Unveiling the circumstellar environment toward a massive young stellar object
Aims. As a continuation of a previous work, in which we found strong evidence of massive molecular outflows toward a massive starforming site, we present a new study of this region based on very high angular resolution observations with the aim of discovering the outflow-driven mechanism. Methods. U...
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todo:paper_00046361_v559_n_p_Paron2023-10-03T14:00:48Z Unveiling the circumstellar environment toward a massive young stellar object Paron, S. Fariña, C. Ortega, M.E. HII regions ISM: jets and outflows Stars: formation Angular resolution Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Stars: formation Very high angular resolution Young stellar objects Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Spatial resolution Stars: formation Very high angular resolution Young stellar objects Morphology Fighter aircraft Stars Stars Aims. As a continuation of a previous work, in which we found strong evidence of massive molecular outflows toward a massive starforming site, we present a new study of this region based on very high angular resolution observations with the aim of discovering the outflow-driven mechanism. Methods. Using near-IR data acquired with Gemini-NIRI at the broad H- and Ks-bands, we studied a region of 22 22 around the UCHii region G045.47+0.05, a massive-star forming site at a distance of about 8 kpc. To image the source with the highest spatial resolution possible we employed the adaptative optics system ALTAIR, achieving an angular resolution of about 0. 15. Results. We discovered a cone shaped nebula that has an opening angle of about 90? and extends eastward of the IR source 2MASS J19142564+1109283, which is very likely a massive young stellar object (MYSO). This morphology suggests a cavity that was cleared in the circumstellar material, and its emission may arise from scattered continuum light, warm dust, and probably also from emission lines from shock-excited gas. The nebula, which presents arc-like features, is connected with the IR source through a jet-like structure, which is aligned with the blueshifted CO outflow found in a previous study. The near-IR structure lies ?3 north of the radio continuum emission, revealing that it is not spatially coincident with the UCHii region. The observed morphology and structure of the near-IR nebula strongly suggest the presence of a precessing jet. We resolved the circumstellar environment (in scale of a thousand AU) of a distant MYSO, indeed one of the farthest currently known. © ESO 2013. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v559_n_p_Paron |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
HII regions ISM: jets and outflows Stars: formation Angular resolution Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Stars: formation Very high angular resolution Young stellar objects Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Spatial resolution Stars: formation Very high angular resolution Young stellar objects Morphology Fighter aircraft Stars Stars |
| spellingShingle |
HII regions ISM: jets and outflows Stars: formation Angular resolution Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Stars: formation Very high angular resolution Young stellar objects Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Spatial resolution Stars: formation Very high angular resolution Young stellar objects Morphology Fighter aircraft Stars Stars Paron, S. Fariña, C. Ortega, M.E. Unveiling the circumstellar environment toward a massive young stellar object |
| topic_facet |
HII regions ISM: jets and outflows Stars: formation Angular resolution Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Stars: formation Very high angular resolution Young stellar objects Circumstellar materials H II regions ISM: jets and out flow Morphology and structures Spatial resolution Stars: formation Very high angular resolution Young stellar objects Morphology Fighter aircraft Stars Stars |
| description |
Aims. As a continuation of a previous work, in which we found strong evidence of massive molecular outflows toward a massive starforming site, we present a new study of this region based on very high angular resolution observations with the aim of discovering the outflow-driven mechanism. Methods. Using near-IR data acquired with Gemini-NIRI at the broad H- and Ks-bands, we studied a region of 22 22 around the UCHii region G045.47+0.05, a massive-star forming site at a distance of about 8 kpc. To image the source with the highest spatial resolution possible we employed the adaptative optics system ALTAIR, achieving an angular resolution of about 0. 15. Results. We discovered a cone shaped nebula that has an opening angle of about 90? and extends eastward of the IR source 2MASS J19142564+1109283, which is very likely a massive young stellar object (MYSO). This morphology suggests a cavity that was cleared in the circumstellar material, and its emission may arise from scattered continuum light, warm dust, and probably also from emission lines from shock-excited gas. The nebula, which presents arc-like features, is connected with the IR source through a jet-like structure, which is aligned with the blueshifted CO outflow found in a previous study. The near-IR structure lies ?3 north of the radio continuum emission, revealing that it is not spatially coincident with the UCHii region. The observed morphology and structure of the near-IR nebula strongly suggest the presence of a precessing jet. We resolved the circumstellar environment (in scale of a thousand AU) of a distant MYSO, indeed one of the farthest currently known. © ESO 2013. |
| format |
JOUR |
| author |
Paron, S. Fariña, C. Ortega, M.E. |
| author_facet |
Paron, S. Fariña, C. Ortega, M.E. |
| author_sort |
Paron, S. |
| title |
Unveiling the circumstellar environment toward a massive young stellar object |
| title_short |
Unveiling the circumstellar environment toward a massive young stellar object |
| title_full |
Unveiling the circumstellar environment toward a massive young stellar object |
| title_fullStr |
Unveiling the circumstellar environment toward a massive young stellar object |
| title_full_unstemmed |
Unveiling the circumstellar environment toward a massive young stellar object |
| title_sort |
unveiling the circumstellar environment toward a massive young stellar object |
| url |
http://hdl.handle.net/20.500.12110/paper_00046361_v559_n_p_Paron |
| work_keys_str_mv |
AT parons unveilingthecircumstellarenvironmenttowardamassiveyoungstellarobject AT farinac unveilingthecircumstellarenvironmenttowardamassiveyoungstellarobject AT ortegame unveilingthecircumstellarenvironmenttowardamassiveyoungstellarobject |
| _version_ |
1807321968434741248 |