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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Detalles Bibliográficos
Autores principales:	Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Dubner, G.
Formato:	JOUR
Materias:	ISM: jets and outflows ISM: molecules Stars: formation Digital storage Giant stars Molecular mass Angular resolution ISM: jets and out flow Molecular clumps Molecular outflows Physical parameters Spectral energy distribution Fighter aircraft
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00046361_v546_n_p_Ortega
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00046361_v546_n_p_Ortega
record_format	dspace
spelling	todo:paper_00046361_v546_n_p_Ortega2023-10-03T14:00:43Z Outflow activity in the UCHII region G045.47+0.05 Ortega, M.E. Paron, S. Cichowolski, S. Rubio, M. Dubner, G. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Ortega, M.E. Paron, S. Cichowolski, S. Rubio, M. Dubner, G. 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.
format	JOUR
author	Ortega, M.E. Paron, S. Cichowolski, S. Rubio, M. Dubner, G.
author_facet	Ortega, M.E. Paron, S. Cichowolski, S. Rubio, M. Dubner, G.
author_sort	Ortega, M.E.
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
url	http://hdl.handle.net/20.500.12110/paper_00046361_v546_n_p_Ortega
work_keys_str_mv	AT ortegame outflowactivityintheuchiiregiong04547005 AT parons outflowactivityintheuchiiregiong04547005 AT cichowolskis outflowactivityintheuchiiregiong04547005 AT rubiom outflowactivityintheuchiiregiong04547005 AT dubnerg outflowactivityintheuchiiregiong04547005
_version_	1807321905801199616

Outflow activity in the UCHII region G045.47+0.05

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