New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments

Autores
Dewangan, L. K.; Ojha, D. K.; Sharma, Saurabh; del Palacio, Santiago; Bhadari, N. K.; Das, A.
Año de publicación
2020
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present an analysis of multiwavelength observations of an area of 0.°27 × 0.°27 around the Galactic H ii region G18.88-0.49, which is powered by an O-type star (age ∼ 105 yr). The Herschel column density map reveals a shell-like feature of extension ∼12 pc × 7 pc and mass ∼2.9 × 104 M o˙ around the H ii region; its existence is further confirmed by the distribution of molecular (12CO, 13CO, C18O, and NH3) gas at [60, 70] km s-1. Four subregions are studied toward this shell-like feature and show a mass range of ∼0.8-10.5 × 103 M o˙. These subregions associated with dense gas are dominated by nonthermal pressure and supersonic nonthermal motions. The shell-like feature is associated with the H ii region, Class I protostars, and a massive protostar candidate, illustrating the ongoing early phases of star formation (including massive stars). The massive protostar is found toward the position of the 6.7 GHz methanol maser, and is associated with outflow activity. Five parsec-scale filaments are identified in the column density and molecular maps and appear to be radially directed to the dense parts of the shell-like feature. This configuration is referred to as a "hub-filament"system. Significant velocity gradients (0.8-1.8 km s-1 pc-1) are observed along each filament, suggesting that the molecular gas flows toward the central hub along the filaments. Overall, our observational findings favor a global nonisotropic collapse scenario as discussed in Motte et al., which can explain the observed morphology and star formation in and around G18.88-0.49.
Fil: Dewangan, L. K.. Physical Research Laboratory India; India
Fil: Ojha, D. K.. International Centre Of Theoretical Science. Tata Institute Of Fundamental Research; España
Fil: Sharma, Saurabh. Aryabhatta Research Institute Of Observational Sciences; India
Fil: del Palacio, Santiago. Universidad Nacional de La Plata; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Bhadari, N. K.. Indian Institute Of Technology Gandhinagar; India. Physical Research Laboratory India; India
Fil: Das, A.. University Of Hyderabad; India
Materia
H II regions
Interstellar medium
Star formation
Pre-main sequence stars
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:11336/138510
Acceder
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network_name_str CONICET Digital (CONICET)
spelling New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting FilamentsDewangan, L. K.Ojha, D. K.Sharma, Saurabhdel Palacio, SantiagoBhadari, N. K.Das, A.H II regionsInterstellar mediumStar formationPre-main sequence starshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present an analysis of multiwavelength observations of an area of 0.°27 × 0.°27 around the Galactic H ii region G18.88-0.49, which is powered by an O-type star (age ∼ 105 yr). The Herschel column density map reveals a shell-like feature of extension ∼12 pc × 7 pc and mass ∼2.9 × 104 M o˙ around the H ii region; its existence is further confirmed by the distribution of molecular (12CO, 13CO, C18O, and NH3) gas at [60, 70] km s-1. Four subregions are studied toward this shell-like feature and show a mass range of ∼0.8-10.5 × 103 M o˙. These subregions associated with dense gas are dominated by nonthermal pressure and supersonic nonthermal motions. The shell-like feature is associated with the H ii region, Class I protostars, and a massive protostar candidate, illustrating the ongoing early phases of star formation (including massive stars). The massive protostar is found toward the position of the 6.7 GHz methanol maser, and is associated with outflow activity. Five parsec-scale filaments are identified in the column density and molecular maps and appear to be radially directed to the dense parts of the shell-like feature. This configuration is referred to as a "hub-filament"system. Significant velocity gradients (0.8-1.8 km s-1 pc-1) are observed along each filament, suggesting that the molecular gas flows toward the central hub along the filaments. Overall, our observational findings favor a global nonisotropic collapse scenario as discussed in Motte et al., which can explain the observed morphology and star formation in and around G18.88-0.49.Fil: Dewangan, L. K.. Physical Research Laboratory India; IndiaFil: Ojha, D. K.. International Centre Of Theoretical Science. Tata Institute Of Fundamental Research; EspañaFil: Sharma, Saurabh. Aryabhatta Research Institute Of Observational Sciences; IndiaFil: del Palacio, Santiago. Universidad Nacional de La Plata; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Bhadari, N. K.. Indian Institute Of Technology Gandhinagar; India. Physical Research Laboratory India; IndiaFil: Das, A.. University Of Hyderabad; IndiaIOP Publishing2020-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/138510Dewangan, L. K.; Ojha, D. K.; Sharma, Saurabh; del Palacio, Santiago; Bhadari, N. K.; et al.; New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments; IOP Publishing; Astrophysical Journal; 903; 1; 11-20200004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/abb827info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/abb827info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:37:24Zoai:ri.conicet.gov.ar:11336/138510instacron: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 10:37:24.4CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
title New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
spellingShingle New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
Dewangan, L. K.
H II regions
Interstellar medium
Star formation
Pre-main sequence stars
title_short New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
title_full New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
title_fullStr New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
title_full_unstemmed New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
title_sort New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments
dc.creator.none.fl_str_mv Dewangan, L. K.
Ojha, D. K.
Sharma, Saurabh
del Palacio, Santiago
Bhadari, N. K.
Das, A.
author Dewangan, L. K.
author_facet Dewangan, L. K.
Ojha, D. K.
Sharma, Saurabh
del Palacio, Santiago
Bhadari, N. K.
Das, A.
author_role author
author2 Ojha, D. K.
Sharma, Saurabh
del Palacio, Santiago
Bhadari, N. K.
Das, A.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv H II regions
Interstellar medium
Star formation
Pre-main sequence stars
topic H II regions
Interstellar medium
Star formation
Pre-main sequence stars
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 an analysis of multiwavelength observations of an area of 0.°27 × 0.°27 around the Galactic H ii region G18.88-0.49, which is powered by an O-type star (age ∼ 105 yr). The Herschel column density map reveals a shell-like feature of extension ∼12 pc × 7 pc and mass ∼2.9 × 104 M o˙ around the H ii region; its existence is further confirmed by the distribution of molecular (12CO, 13CO, C18O, and NH3) gas at [60, 70] km s-1. Four subregions are studied toward this shell-like feature and show a mass range of ∼0.8-10.5 × 103 M o˙. These subregions associated with dense gas are dominated by nonthermal pressure and supersonic nonthermal motions. The shell-like feature is associated with the H ii region, Class I protostars, and a massive protostar candidate, illustrating the ongoing early phases of star formation (including massive stars). The massive protostar is found toward the position of the 6.7 GHz methanol maser, and is associated with outflow activity. Five parsec-scale filaments are identified in the column density and molecular maps and appear to be radially directed to the dense parts of the shell-like feature. This configuration is referred to as a "hub-filament"system. Significant velocity gradients (0.8-1.8 km s-1 pc-1) are observed along each filament, suggesting that the molecular gas flows toward the central hub along the filaments. Overall, our observational findings favor a global nonisotropic collapse scenario as discussed in Motte et al., which can explain the observed morphology and star formation in and around G18.88-0.49.
Fil: Dewangan, L. K.. Physical Research Laboratory India; India
Fil: Ojha, D. K.. International Centre Of Theoretical Science. Tata Institute Of Fundamental Research; España
Fil: Sharma, Saurabh. Aryabhatta Research Institute Of Observational Sciences; India
Fil: del Palacio, Santiago. Universidad Nacional de La Plata; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Bhadari, N. K.. Indian Institute Of Technology Gandhinagar; India. Physical Research Laboratory India; India
Fil: Das, A.. University Of Hyderabad; India
description We present an analysis of multiwavelength observations of an area of 0.°27 × 0.°27 around the Galactic H ii region G18.88-0.49, which is powered by an O-type star (age ∼ 105 yr). The Herschel column density map reveals a shell-like feature of extension ∼12 pc × 7 pc and mass ∼2.9 × 104 M o˙ around the H ii region; its existence is further confirmed by the distribution of molecular (12CO, 13CO, C18O, and NH3) gas at [60, 70] km s-1. Four subregions are studied toward this shell-like feature and show a mass range of ∼0.8-10.5 × 103 M o˙. These subregions associated with dense gas are dominated by nonthermal pressure and supersonic nonthermal motions. The shell-like feature is associated with the H ii region, Class I protostars, and a massive protostar candidate, illustrating the ongoing early phases of star formation (including massive stars). The massive protostar is found toward the position of the 6.7 GHz methanol maser, and is associated with outflow activity. Five parsec-scale filaments are identified in the column density and molecular maps and appear to be radially directed to the dense parts of the shell-like feature. This configuration is referred to as a "hub-filament"system. Significant velocity gradients (0.8-1.8 km s-1 pc-1) are observed along each filament, suggesting that the molecular gas flows toward the central hub along the filaments. Overall, our observational findings favor a global nonisotropic collapse scenario as discussed in Motte et al., which can explain the observed morphology and star formation in and around G18.88-0.49.
publishDate 2020
dc.date.none.fl_str_mv 2020-11
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/11336/138510
Dewangan, L. K.; Ojha, D. K.; Sharma, Saurabh; del Palacio, Santiago; Bhadari, N. K.; et al.; New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments; IOP Publishing; Astrophysical Journal; 903; 1; 11-2020
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/138510
identifier_str_mv Dewangan, L. K.; Ojha, D. K.; Sharma, Saurabh; del Palacio, Santiago; Bhadari, N. K.; et al.; New Insights into the HII Region G18.88-0.49: Hub-Filament System and Accreting Filaments; IOP Publishing; Astrophysical Journal; 903; 1; 11-2020
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/abb827
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/abb827
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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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