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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198577.0, MPI für Astronomie / Publikationen_mpia
Adaptive optics spectroscopy of the [Fe II] outflow from DG Tauri
Authors:Pyo, Tae-Soo; Kobayashi, Naoto; Hayashi, Masahiko; Terada, Hiroshi; Goto, Miwa; Takami, Hideki; Takato, Naruhisa; Gaessler, Wolfgang; Usuda, Tomonori; Yamashita, Takuya; Tokunaga, Alan T.; Hayano, Yutaka; Kamata, Yukiko; Iye, Masanori; Minowa, Yosuke
Date of Publication (YYYY-MM-DD):2003
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Volume:590
Start Page:340
End Page:347
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present results of the velocity-resolved
spectroscopy of the [Fe II] **lambda;1.644 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 0.16", 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 0.7" 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 0.2"-0.5" from
the star. The high-velocity component (HVC) peaks
at 0.6"-0.8" 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. Based on
data collected at Subaru Telescope, which is
operated by the National Astronomical Observatory
of Japan.
Free Keywords:ISM: Herbig-Haro Objects; ISM: Individual:
; Name: DG Tauri; ISM: Individual: Alphanumeric: HH
; 158; ISM: Jets and Outflows; Stars: Formation;
; Stars: Pre-Main-Sequence; Techniques: High Anular
; Resolution
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Telescope, National Astronomical Observatory of
Japan, 650 North A`oh**omacr;k**umacr; Place,
Hilo, HI 96720), AH(Subaru Telescope, National
Astronomical Observatory of Japan, 650 North
A`oh**omacr;k**umacr; Place, Hilo, HI 96720),
AI(Subaru Telescope, National Astronomical
Observatory of Japan, 650 North
A`oh**omacr;k**umacr; Place, Hilo, HI 96720),
AJ(Subaru Telescope, National Astronomical
Observatory of Japan, 650 North
A`oh**omacr;k**umacr; Place, Hilo, HI 96720),
AK(Institute for Astronomy, University of Hawaii,
2680 Woodlawn Drive, Honolulu, HI 96822),
AL(National Astronomical Observatory of Japan,
Mitaka, Tokyo 181-8588, Japan), AM(National
Astronomical Observatory of Japan, Mitaka, Tokyo
181-8588, Japan), AN(National Astronomical
Observatory of Japan, Mitaka, Tokyo 181-8588,
Japan), AO(Department of Astronomy, School of
Science, University of Tokyo, Tokyo 113-0033,
Japan)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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