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Evidence for past knot mergers in the HH34 jet

Raga, A. C. and Noriego-Crespo, A. (2013) Evidence for past knot mergers in the HH34 jet. Revista Mexicana de Astronomía y Astrofísica, 49 (2). pp. 363-369. ISSN 0185-1101.

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Within ≈3000 from the outflow source, the HH34 jet has a chain of well aligned knots. The positions and proper motions of these knots can be used to determine dynamical timescales, and estimates of the ejection period (by taking differences between the dynamical timescales of the successive knots). Through this exercise, we find that larger estimated ejection periods are found for the knots further away from the outflow source (i.e., for the knots with larger dynamical timescales). We interpret this result in terms of a model in which the knots have a low amplitude (≈15–20%) random ejection velocity variability and a well defined period of ≈16 yr, leading to a few knot-merging events.

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Additional Information:© 2013 Universidad Nacional Autónoma de México. Received 2013 May 30; accepted 2013 August 15. We acknowledge support from the Conacyt grants 61547, 101356, 101975, 165584, 167611 and 167625, and from the DGAPA-Universidad Nacional Autónoma de México grants IN105312 and IN106212. We thank an anonymous referee for helpful comments which resulted in the discussion at the end of § 2.2.
Funding AgencyGrant Number
CONACyT (Mexico)61547
CONACyT (Mexico)101356
CONACyT (Mexico)101975
CONACyT (Mexico)165584
CONACyT (Mexico)167611
DGAPA-Universidad Nacional Autónoma de MéxicoIN105312
DGAPA-Universidad Nacional Autónoma de MéxicoIN106212
Subject Keywords:Herbig-Haro objects; ISM: kinematics and dynamics; stars: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20131113-094907332
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42418
Deposited On:13 Nov 2013 23:42
Last Modified:03 Oct 2019 05:58

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