad band K_s. One region is located in the northern part of the cloud, roughly coinciding with the densest area. The other two regions are in the southern section of the cloud. Our aim is to search for H_2 outflows associated with these objects. In the northern region, we found seven new H_2 knots, five of which are aligned in the direction of a previously known 12^CO molecular bipolar outflow. Further evidence that the class I low mass stellar object ISO-ChaI 192 is the driving source of the molecular flow is given by the presence of a 960 AU long elongated structure at 2.2 micron emanating from this star and oriented parallel to the bipolar structure. Another pair of H_2 knots, although lying relatively nearby, is not aligned with the outflow direction. They are located on opposite sides of C1-6, a low mass class II object in the northern part of the Chamaeleon I dark cloud. In contrast, we fail to detect any H_2 emission object brighter than our sensitivity limit (about 6 x 10^-32 W/m^2 Hz arcsec^2) in the two southern areas of the cloud that also harbor several very low mass stars, including two transition stellar/sub-stellar objects. This negative result is probably not surprising in view of the extremely low accretion rates measured for brown dwarfs (M_dot = 10^-12 -- 10^-9 M_sun yr^-1). Deeper H_2 observations are required to better constraint the outflow event in sub-stellar objects.
Fil: Gomez, Mercedes Nieves. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Persi, P.. Centre National de la Recherche Scientifique; Francia. Istituto Astrofisica Spaziale e Fisica Cosmica; Italia
Fil: Marenzi, A. R.. Centre National de la Recherche Scientifique; Francia. Istituto Astrofisica Spaziale e Fisica Cosmica; Italia
Fil: Roth, M.. Carnegie Institution of Washington; Estados Unidos
Fil: Tapia, M.. Universidad Nacional Autónoma de México. Instituto de Astronomía; México
description We have obtained narrow-band images of three selected areas of the Chamaeleon I dark cloud which harbor very low mass young stars, centered on the H_2 and Br_gamma lines and neighboring continuum as well as on the broad band K_s. One region is located in the northern part of the cloud, roughly coinciding with the densest area. The other two regions are in the southern section of the cloud. Our aim is to search for H_2 outflows associated with these objects. In the northern region, we found seven new H_2 knots, five of which are aligned in the direction of a previously known 12^CO molecular bipolar outflow. Further evidence that the class I low mass stellar object ISO-ChaI 192 is the driving source of the molecular flow is given by the presence of a 960 AU long elongated structure at 2.2 micron emanating from this star and oriented parallel to the bipolar structure. Another pair of H_2 knots, although lying relatively nearby, is not aligned with the outflow direction. They are located on opposite sides of C1-6, a low mass class II object in the northern part of the Chamaeleon I dark cloud. In contrast, we fail to detect any H_2 emission object brighter than our sensitivity limit (about 6 x 10^-32 W/m^2 Hz arcsec^2) in the two southern areas of the cloud that also harbor several very low mass stars, including two transition stellar/sub-stellar objects. This negative result is probably not surprising in view of the extremely low accretion rates measured for brown dwarfs (M_dot = 10^-12 -- 10^-9 M_sun yr^-1). Deeper H_2 observations are required to better constraint the outflow event in sub-stellar objects.
publishDate 2004
dc.date.none.fl_str_mv 2004-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/241759
Gomez, Mercedes Nieves; Persi, P.; Marenzi, A. R.; Roth, M.; Tapia, M.; A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs; EDP Sciences; Astronomy and Astrophysics; 423; 2; 8-2004; 629-641
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/241759
identifier_str_mv Gomez, Mercedes Nieves; Persi, P.; Marenzi, A. R.; Roth, M.; Tapia, M.; A search for shock-excited molecular hydrogen knots in Chamaeleon I very low mass YSOs; EDP Sciences; Astronomy and Astrophysics; 423; 2; 8-2004; 629-641
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2004/32/aa0173-04/aa0173-04.html
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20047173
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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