Internal Velocities in the Orion Nebula: Large Proper-Motion Features

Details Internal Velocities in the Orion Nebula: Large Proper-Motion Features Internal Velocities in the Orion Nebula: Large Proper-Motion Features

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124..445d&link_type=abstract

The Astronomical Journal, Volume 124, Issue 1, pp. 445-463.

Astronomy and Astrophysics

Astronomy

40

Herbig-Haro Objects, Ism: Individual: Name: Orion Nebula, Ism: Jets And Outflows, Stars: Winds, Outflows

Scientific paper

The proper motions of Herbig-Haro (HH) objects in the Orion Nebula were measured with a +/-10 km s-1 accuracy using the Hubble Space Telescope Wide Field Planetary Camera 2 images in [S II], [N II], Hα, and [O III], taken 4-6 yr apart. Seven HH flows in the outer region as well as seven HH objects in the inner region of the BN-KL complex were identified. The H2 finger system was confirmed to be created by an explosive event that took place approximately 1000 yr ago. We found a new HH flow toward the northwest originating from the vicinity of OMC-1S, which may be a part of the low-velocity bipolar flows centered at FIR 4. The proper motion of HH 202 was also measured with high accuracy for the first time. The proper-motion vectors of HH 202 and HH 203/204 are aligned well with their projected symmetric axis, which may indicate that they emanated from the same source. The proper-motion measurements in various emission lines provide generally the same results in the wide range of velocity from 20 to 400 km s-1, as expected for shocks in a steady state. Based in part on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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