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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/215282
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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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1844614213178228736 |
score |
13.070432 |