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Despite strong physical reasons that they should exist and decades of search,jets from the Galactic Center Black Hole, Sgr A*, have not yet beenconvincingly detected. Based on high-resolution Very Large Array images andultra-deep imaging-spectroscopic data produced by the Chandra X-rayObservatory, we report new evidence for the existence of a parsec-scale jetfrom Sgr A*, by associating a linear feature G359.944-0.052, previouslyidentified in X-ray images of the Galactic Center, with a radio shock front onthe Eastern Arm of the Sgr A West HII region. We show that the shock front canbe explained in terms of the impact of a jet having a sharp momentum peak alongthe Galaxy's rotation axis, whereas G359.944-0.052, a quasi-steady feature witha power-law spectrum, can be understood as synchrotron radiation fromshock-induced ultrarelativistic electrons cooling in a finite post-shock regiondownstream along the jet path. Several interesting implications of the jetproperties are discussed.

Evidence for A Parsec-scale Jet from The Galactic Center Black Hole: Interaction with Local Gas