# The Collimated Jet Source in IRAS 16547-4247: Time Variation, Possible Precession, and Upper Limits to the Proper Motions along the Jet Axis

 Title: The Collimated Jet Source in IRAS 16547-4247: Time Variation, Possible Precession, and Upper Limits to the Proper Motions along the Jet Axis Author: Rodríguez, Luis F.; Moran, James M.; Franco-Hernández, Ramiro; Garay, Guido; Brooks, Kate J.; Mardones, Diego Note: Order does not necessarily reflect citation order of authors. Citation: Rodríguez, Luis F., James M. Moran, Ramiro Franco-Hernández, Guido Garay, Kate J. Brooks, and Diego Mardones. 2008. “The Collimated Jet Source in IRAS 16547-4247: Time Variation, Possible Precession, and Upper Limits to the Proper Motions along the Jet Axis.” Astronomical Journal 135 (6) (June 1): 2370-2379. doi:10.1088/0004-6256/135/6/2370. Full Text & Related Files: moran-collimated-jet.pdf (660.8Kb; PDF) Abstract: The triple radio source detected in association with the luminous infrared source IRAS 16547-4247 has previously been studied with high angular resolution and high sensitivity with the Very Large Array at 3.6 cm wavelength. In this paper, we present new 3.6 cm observations taken 2.68 years after the first epoch that allow a search for variability and proper motions, as well as the detection of additional faint sources in the region. We do not detect proper motions along the axis of the outflow in the outer lobes of this source at a 4σ upper limit of ~160 $$km s^{−1}$$. This suggests that these lobes are probably working surfaces where the jet is interacting with a denser medium. However, the brightest components of the lobes show evidence of precession, at a rate of $$0\mathring{.}08 yr^{−1}$$ clockwise in the plane of the sky. It may be possible to understand the distribution of almost all the identified sources as the result of ejecta from a precessing jet. The core of the thermal jet shows significant variations in flux density and morphology. We compare this source with other jets in low- and high-mass young stars and suggest that the latter can be understood as a scaled-up version of the former. Published Version: doi:10.1088/0004-6256/135/6/2370 Other Sources: http://arxiv.org/abs/0804.0858 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:11595849 Downloads of this work:

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