Detecting Low-Mass Supermassive Black Holes
  We demonstrate the feasibility of uncovering supermassive black holes in late-type, quiescent spiral galaxies by detecting signs of very low-level nuclear activity. We use a combination of x-ray selection and multi-wavelength follow-up. Here, we apply this technique to NGC 3184 and NGC 5457, both of type Scd, and show that strong arguments can be made that both host AGNs. 
Himel Ghosh (1), Smita Mathur (1), Fabrizio Fiore (2), Laura Ferrarese   (3) ((1) Ohio State University, (2) INAF - Osservat...