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• W2126849377 abstract "We present results of the velocity-resolved spectroscopy of the [Fe II] λ1.644 μm emission line along the optical jet emanating from DG Tau. The slit spectrum, obtained with the Subaru Telescope adaptive optics system at an angular resolution of 016, shows strong, entirely blueshifted emission on the southwest side of the star. A faint, redshifted counterfeature was also detected on the northeast side with emission within 07 of the star being occulted by the circumstellar disk. The blueshifted emission has two distinct radial velocity components. The low-velocity component (LVC) has a peak radial velocity of ~-100 km s-1 with a FWHM line width of ~100 km s-1, and it peaks at 02-05 from the star. The high-velocity component (HVC) peaks at 06-08 away from the star, showing a peak radial velocity of ~-220 km s-1 with a line width of ~50 km s-1. These characteristics are remarkably similar to the [Fe II] outflow from L1551 IRS 5, although the linear scales of the HVCs and LVCs are different for the two objects. We conclude, as an analogy to the case of L1551 IRS 5, that the HVC is a well-collimated jet launched from the region close to the star and that the LVC is a disk wind with a wide opening angle. Detailed comparison of emission parameters between the two sources, however, suggests that part of the LVC emission from DG Tau arises from the gas entrained and accelerated by the HVC, if we assume continuous steady state outflows. The presence of two distinct emission components clearly separated in space and velocity may favor theoretical models with two outflows: one is the LVC magnetohydrodynamically driven near the inner edge of an accretion disk, and the other is the HVC driven by the reconnection of dipolar stellar magnetic fields anchored to the disk." @default.
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• W2126849377 date "2003-06-10" @default.
• W2126849377 modified "2023-10-16" @default.
• W2126849377 title "Adaptive Optics Spectroscopy of the [Fe<scp>ii</scp>] Outflow from DG Tauri" @default.
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• W2126849377 doi "https://doi.org/10.1086/374966" @default.
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