A 3pc scale jet-driven outflow from SGR A*

F. Yusef-Zadeh, R. Arendt, H. Bushouse, W. Cotton, D. Haggard, M. W. Pound, D. A. Roberts, M. Royster, M. Wardle

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40 Citations (Scopus)


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.

Original languageEnglish
Article numberL11
Pages (from-to)1-8
Number of pages8
JournalAstrophysical Journal Letters
Issue number1
Publication statusPublished - 10 Oct 2012

Bibliographical note

Erratum 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


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