Title: Studying the Origin of Outflows from YSOs with SUBARU and GEMINI 
Author(s): Tae-Soo Pyo and Masahiko Hayashi
Abstract:
We have been studying the kinematics and structure of jets at their bases 
by analyzing the near-infrared [Fe II] (1.644 micron) emission line with 
high-angular resolutions using IRCS (+ AO) of SUBARU telescope.  In the 
position-velocity diagrams (PVDs) of L1551 IRS 5, DG Tau, RW Aur, and HL 
tau toward their blueshifted jets, the blueshifted [Fe II] emission showed 
two clearly distinct components in velocity and space: the high velocity 
component (HVC: V = 200-400 km/s) is extended and has a narrow line width, 
while the low velocity component (LVC: V = 50-200 km/s) is observed closer 
to the driving sources and shows a larger line width. These characteristics 
are well understood in terms of the two types of outflow mechanisms that 
are working simultaneously: one is the HVC, which is launched in a narrow, 
inner radial region at < 0.1 AU, and the other is the LVC, which is launched 
in a wider, outer radial region from within 0.-4.5 AU of the accretion disk. 
To expand our study to know more detail structure at the base of the star-disk 
system, we observed and compared He I, Pa_beta, and [Fe II] emission lines 
in J-band by using NIFS IFU of GEMINI telescope. We will also introduce the 
results from NIFS/GEMINI.