Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0804m&link_type=abstract
American Astronomical Society, HEAD meeting #11, #8.04; Bulletin of the American Astronomical Society, Vol. 41, p.663
Astronomy and Astrophysics
Astronomy
Scientific paper
We have discovered low-luminosity AGNs in over 30 bona fide dwarf galaxies as part of an extensive spectroscopic survey. These objects are the least massive galaxies known to contain central black holes. Correspondingly, their black holes are almost certain to be in the 10^3 - 10^6 solar mass range critical for investigations into the co-evolution of galaxies and supermassive black holes. Surprisingly, all of the dwarf-galaxy AGNs we have found are faint, narrow-line (type 2) objects, and most are located in spheroidal host galaxies. One of the closest intermediate-mass black hole (IMBH) candidates uncovered in our survey is NGC 4117, an S0 galaxy with an absolute blue magnitude of -17.5 and a stellar mass of just over 10^10 solar masses. We compare the X-ray properties of NGC 4117 to those of classical Seyfert 2 galaxies and the prototypical IMBH galaxy NGC 4395.
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