INVESTIGADORES
PARON Sergio Ariel
artículos
Título:
Discovering a misaligned CO outflow related to the red MSX source G034.5964-01.0292
Autor/es:
S. PARON, M. E. ORTEGA, A. PETRIELLA; M. RUBIO
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2014
ISSN:
0004-6361
Resumen:
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. 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, 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. This suggests that MSXG34, with an associated central
velocity of about 14 km 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.