A 12CO (J = 1 → 0) study towards the Ara OB1 region

Autores
Arnal, Edmundo Marcelo; May, J.; Romero, Gustavo Esteban
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Intermediate angular resolution (HPBW = 8′.7) carbon monoxide (12CO J = 1 → 0) line observations towards the OB association Ara OB1 are reported. The molecular line observations cover an area of 2°.75 × 3°.00, and disclose a rich and complex distribution of the molecular line emission. The molecular features likely to be associated with the OB-association Ara OB1 span the velocity range from -28 to -20 km s-1. The most negative radial velocities are observed along NGC 6188 (≡Rim nebula). This nebula marks the interface between the HII region RCW 108 and the highly absorbing molecular material located westwards of the ionised region. The dominant CO structures, labeled E and F, have a radial velocity of about -23.5 and -21.8 km s-1, respectively. The former harbours a bright optical knot, the infrared cluster RCW-108 and the strong IRAS source 16362-4845. IRAS point sources are also seen in projection onto 12CO concentrations F and H. This may indicate that the star forming process is a widespread phenomenon in this molecular complex. Extended continuum emission, having a high degree of spatial correlation with both the infrared and molecular emission, is observed in the region. We believe that this emission, thermal in nature, arises from the ionised surface layers of the molecular complex. The ionising agents are the high mass stars of NGC6193, the nucleus of Ara OB1. The total amount of molecular gas related to Ara OB1 is about ∼1.4×104 M⊙.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto Argentino de Radioastronomía
Materia
Ciencias Astronómicas
HII regions: individual: RCW 108
ISM: molecules
Open clusters and associations: individual: Ara OB1
Open clusters and associations: individual: NGC 6193
Radio continuum: ISM
Radio lines: ISM
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84499

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/84499
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling A 12CO (J = 1 → 0) study towards the Ara OB1 regionArnal, Edmundo MarceloMay, J.Romero, Gustavo EstebanCiencias AstronómicasHII regions: individual: RCW 108ISM: moleculesOpen clusters and associations: individual: Ara OB1Open clusters and associations: individual: NGC 6193Radio continuum: ISMRadio lines: ISMIntermediate angular resolution (HPBW = 8′.7) carbon monoxide (<SUP>12</SUP>CO J = 1 → 0) line observations towards the OB association Ara OB1 are reported. The molecular line observations cover an area of 2°.75 × 3°.00, and disclose a rich and complex distribution of the molecular line emission. The molecular features likely to be associated with the OB-association Ara OB1 span the velocity range from -28 to -20 km s<SUP>-1</SUP>. The most negative radial velocities are observed along NGC 6188 (≡Rim nebula). This nebula marks the interface between the HII region RCW 108 and the highly absorbing molecular material located westwards of the ionised region. The dominant CO structures, labeled E and F, have a radial velocity of about -23.5 and -21.8 km s<SUP>-1</SUP>, respectively. The former harbours a bright optical knot, the infrared cluster RCW-108 and the strong IRAS source 16362-4845. IRAS point sources are also seen in projection onto <SUP>12</SUP>CO concentrations F and H. This may indicate that the star forming process is a widespread phenomenon in this molecular complex. Extended continuum emission, having a high degree of spatial correlation with both the infrared and molecular emission, is observed in the region. We believe that this emission, thermal in nature, arises from the ionised surface layers of the molecular complex. The ionising agents are the high mass stars of NGC6193, the nucleus of Ara OB1. The total amount of molecular gas related to Ara OB1 is about ∼1.4×10<SUP>4</SUP> M⊙.Facultad de Ciencias Astronómicas y GeofísicasInstituto Argentino de Radioastronomía2003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf431-445http://sedici.unlp.edu.ar/handle/10915/84499enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20031455info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:15Zoai:sedici.unlp.edu.ar:10915/84499Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:16.048SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv A 12CO (J = 1 → 0) study towards the Ara OB1 region
title A 12CO (J = 1 → 0) study towards the Ara OB1 region
spellingShingle A 12CO (J = 1 → 0) study towards the Ara OB1 region
Arnal, Edmundo Marcelo
Ciencias Astronómicas
HII regions: individual: RCW 108
ISM: molecules
Open clusters and associations: individual: Ara OB1
Open clusters and associations: individual: NGC 6193
Radio continuum: ISM
Radio lines: ISM
title_short A 12CO (J = 1 → 0) study towards the Ara OB1 region
title_full A 12CO (J = 1 → 0) study towards the Ara OB1 region
title_fullStr A 12CO (J = 1 → 0) study towards the Ara OB1 region
title_full_unstemmed A 12CO (J = 1 → 0) study towards the Ara OB1 region
title_sort A 12CO (J = 1 → 0) study towards the Ara OB1 region
dc.creator.none.fl_str_mv Arnal, Edmundo Marcelo
May, J.
Romero, Gustavo Esteban
author Arnal, Edmundo Marcelo
author_facet Arnal, Edmundo Marcelo
May, J.
Romero, Gustavo Esteban
author_role author
author2 May, J.
Romero, Gustavo Esteban
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
HII regions: individual: RCW 108
ISM: molecules
Open clusters and associations: individual: Ara OB1
Open clusters and associations: individual: NGC 6193
Radio continuum: ISM
Radio lines: ISM
topic Ciencias Astronómicas
HII regions: individual: RCW 108
ISM: molecules
Open clusters and associations: individual: Ara OB1
Open clusters and associations: individual: NGC 6193
Radio continuum: ISM
Radio lines: ISM
dc.description.none.fl_txt_mv Intermediate angular resolution (HPBW = 8′.7) carbon monoxide (<SUP>12</SUP>CO J = 1 → 0) line observations towards the OB association Ara OB1 are reported. The molecular line observations cover an area of 2°.75 × 3°.00, and disclose a rich and complex distribution of the molecular line emission. The molecular features likely to be associated with the OB-association Ara OB1 span the velocity range from -28 to -20 km s<SUP>-1</SUP>. The most negative radial velocities are observed along NGC 6188 (≡Rim nebula). This nebula marks the interface between the HII region RCW 108 and the highly absorbing molecular material located westwards of the ionised region. The dominant CO structures, labeled E and F, have a radial velocity of about -23.5 and -21.8 km s<SUP>-1</SUP>, respectively. The former harbours a bright optical knot, the infrared cluster RCW-108 and the strong IRAS source 16362-4845. IRAS point sources are also seen in projection onto <SUP>12</SUP>CO concentrations F and H. This may indicate that the star forming process is a widespread phenomenon in this molecular complex. Extended continuum emission, having a high degree of spatial correlation with both the infrared and molecular emission, is observed in the region. We believe that this emission, thermal in nature, arises from the ionised surface layers of the molecular complex. The ionising agents are the high mass stars of NGC6193, the nucleus of Ara OB1. The total amount of molecular gas related to Ara OB1 is about ∼1.4×10<SUP>4</SUP> M⊙.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto Argentino de Radioastronomía
description Intermediate angular resolution (HPBW = 8′.7) carbon monoxide (<SUP>12</SUP>CO J = 1 → 0) line observations towards the OB association Ara OB1 are reported. The molecular line observations cover an area of 2°.75 × 3°.00, and disclose a rich and complex distribution of the molecular line emission. The molecular features likely to be associated with the OB-association Ara OB1 span the velocity range from -28 to -20 km s<SUP>-1</SUP>. The most negative radial velocities are observed along NGC 6188 (≡Rim nebula). This nebula marks the interface between the HII region RCW 108 and the highly absorbing molecular material located westwards of the ionised region. The dominant CO structures, labeled E and F, have a radial velocity of about -23.5 and -21.8 km s<SUP>-1</SUP>, respectively. The former harbours a bright optical knot, the infrared cluster RCW-108 and the strong IRAS source 16362-4845. IRAS point sources are also seen in projection onto <SUP>12</SUP>CO concentrations F and H. This may indicate that the star forming process is a widespread phenomenon in this molecular complex. Extended continuum emission, having a high degree of spatial correlation with both the infrared and molecular emission, is observed in the region. We believe that this emission, thermal in nature, arises from the ionised surface layers of the molecular complex. The ionising agents are the high mass stars of NGC6193, the nucleus of Ara OB1. The total amount of molecular gas related to Ara OB1 is about ∼1.4×10<SUP>4</SUP> M⊙.
publishDate 2003
dc.date.none.fl_str_mv 2003
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/84499
url http://sedici.unlp.edu.ar/handle/10915/84499
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20031455
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
431-445
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
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instname_str Universidad Nacional de La Plata
instacron_str UNLP
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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