Outflow activity in the UCHII region G045.47+0.05
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 Ata...
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2012
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v546_n_p_Ortega http://hdl.handle.net/20.500.12110/paper_00046361_v546_n_p_Ortega |
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paper:paper_00046361_v546_n_p_Ortega |
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paper:paper_00046361_v546_n_p_Ortega2023-06-08T14:28:01Z Outflow activity in the UCHII region G045.47+0.05 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 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v546_n_p_Ortega http://hdl.handle.net/20.500.12110/paper_00046361_v546_n_p_Ortega |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Outflow activity in the UCHII region G045.47+0.05 |
| topic_facet |
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 |
| description |
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. |
| title |
Outflow activity in the UCHII region G045.47+0.05 |
| title_short |
Outflow activity in the UCHII region G045.47+0.05 |
| title_full |
Outflow activity in the UCHII region G045.47+0.05 |
| title_fullStr |
Outflow activity in the UCHII region G045.47+0.05 |
| title_full_unstemmed |
Outflow activity in the UCHII region G045.47+0.05 |
| title_sort |
outflow activity in the uchii region g045.47+0.05 |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v546_n_p_Ortega http://hdl.handle.net/20.500.12110/paper_00046361_v546_n_p_Ortega |
| _version_ |
1768545581725122560 |