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- W2032657712 abstract "We derive the physical properties at the base of the jet from DG Tau both along and across the flow and as a function of velocity. We analysed seven optical spectra of the DG Tau jet, taken with the Hubble Space Telescope Imaging Spectrograph. The spectra were obtained by placing a long-slit parallel to the jet axis and stepping it across the jet width. The resulting position-velocity diagrams in optical forbidden emission lines allowed access to plasma conditions via calculation of emission line ratios. We find at the base of the jet high electron density, $n_e sim $ 10$^5$, and very low ionisation, $x_e sim 0.02-0.05$, which combine to give a total density up to $n_H sim $ 3 10$^6$. This analysis confirms previous reports of variations in plasma parameters along the jet, (i.e. decrease in density by several orders of magnitude, increase of $x_e$ from 0.05 to a plateau at 0.7 downstream at 2$''$ from the star). Furthermore, a spatial coincidence is revealed between sharp gradients in the total density and supersonic velocity jumps. This strongly suggests that the emission is caused by shock excitation. The position-velocity diagrams indicate the presence of both fast accelerating gas and slower, less collimated material. We derive the mass outflow rate, $dot{M}_j$, in the blue-shifted lobe in different velocity channels, that contribute to a total of $dot{M}_j sim$ 8 $pm$ 4 10$^{-9}$ M$_odot$ yr$^{-1}$. We estimate that a symmetric bipolar jet would transport at the low and intermediate velocities probed by rotation measurements, an angular momentum flux of $dot{L}_j sim$ 2.9 $pm$ 1.5 10$^{-6}$ M$_odot$ yr$^{-1}$ AU km s$^{-1}$. The derived properties of the DG Tau jet are demonstrated to be consistent with magneto-centrifugal theory. However, non-stationary modelling is required in order to explain all of the features revealed at high resolution." @default.
- W2032657712 created "2016-06-24" @default.
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- W2032657712 date "2014-05-01" @default.
- W2032657712 modified "2023-09-27" @default.
- W2032657712 title "Physical properties of the jet from DG Tauri on sub-arcsecond scales with HST/STIS" @default.
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- W2032657712 doi "https://doi.org/10.1051/0004-6361/201117510" @default.
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