Abstract:
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.
Registro:
| Documento: |
Artículo
|
| Título: | Unveiling the circumstellar environment toward a massive young stellar object |
| Autor: | Paron, S.; Fariña, C.; Ortega, M.E. |
| Filiación: | Instituto de Astronomía y Física Del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina
FADU and CBC, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Isaac Newton Group of Telescopes, 38700 La palma, Spain
|
| Palabras clave: | 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 |
| Año: | 2013
|
| Volumen: | 559
|
| DOI: |
http://dx.doi.org/10.1051/0004-6361/201322521 |
| 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_v559_n_p_Paron |
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Citas:
---------- APA ----------
Paron, S., Fariña, C. & Ortega, M.E.
(2013)
. Unveiling the circumstellar environment toward a massive young stellar object. Astronomy and Astrophysics, 559.
http://dx.doi.org/10.1051/0004-6361/201322521---------- CHICAGO ----------
Paron, S., Fariña, C., Ortega, M.E.
"Unveiling the circumstellar environment toward a massive young stellar object"
. Astronomy and Astrophysics 559
(2013).
http://dx.doi.org/10.1051/0004-6361/201322521---------- MLA ----------
Paron, S., Fariña, C., Ortega, M.E.
"Unveiling the circumstellar environment toward a massive young stellar object"
. Astronomy and Astrophysics, vol. 559, 2013.
http://dx.doi.org/10.1051/0004-6361/201322521---------- VANCOUVER ----------
Paron, S., Fariña, C., Ortega, M.E. Unveiling the circumstellar environment toward a massive young stellar object. Astron. Astrophys. 2013;559.
http://dx.doi.org/10.1051/0004-6361/201322521
