The bow shock and Mach disk of HH 34

Details The bow shock and Mach disk of HH 34 The bow shock and Mach disk of HH 34

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..231m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 1, p. 231-245.

Astronomy and Astrophysics

Astrophysics

93

Bow Waves, Herbig-Haro Objects, Shock Wave Propagation, Astronomical Models, Electron Density (Concentration), Emission Spectra, Fabry-Perot Interferometers, Forbidden Bands, Interstellar Extinction, Interstellar Magnetic Fields

Scientific paper

The Rutgers/CTIO imaging Fabry-Perot interferometer was used to acquire spatially resolved line profiles across the bow shock and Mach disk of the Herbig-Haro object HH 34 forbidden 5007 A, H-alpha, and forbidden S II 6716, 6713 AA. The Mach disk emission in this outflow was separated from the bow shock emission both spatially and kinematically. The observations provide detailed kinematic information about the shocked material behind the Mach disk of a stellar object. Strong evidence is found to the effect that the medium in front of the bow shock moves at a velocity of about 150 km/s away from the source, possibly due to previous eruptions of the outflow, and that there is separate emission from the bow shock and Mach disk in HH 34. Given the bow shock velocity, preshock density, and postshock electron densities measured at different points along the bow shock, a magnetic field of 10-20 micro-G in the preshock gas of HH 34m, i.e., in the wake of the earlier ejection, is estimated.

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