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Data On Astrophysics Discussed By T.A. Movsessian And Colleagues

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  • Data On Astrophysics Discussed By T.A. Movsessian And Colleagues

    DATA ON ASTROPHYSICS DISCUSSED BY T.A. MOVSESSIAN AND COLLEAGUES

    News of Science
    February 14, 2010

    "The kinematics of the HH 83 optical outflow, located in the L 1641
    molecular cloud, are investigated. Observations were carried out with
    the Fabry-Perot scanning interferometer on the 6-m telescope of the
    Special Astrophysical Observatory," scientists in Armenia report.

    "The H alpha emission line was scanned with a spectral resolution of
    R = 8200. The radial velocity along the jet increases with distance
    from the source, confirming previous results. It also shows lower
    amplitude variations which are not correlated with intensity. Both the
    spatial width of the jet as well as the FWHM of the H alpha emission
    line in the jet tend to decrease with distance from the source. The
    velocity field across the jet demonstrates a decrease from the center
    to the edges as well as some evidence for a transverse velocity
    gradient. The blue-shifted bow shock is separated spatially and
    spectrally into two distinct features, divided by about 2 " and 250
    km s(-1), accordingly. Evidence is provided that these split features
    correspond to forward and reverse shocks caused by a rapid pressure
    increase as the jet begins a new oblique impact on the surrounding
    medium. Radial velocity variations lengthwise and transverse to the
    jet axis are discussed. Linear extrapolation of the jet velocity up to
    the location of the terminal shock region yields the radial velocity
    of the reverse jet shock," wrote T.A. Movsessian and colleagues.

    The researchers concluded: "The data are consistent with an abrupt
    outburst about one thousand years ago which ejected material with
    total speeds of up to 400 km s(-1)."

    Movsessian and colleagues published their study in Astronomy &
    Astrophysics (Herbig-Haro flows in 3D: the HH 83 jet. Astronomy &
    Astrophysics, 2009;508(2):773-778).

    For additional information, contact T.A. Movsessian, Byurakan Astrophys
    Observ, Aragatsotn Reg 378433, Armenia.

    The publisher's contact information for the journal Astronomy
    & Astrophysics is: EDP Sciences S a, 17, Avenue du Hoggar, PA
    Courtaboeuf, BP 112, F-91944 les Ulis Cedex a, France.
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