Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372

Autores
Smith, Nathan; Barba, Rodolfo Héctor; Walborn, Nolan Revere
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present Hubble Space Telescope Wide Field Planetary Camera 2 images of a prominent externally ionized molecular globule in the Carina Nebula (NGC 3372), supplemented with ground-based infrared images and visual-wavelength spectra. This molecular globule has a shape resembling a human hand, with an extended finger that points toward its likely source of ionizing radiation. Following an analysis of the spatially resolved ionization structure and spectrum of the photoevaporative flow from the Finger, we conclude that the dominant ionizing source is either the WNL star WR25 (HD 93162), the adjacent O4 If-type star Trl6-244, or perhaps both. We estimate a mass-loss rate of ∼2 × 10-5 M⊙ yr-1 from the main evaporating surface of the globule, suggesting a remaining lifetime of 10 5.3-106 yr. We find a total mass for the entire globule of more than 6 M⊙ , in agreement with previous estimates. The hydrogen column density through the globule derived from extinction measurements is a few times 1022 cm-2, so the photodissociation region behind the ionization front should be limited to a thin layer compared to the size of the globule, in agreement with the morphology seen in H2 images. Although a few reddened stars are seen within the boundary of the globule in near-infrared continuum images, these may be background stars. We do not detect a reddened star at the apex of the finger, for example, down to a limiting magnitude of mk≃ 17. However, considering the physical properties of the globule and the advancing ionization front, it appears that future star formation is likely in the Finger globule, induced by radiation-driven implosion.
Fil: Smith, Nathan. State University of Colorado at Boulder; Estados Unidos
Fil: Barba, Rodolfo Héctor. Universidad de La Serena; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Walborn, Nolan Revere. Space Telescope Science Institute; Estados Unidos
Materia
ISM: GLOBULES - H II REGIONS
ISM: INDIVIDUAL: NGC 3372
STARS: FORMATION
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:11336/215282

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spelling Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372Smith, NathanBarba, Rodolfo HéctorWalborn, Nolan RevereISM: GLOBULES - H II REGIONSISM: INDIVIDUAL: NGC 3372STARS: FORMATIONhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present Hubble Space Telescope Wide Field Planetary Camera 2 images of a prominent externally ionized molecular globule in the Carina Nebula (NGC 3372), supplemented with ground-based infrared images and visual-wavelength spectra. This molecular globule has a shape resembling a human hand, with an extended finger that points toward its likely source of ionizing radiation. Following an analysis of the spatially resolved ionization structure and spectrum of the photoevaporative flow from the Finger, we conclude that the dominant ionizing source is either the WNL star WR25 (HD 93162), the adjacent O4 If-type star Trl6-244, or perhaps both. We estimate a mass-loss rate of ∼2 × 10-5 M⊙ yr-1 from the main evaporating surface of the globule, suggesting a remaining lifetime of 10 5.3-106 yr. We find a total mass for the entire globule of more than 6 M⊙ , in agreement with previous estimates. The hydrogen column density through the globule derived from extinction measurements is a few times 1022 cm-2, so the photodissociation region behind the ionization front should be limited to a thin layer compared to the size of the globule, in agreement with the morphology seen in H2 images. Although a few reddened stars are seen within the boundary of the globule in near-infrared continuum images, these may be background stars. We do not detect a reddened star at the apex of the finger, for example, down to a limiting magnitude of mk≃ 17. However, considering the physical properties of the globule and the advancing ionization front, it appears that future star formation is likely in the Finger globule, induced by radiation-driven implosion.Fil: Smith, Nathan. State University of Colorado at Boulder; Estados UnidosFil: Barba, Rodolfo Héctor. Universidad de La Serena; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Walborn, Nolan Revere. Space Telescope Science Institute; Estados UnidosWiley Blackwell Publishing, Inc2004-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/215282Smith, Nathan; Barba, Rodolfo Héctor; Walborn, Nolan Revere; Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 351; 4; 12-2004; 1457-14700035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2004.07894.xinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/351/4/1457/1135777info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:22:14Zoai:ri.conicet.gov.ar:11336/215282instacron: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 10:22:14.723CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
title Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
spellingShingle Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
Smith, Nathan
ISM: GLOBULES - H II REGIONS
ISM: INDIVIDUAL: NGC 3372
STARS: FORMATION
title_short Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
title_full Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
title_fullStr Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
title_full_unstemmed Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
title_sort Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372
dc.creator.none.fl_str_mv Smith, Nathan
Barba, Rodolfo Héctor
Walborn, Nolan Revere
author Smith, Nathan
author_facet Smith, Nathan
Barba, Rodolfo Héctor
Walborn, Nolan Revere
author_role author
author2 Barba, Rodolfo Héctor
Walborn, Nolan Revere
author2_role author
author
dc.subject.none.fl_str_mv ISM: GLOBULES - H II REGIONS
ISM: INDIVIDUAL: NGC 3372
STARS: FORMATION
topic ISM: GLOBULES - H II REGIONS
ISM: INDIVIDUAL: NGC 3372
STARS: FORMATION
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 present Hubble Space Telescope Wide Field Planetary Camera 2 images of a prominent externally ionized molecular globule in the Carina Nebula (NGC 3372), supplemented with ground-based infrared images and visual-wavelength spectra. This molecular globule has a shape resembling a human hand, with an extended finger that points toward its likely source of ionizing radiation. Following an analysis of the spatially resolved ionization structure and spectrum of the photoevaporative flow from the Finger, we conclude that the dominant ionizing source is either the WNL star WR25 (HD 93162), the adjacent O4 If-type star Trl6-244, or perhaps both. We estimate a mass-loss rate of ∼2 × 10-5 M⊙ yr-1 from the main evaporating surface of the globule, suggesting a remaining lifetime of 10 5.3-106 yr. We find a total mass for the entire globule of more than 6 M⊙ , in agreement with previous estimates. The hydrogen column density through the globule derived from extinction measurements is a few times 1022 cm-2, so the photodissociation region behind the ionization front should be limited to a thin layer compared to the size of the globule, in agreement with the morphology seen in H2 images. Although a few reddened stars are seen within the boundary of the globule in near-infrared continuum images, these may be background stars. We do not detect a reddened star at the apex of the finger, for example, down to a limiting magnitude of mk≃ 17. However, considering the physical properties of the globule and the advancing ionization front, it appears that future star formation is likely in the Finger globule, induced by radiation-driven implosion.
Fil: Smith, Nathan. State University of Colorado at Boulder; Estados Unidos
Fil: Barba, Rodolfo Héctor. Universidad de La Serena; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Walborn, Nolan Revere. Space Telescope Science Institute; Estados Unidos
description We present Hubble Space Telescope Wide Field Planetary Camera 2 images of a prominent externally ionized molecular globule in the Carina Nebula (NGC 3372), supplemented with ground-based infrared images and visual-wavelength spectra. This molecular globule has a shape resembling a human hand, with an extended finger that points toward its likely source of ionizing radiation. Following an analysis of the spatially resolved ionization structure and spectrum of the photoevaporative flow from the Finger, we conclude that the dominant ionizing source is either the WNL star WR25 (HD 93162), the adjacent O4 If-type star Trl6-244, or perhaps both. We estimate a mass-loss rate of ∼2 × 10-5 M⊙ yr-1 from the main evaporating surface of the globule, suggesting a remaining lifetime of 10 5.3-106 yr. We find a total mass for the entire globule of more than 6 M⊙ , in agreement with previous estimates. The hydrogen column density through the globule derived from extinction measurements is a few times 1022 cm-2, so the photodissociation region behind the ionization front should be limited to a thin layer compared to the size of the globule, in agreement with the morphology seen in H2 images. Although a few reddened stars are seen within the boundary of the globule in near-infrared continuum images, these may be background stars. We do not detect a reddened star at the apex of the finger, for example, down to a limiting magnitude of mk≃ 17. However, considering the physical properties of the globule and the advancing ionization front, it appears that future star formation is likely in the Finger globule, induced by radiation-driven implosion.
publishDate 2004
dc.date.none.fl_str_mv 2004-12
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/11336/215282
Smith, Nathan; Barba, Rodolfo Héctor; Walborn, Nolan Revere; Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 351; 4; 12-2004; 1457-1470
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/215282
identifier_str_mv Smith, Nathan; Barba, Rodolfo Héctor; Walborn, Nolan Revere; Carina's defiant finger: HST observations of a photoevaporating globule in NGC 3372; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 351; 4; 12-2004; 1457-1470
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2004.07894.x
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/351/4/1457/1135777
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 Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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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