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dc.contributor.author Arnal, Edmundo Marcelo
dc.contributor.author Duronea, Nicolas Urbano
dc.contributor.author Testori, Juan Carlos
dc.date.available 2017-08-17T21:25:15Z
dc.date.issued 2008-05
dc.identifier.citation Arnal, Edmundo Marcelo; Duronea, Nicolas Urbano; Testori, Juan Carlos; The molecular complex associated with RCW121 and RCW122; EDP Sciences; Astronomy and Astrophysics; 486; 3; 5-2008; 807-818
dc.identifier.issn 0004-6361
dc.identifier.uri http://hdl.handle.net/11336/22643
dc.description.abstract Aims. We analyse the distribution of the molecular gas towards the region containing the open cluster Havlen-Moffat 1 (HM 1) the Wolf-Rayet stars WR 87, WR 89, and WR 91, and the star forming regions RCW 121 and RCW 122, with the aim of looking for a possible physical relationship among these objects. Methods. We used the carbon monoxide observations carried out at λ ∼ 2.6 mm with the 4 m NANTEN radiotelescope; new flux density determinations derived from already existing radio continuum surveys at 2.417, 5, 8.35, and 14.35 GHz; continuum flux density determinations available in the literature; and the Midcourse Space Experiment (MSX) and the Improved Reprocessing of the IRAS Survey (IRIS) databases. Results. Adopting a distance of 5 kpc for RCW 121 and RCW 122, we found a giant molecular cloud (GMC) with a linear extent of ∼100 × 20 pc to be associated with galactic star-forming regions. The total mass of this GMC is of the order of 1.2 × 106 solar masses and its mean radial velocity is about –15 km s−1. Within the GMC there are individual molecular gas concentrations, having total molecular masses in the range from 4.6 × 104 M (RCW 122 C) to 2.2 × 105 M (RCW 122). The CO profiles observed toward the peak of the molecular concentrations are broad, with typical full-width half-maximum around 6 to 7 km s−1, and show line asymmetries and/or double-peaked shape that change with the observed position within a given CO concentration. An analysis of the MSX and IRAS databases show that each CO concentration has a strong IR counterpart. The dust temperature of these concentrations range from 46 K (RCW 121) to 76 K (RCW 122 C). Their infrared luminosity are a few times 105 L . The new radio continuum flux density determinations are in good agreement with previous determinations at other frequencies, and confirm the thermal nature of RCW 121 and RCW 122. Based on the newly-determined 5 GHz flux density, we found that to power these Hii regions, each of them must harbour a sizable number of O type stars. Under the assumption that all the ionizing stars have a O7 V spectral type, at least ∼8 and ∼4 of these stars would be needed to ionize RCW 122 and RCW 121, respectively.
dc.format application/pdf
dc.language.iso eng
dc.publisher EDP Sciences
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject Molecules
dc.subject Radio continuum
dc.subject Infrared
dc.subject HII regions
dc.subject RCW 121 (estrella)
dc.subject RCW 122 (estrella)
dc.subject Interstellar medium
dc.subject Wolf Rayet stars
dc.subject.classification Otras Ciencias Físicas
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title The molecular complex associated with RCW121 and RCW122
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2017-05-18T21:20:41Z
dc.journal.volume 486
dc.journal.number 3
dc.journal.pagination 807-818
dc.journal.pais Francia
dc.journal.ciudad Paris
dc.description.fil Fil: Arnal, Edmundo Marcelo. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; Argentina
dc.description.fil Fil: Duronea, Nicolas Urbano. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; Argentina
dc.description.fil Fil: Testori, Juan Carlos. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; Argentina
dc.journal.title Astronomy and Astrophysics
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2009RMxAC..35...48A
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2008/30/aa9126-07/aa9126-07.html
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1051/0004-6361:20079126


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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)