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

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

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...748..103r&link_type=abstract

The Astrophysical Journal, Volume 748, Issue 2, article id. 103 (2012).

Astronomy and Astrophysics

Astronomy

Circumstellar Matter, Herbig-Haro Objects, Ism: Individual Objects: Hh 34, Ism: Jets And Outflows, Stars: Formation

Scientific paper

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.

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