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dc.contributor.author
Ortega, Martin Eduardo
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dc.contributor.author
Paron, Sergio Ariel
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dc.contributor.author
Areal, María Belén
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dc.contributor.author
Rubio, M.
dc.date.available
2022-12-22T14:39:19Z
dc.date.issued
2020-01
dc.identifier.citation
Ortega, Martin Eduardo; Paron, Sergio Ariel; Areal, María Belén; Rubio, M.; Kinematic study of the molecular gas associated with two cometary globules in Sh2-236; EDP Sciences; Astronomy and Astrophysics; 633; 1-2020; 1-8
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/182178
dc.description.abstract
Aims. Cometary globules, dense molecular gas structures exposed to UV radiation, are found inside H » II regions. Understanding the nature and origin of these structures through a kinematic study of the molecular gas could be useful to advance in our knowledge of the interplay between radiation and molecular gas. Methods. Using the Atacama Submillimeter Telescope Experiment (Chile), we carried out molecular observations toward two cometary globules (Sim129 and Sim130) in the H » II region Sh2-236. We mapped two regions of about 1′ × 1′ with the 12CO J = 3-2 and HCO+ J = 4-3 lines. Additionally, we carried out two single pointings with the C2H N = 4-3, HNC, and HCN J = 4-3 transitions. The angular resolution was about 22′′. We combined our molecular observations with public infrared and optical data to analyze the distribution and kinematics of the molecular gas. Results. We find kinematic signatures of infalling gas in the 12CO J = 3-2 and C2H N = 4-3 spectra toward Sim 129. We detect HCO+, HCN, and HNC J = 4-3 only toward Sim 130. The HCN/HNC integrated ratio of about three found in Sim 130 suggests that the possible star-formation activity inside this globule has not yet ionized the gas. The location of the NVSS source 052255+33315, which peaks toward the brightest border of the globule, supports this scenario. The non-detection of these molecules toward Sim 129 could be due to the radiation field arising from the star-formation activity inside this globule. The ubiquitous presence of the C2H molecule toward Sim 129 and Sim 130 evidences the action of the nearby O-B stars irradiating the external layer of both globules. Based on the mid-infrared 5.8 μm emission, we identify two new structures: (1) a region of diffuse emission (R1) located, in projection, in front of the head of Sim 129 and (2) a pillar-like feature (P1) placed besides Sim 130. Based on the 12CO J = 3-2 transition, we find molecular gas associated with Sim 129, Sim 130, R1, and P1 at radial velocities of -1.5, -11, +10, and +4 km s-1, respectively. Therefore, while Sim 129 and P1 are located at the far side of the shell, Sim 130 is placed at the near side, consistent with earlier results. Finally, the molecular gas related to R1 exhibits a radial velocity that differs in more than 11 km s-1 with the radial velocity of S129, which suggests that while S129 is located at the far side of the expanding shell, R1 would be placed well beyond.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
HII REGIONS
dc.subject
ISM: MOLECULES
dc.subject
STARS: FORMATION
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Kinematic study of the molecular gas associated with two cometary globules in Sh2-236
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-08-20T19:38:57Z
dc.journal.volume
633
dc.journal.pagination
1-8
dc.journal.pais
Francia
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dc.journal.ciudad
París
dc.description.fil
Fil: Ortega, Martin Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: Paron, Sergio Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Universidad de Buenos Aires. Facultad de Arquitectura, Diseño y Urbanismo; Argentina
dc.description.fil
Fil: Areal, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: Rubio, M.. Universidad de Chile; Chile
dc.journal.title
Astronomy and Astrophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2020/01/aa35021-19/aa35021-19.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201935021
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