Статья

Adaptive Optics Spectroscopy of the [Fe<scp>ii</scp>] Outflow from DG Tauri

Tae‐Soo PyoSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Naoto KobayashiSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Masahiko HayashiSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Hiroshi TeradaSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Miwa GotoSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Hideki TakamiSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Naruhisa TakatoSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Wolfgang GäesslerSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720T. UsudaSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720Takuya YamashitaSubaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720A. T. TokunagaInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822Y. HayanoNational Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, JapanYukiko KamataNational Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, JapanMasanori IyeNational Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, JapanYosuke MinowaDepartment of Astronomy, School of Science, University of Tokyo, Tokyo 113-0033, Japan

2003en

ABI

Аннотация

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.

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Идентификаторы

DOI: 10.1086/374966

Цитирования и источники

Цитирований: 3Использованных источников: 0

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