A low - mass central black hole in the bulgeless Seyfert 1 galaxy NGC 4395

@article{Filippenko2003AL,
  title={A low - mass central black hole in the bulgeless Seyfert 1 galaxy NGC 4395},
  author={A. Filippenko and L. Ho},
  journal={The Astrophysical Journal},
  year={2003},
  volume={588}
}
NGC 4395 is one of the least luminous and nearest known type 1 Seyfert galaxies, and it also lacks a bulge. We present a Hubble Space Telescope (HST) I-band image of its nuclear region and Keck high-resolution (~8 km s-1) echelle spectra containing the Ca II near-infrared triplet. In addition to the unresolved point source, there is a nuclear star cluster of size r ≈ 3.9 pc; the upper limit on its velocity dispersion is only 30 km s-1. We thus derive an upper limit of ~6.2 × 106 M☉ for the mass… Expand
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