A Very Compact Extremely High Velocity Flow toward MMS 5 / OMC-3
  Revealed with ALMA
  Both high- and low-velocity outflows are occasionally observed around a
protostar by molecular line emission. The high-velocity component is called
`Extremely High-Velocity (EHV) flow,' while the low-velocity component is
simply referred as `(molecular) outflow.' This study reports a newly found EHV
flow and outflow around MMS $5$ in the Orion Molecular Cloud 3 observed with
ALMA. In the observation, CO $J$=2--1 emission traces both the EHV flow
($|v_{\rm{LSR}} - v_{\rm{sys}}|$ $\simeq$ 50--100 $\rm{km\ s^{-1}}$) and
outflow ($|v_{\rm{LSR}} - v_{\rm{sys}}|$ $\simeq$ 10--50 $\rm{km\ s^{-1}}$). On
the other hand, SiO $J$=5--4 emission only traces the EHV flow. The EHV flow is
collimated and located at the root of the V-shaped outflow. The CO outflow
extends up to $\sim$ 14,000\,AU with a position angle (P.A.) of $\sim79^\circ$
and the CO redshifted EHV flow extends to $\sim$11,000 AU with P.A.
$\sim96^\circ$. The EHV flow is smaller than the outflow, and the dynamical
timescale of the EHV flow is shorter than that of the outflow by a factor of
$\sim 3$. The flow driving mechanism is discussed based on the size, time
scale, axis difference between the EHV flow and outflow, and the periodicity of
the knots. Our results are consistent with the nested wind scenario, although
the jet entrainment scenario could not completely be ruled out.
