The molecular environment of the pillar like features in the H II region G46.5–0.2
Author
dc.contributor.author
Paron, S.
Author
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Celis Peña, M.
Author
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Ortega, M. E.
Author
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Fariña, C.
Author
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Petriella, A.
Author
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Rubio López, Mónica
Author
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Ashley, R. P.
Admission date
dc.date.accessioned
2018-07-10T21:03:57Z
Available date
dc.date.available
2018-07-10T21:03:57Z
Publication date
dc.date.issued
2017
Cita de ítem
dc.identifier.citation
Monthly Notices of The Royal Astronomical Society, 470, 4662–4670 (2017)
es_ES
Identifier
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10.1093/mnras/stx1486
Identifier
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https://repositorio.uchile.cl/handle/2250/149720
Abstract
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At the interface of H II regions and molecular gas, peculiar structures appear, some of them with pillar-like shapes. Understanding their origin is important for characterizing triggered star formation and the impact of massive stars on the interstellar medium. In order to study the molecular environment and influence of radiation on two pillar-like features related to the H II region G46.5-0.2, we performed molecular line observations with the Atacama Submillimeter Telescope Experiment and spectroscopic optical observations with the Isaac Newton Telescope. From the optical observations, we identified the star that is exciting the H II region as spectral type O4-6. The molecular data allowed us to study the structure of the pillars and an HCO+ cloud lying between them. In this HCO+ cloud, which has no well-defined (CO)-C-12 counterpart, we found direct evidence of star formation: two molecular outflows and two associated near-IR nebulosities. The outflow axis orientation is perpendicular to the direction of the radiation flow from the H II region. Several Class I sources are also embedded in this HCO+ cloud, showing that it is usual that young stellar objects (YSOs) form large associations occupying a cavity bounded by pillars. On the other hand, it was confirmed that the radiation-driven implosion (RDI) process is not occurring in one of the pillar tips.
es_ES
Patrocinador
dc.description.sponsorship
CONICET
ANPCYT
UBA (UBACyT) from Argentina
Varsavsky Foundation
FONDECYT(CHILE)
1140839