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Published April 1, 2012 | Published
Journal Article Open

The Kinematics of HH 34 from HST Images with a Nine-year Time Baseline


We study archival HST [S II] 6716+30 and Hα images of the HH 34 outflow, taken in 1998.71 and in 2007.83. The ~9 yr time baseline and the high angular resolution of these observations allow us to carry out a detailed proper-motion study. We determine the proper motions of the substructure of the HH 34S bow shock (from the [S II] and Hα frames) and of the aligned knots within ~30'' from the outflow source (only from the [S II] frames). We find that the present-day motions of the knots along the HH 34 jet are approximately ballistic, and that these motions directly imply the formation of a major mass concentration in ~900 yr, at a position similar to the one of the present-day HH 34S bow shock. In other words, we find that the knots along the HH 34 jet will merge to form a more massive structure, possibly resembling HH 34S.

Additional Information

© 2012 American Astronomical Society. Received 2011 September 8; accepted 2012 January 19; published 2012 March 13. This paper is based on observations made with the NASA/ESA Hubble Space Telescope, and information obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (ST-ECF/ESA), and the Canadian Astronomy Data Centre (CADC/NRC/CSA). The work of A.R., A.R.G., and V.L. was supported by the CONACyT grants 61547, 101356, and 101975. We thank John Bally (the referee) for helpful comments which led to the inclusion of Figure 6 and to the discussion at the end of Section 5.

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Published - Raga2012p18026Astrophys_J.pdf


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