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Ortega, M.E.; Paron, S.; Cichowolski, S.; Rubio, M.; Dubner, G. "Outflow activity in the UCHII region G045.47+0.05" (2012) Astronomy and Astrophysics. 546
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Abstract:

Aims. This work aims at investigating the molecular gas in the surroundings of the ultra-compact HII region G045.47+0.05 looking for evidence of molecular outflows. Methods. We carried out observations towards a region of 2′ × 2′ centered at RA = 19h14m25.6s, Dec = +11°09′27.6′′(J2000) using the Atacama Submillimeter Telescope Experiment (ASTE; Chile) in the 12CO J = 3-2, 13CO J = 3-2, HCO+J = 4-3, and CS J = 7-6 lines with an angular resolution of 22′′. We complement these observations with public infrared data. Results. We characterize the physical parameters of the molecular clump where G045.47+0.0 is embedded. The detection of the CS J = 7-6 line emission in the region reveals that the ultra-compact HII region G045.47+0.0 has not completely disrupted the dense gas where it was born. The HCO+ abundance observed towards G045.47+0.0 suggests there is molecular outflow activity in the region. From the analysis of the 12CO J = 3-2 transition we report bipolar molecular outflows with a total mass of about 300 M·. We derive a dynamical time (flow's age) of about 105 yr for the outflow gas, in agreement with the presence of an ultra-compact HII region. We identify the source 2MASS 19142564+1109283 as the massive protostar candidate to drive the molecular outflows. Based on the analysis of its spectral energy distribution, we infer that it is an early B-type star of about 15 M·. The results of this work support the scenario where the formation of massive stars, at least up to early B-type stars, is similar to that of low-mass stars. © 2012 ESO.

Registro:

Documento: Artículo
Título:Outflow activity in the UCHII region G045.47+0.05
Autor:Ortega, M.E.; Paron, S.; Cichowolski, S.; Rubio, M.; Dubner, G.
Filiación:Instituto de Astronomía y Física Del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina
FADU-Universidad de Buenos Aires, Argentina
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
Palabras clave:ISM: jets and outflows; ISM: molecules; Stars: formation; Digital storage; Giant stars; Molecular mass; Angular resolution; ISM: jets and out flow; ISM: molecules; Molecular clumps; Molecular outflows; Physical parameters; Spectral energy distribution; Stars: formation; Fighter aircraft
Año:2012
Volumen:546
DOI: http://dx.doi.org/10.1051/0004-6361/201219424
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v546_n_p_Ortega

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Citas:

---------- APA ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M. & Dubner, G. (2012) . Outflow activity in the UCHII region G045.47+0.05. Astronomy and Astrophysics, 546.
http://dx.doi.org/10.1051/0004-6361/201219424
---------- CHICAGO ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Dubner, G. "Outflow activity in the UCHII region G045.47+0.05" . Astronomy and Astrophysics 546 (2012).
http://dx.doi.org/10.1051/0004-6361/201219424
---------- MLA ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Dubner, G. "Outflow activity in the UCHII region G045.47+0.05" . Astronomy and Astrophysics, vol. 546, 2012.
http://dx.doi.org/10.1051/0004-6361/201219424
---------- VANCOUVER ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Dubner, G. Outflow activity in the UCHII region G045.47+0.05. Astron. Astrophys. 2012;546.
http://dx.doi.org/10.1051/0004-6361/201219424