Seyfert Activity and Nuclear Star Formation in the Circinus Galaxy

  title={Seyfert Activity and Nuclear Star Formation in the Circinus Galaxy},
  author={Roberto Maiolino and Alfred Krabbe and Niranjan Thatte and Reinhard Genzel},
  journal={The Astrophysical Journal},
We present high angular resolution (015-05) near-infrared images and spectroscopy of the Circinus galaxy, the closest Seyfert 2 galaxy known. The data reveal a nonstellar nuclear source at 2.2 μm whose radius is smaller than 1.5 pc. The coronal line region and the hot molecular gas emission extend for 20-50 pc in the ionization cone. The data do not show evidence for a pointlike concentration of dark mass; we set an upper limit of 4 × 106 M☉ to the mass of a putative black hole. We find… 
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