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Abstract:

Aims. The red MSX source G034.5964-01.0292 (MSXG34), catalogued as a massive young stellar object, was observed in molecular lines with the aim of discovering and studying molecular outflows. Methods. We mapped a region of 3′× 3′ centred at MSXG34 using the Atacama Submillimeter Telescope Experiment in the 12CO J = 3-2 and HCO+J = 4-3 lines with an angular and spectral resolution of 22′′ and 0.11 km s-1 s-1. Additionally, public 13CO J = 1-0 and near-IR UKIDSS data obtained from the Galactic Ring Survey and the WFCAM Sciencie Archive were analysed. Results. We found that the 12CO spectra towards the YSO present a self-absorption dip, as is common in star-forming regions, and spectral wings that indicate outflow activity. The HCO+ was detected only towards the MSXG34 position at vLSR ~ 14.2 km s-1 s-1, in coincidence with the 12CO absorption dip and approximately with the velocity of previous ammonia observations. HCO+ and NH3 are known to be enhanced in molecular outflows. When we analysed the spectral wings of the 12CO line, we discovered misaligned red-and blue-shifted molecular outflows associated with MSXG34. The near-IR emission shows a cone-like nebulosity composed of two arc-like features related to the YSO, which might be due to a cavity cleared in the circumstellar material by a precessing jet. This can explain the misalignment in the molecular outflows. From the analysis of the 13CO J = 1-0 data we suggest that the YSO is very likely related to a molecular clump ranging between 10 and 14 km s-1 s-1. This suggests that MSXG34, with an associated central velocity of about 14 km s-1 s-1, may be located in the background of this clump. Thus, the blue-shifted outflow is probably deflected by the interaction with dense gas along the line of sight. From a spectral energy distribution analysis of MSXG34 we found that its central object probably is an intermediate-mass protostar. © 2014 ESO.

Registro:

Documento: Artículo
Título:Discovering a misaligned CO outflow related to the red MSX source G034.5964-01.0292
Autor:Paron, S.; Ortega, M.E.; Petriella, A.; Rubio, M.
Filiación:Instituto de Astronomía y Física Del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina
FADU, CBC-Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Astronomía, Universidad de Chile, Casilla 36-D Santiago, Chile
Palabras clave:ISM: jets and outflows; ISM: molecules; Stars: formation; Molecular mass; Circumstellar materials; ISM: jets and out flow; ISM: molecules; Molecular outflows; Spectral energy distribution; Star-forming region; Stars: formation; Young stellar objects; Stars
Año:2014
Volumen:567
DOI: http://dx.doi.org/10.1051/0004-6361/201423693
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_v567_n_p_Paron

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Citas:

---------- APA ----------
Paron, S., Ortega, M.E., Petriella, A. & Rubio, M. (2014) . Discovering a misaligned CO outflow related to the red MSX source G034.5964-01.0292. Astronomy and Astrophysics, 567.
http://dx.doi.org/10.1051/0004-6361/201423693
---------- CHICAGO ----------
Paron, S., Ortega, M.E., Petriella, A., Rubio, M. "Discovering a misaligned CO outflow related to the red MSX source G034.5964-01.0292" . Astronomy and Astrophysics 567 (2014).
http://dx.doi.org/10.1051/0004-6361/201423693
---------- MLA ----------
Paron, S., Ortega, M.E., Petriella, A., Rubio, M. "Discovering a misaligned CO outflow related to the red MSX source G034.5964-01.0292" . Astronomy and Astrophysics, vol. 567, 2014.
http://dx.doi.org/10.1051/0004-6361/201423693
---------- VANCOUVER ----------
Paron, S., Ortega, M.E., Petriella, A., Rubio, M. Discovering a misaligned CO outflow related to the red MSX source G034.5964-01.0292. Astron. Astrophys. 2014;567.
http://dx.doi.org/10.1051/0004-6361/201423693