The compact radio source Sgr A* is coincident with a 4 × 106 M ⊙ black hole at the dynamical center of the Galaxy and is surrounded by dense orbiting ionized and molecular gas. We present high-resolution radio continuum images of the central 3′ and report a faint continuous linear structure centered on Sgr A* with a P.A. 60°. The extension of this feature appears to be terminated symmetrically by two linearly polarized structures at 8.4GHz, 75″ from Sgr A*. A number of weak blobs of radio emission with X-ray counterparts are detected along the axis of the linear structure. The linear structure is best characterized by a mildly relativistic jet from Sgr A* with an outflow rate 10-6 M ⊙yr-1. The near and far sides of the jet are interacting with orbiting ionized and molecular gas over the last 1-3 hundred years and are responsible for a 2″ hole, the "minicavity," characterized by disturbed kinematics, enhanced Fe II/III line emission, and diffuse X-ray gas. The estimated kinetic luminosity of the outflow is 1.2 × 1041ergs-1, so the interaction with the bar may be responsible for the Galactic center X-ray flash inferred to be responsible for much of the fluorescent Fe Kα line emission from the inner 100pc of the Galaxy.
Bibliographical noteErratum can be found at Astrophysical Journal Letters volume 777(2), p 1, https://doi.org/10.1088/2041-8205/777/2/L39
- accretion, accretion disks
- black hole physics
- galaxy: center