Kinematics of the HH 43 Flow: Evidence for a Precessing Jet?

Details Kinematics of the HH 43 Flow: Evidence for a Precessing Jet? Kinematics of the HH 43 Flow: Evidence for a Precessing Jet?

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....117..456s&link_type=abstract

The Astronomical Journal, Volume 117, Issue 1, pp. 456-461.

Astronomy and Astrophysics

Astronomy

15

Ism: Jets And Outflows, Ism: Kinematics And Dynamics

Scientific paper

High spectral resolution long-slit spectra of HH 43 obtained in the 1-0 S(1) line of H_2 are reported. A direct image of HH 43 obtained in the 1-0 S(1) line of H_2 reveals a close correspondence with knots as seen in optical [S II] and Hα emission. We suggest that ambient molecular gas is being entrained and shocked by an atomic flow. The position-velocity diagram along the central axis of HH 43 as seen in H_2 reveals a sinusoidal-like structure with a semiamplitude of 8 km s^-1 and a spatial wavelength of about 8000 AU. A direct Hα image of HH 43 shows evidence for a morphological wiggle with a semiamplitude of about 2" that has the same spatial wavelength and phase seen in the 8 km s^-1 kinematic oscillation. These data suggest that HH 43 may be produced by a precessing jet in a close pre-main-sequence binary system. Possible system parameters are explored.

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