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dc.contributor.author
Duronea, Nicolas Urbano
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Vasquez, Javier
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Gómez, L.
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Cappa, Cristina Elisabeth
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Firpo, Verónica
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López Caraballo, C. H.
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Rubio, Mónica
dc.date.available
2016-05-24T20:50:04Z
dc.date.issued
2015-07
dc.identifier.citation
Duronea, Nicolas Urbano; Vasquez, Javier; Gómez, L.; Cappa, Cristina Elisabeth; Firpo, Verónica; et al.; 870 micron continuum observations of the bubble-shaped nebula Gum 31; EDP Sciences; Astronomy and Astrophysics; 582; 7-2015; 2-16
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/5842
dc.description.abstract
Aims. We present here a study of the cold dust in the close environs of the ring nebula Gum 31. We aim at deriving the physical properties of the molecular gas and dust associated with the nebula, and investigating its correlation with the star formation in the region, which was probably triggered by the expansion of the ionization front against its environment.
Methods. We make use of 870 μm emission data obtained with the Large APEX Bolometer Camera (LABOCA) to map the dust emission. The 870 μm emission provides an excellent probe of mass and density of dense molecular clouds. The obtained LABOCA image was compared to archival infrared, radio continuum, and optical images.
Results. The 870 μm emission follows the 8 μm (Spitzer), 250 μm, and 500 μm (Herschel) emission distributions showing the classical morphology of a two-dimensional projection of a spherical shell. We use the 870 μm and 250 μm images to identify 60 dust clumps in the collected layers of molecular gas using the Gaussclumps algorithm. The clumps have effective deconvolved radii between 0.16 pc and 1.35 pc, masses between 70 M⊙ and 2800 M⊙, and volume densities between 1.1 × 103 cm-3 and ~2.04 × 105 cm-3. The total mass of the clumps is ~37 600 M⊙. The dust temperature of the clumps is in the range from 21 K to 32 K, while inside the Hii region it reaches ~40 K. The clump mass distribution for the sample is fitted by a power law dN/dlog (M/M⊙) ∝ M− α, with α = 0.93 ± 0.28. The slope differs from those obtained for the stellar IMF in the solar neighborhood, suggesting that the clumps are not direct progenitors of single stars/protostars. The mass-radius relationship for the 41 clumps detected in the 870 μm emission shows that only 37% of them lie in or above the high-mass star formation threshold. Most of this 37% have candidate YSOs projected inside their limits. A comparison of the dynamical age of the Hii region with the fragmentation time, allowed us to conclude that the collect-and-collapse mechanism may be important for the star formation at the edge of Gum 31, although other processes may be acting simultaneously. The position of the identified young stellar objects in the region is also a strong indicator that the collect-and-collapse process is acting.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
dc.rights
info:eu-repo/semantics/embargoedAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Interstellar Medium
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Hii Regions
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Stellar Formation
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Gum 31
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
870 micron continuum observations of the bubble-shaped nebula Gum 31
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2015-10-29T16:30:27Z
dc.journal.volume
582
dc.journal.pagination
2-16
dc.journal.pais
Francia
dc.journal.ciudad
Paris
dc.description.fil
Fil: Duronea, Nicolas Urbano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto Argentino de Radioastronomia (i); Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.description.fil
Fil: Vasquez, Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto Argentino de Radioastronomia (i); Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
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Fil: Gómez, L.. CSIRO Astronomy and Space Science; Australia. Universidad de Chile. Departamento de Astronomía; Chile
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Fil: Cappa, Cristina Elisabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto Argentino de Radioastronomia (i); Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
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Fil: Firpo, Verónica. Universidad de la Serena; Chile
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Fil: López Caraballo, C. H.. Universidad de la Serena; Chile
dc.description.fil
Fil: Rubio, Mónica. Universidad de Chile. Departamento de Astronomía; Chile
dc.journal.title
Astronomy and Astrophysics
dc.rights.embargoDate
2016-11-01
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2015/10/aa24724-14/aa24724-14.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201424724
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201424724
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