Evidence for a jet and outflow from Sgr A*: a continuum and spectral
  line study
  We study the environment of Sgr A* using spectral and continuum observations
with the ALMA and VLA. Our analysis of sub-arcsecond H30alpha, H39alpha,
H52alpha and H56alpha line emission towards Sgr A* confirm the recently
published broad peak ~500 km/s~spectrum toward Sgr~A*. We also detect emission
at more extreme radial velocities peaking near -2500 and 4000 km/s, within
0.2''. We then present broad band radio continuum images at multiple
frequencies on scales from arcseconds to arcminutes. A number of elongated
continuum structures lie parallel to the Galactic plane, extending from ~0.4''
to 10'. We note a nonthermal elongated structure on an arcminute scale
emanating from Sgr A* at low frequencies between 1 and 1.4 GHz where thermal
emission from the mini-spiral is depressed by optical depth effects. The
position angle of this elongated structure and the sense of motion of ionized
features with respect to Sgr A* suggest a symmetric, collimated jet emerging
from Sgr A* with an opening angle of ~30deg and a position angle of ~60deg
punching through the medium before accelerating a significant fraction of the
orbiting ionized gas to high velocities. The jet with estimated mass flow rate
~1.4x10^{-5} solar mass/yr emerges perpendicular to the equatorial plane of the
accretion flow near the event horizon of Sgr A* and runs along the Galactic
plane. To explain a number of east-west features near Sgr A*, we also consider
the possibility of an outflow component with a wider-angle launched from the
accretion flow at larger radii.
