Black Holes at the Centers of Dwarf Galaxies

Details Black Holes at the Centers of Dwarf Galaxies Black Holes at the Centers of Dwarf Galaxies

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..195m&link_type=abstract

XMM-Newton Proposal ID #06558004

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Ngc 4117, 1225+0519, 0811+2328, 1009+2656

Scientific paper

We have discovered low-luminosity AGNs in over 30 bona fide dwarf galaxies. The 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 M_sun 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. Recent theoretical work suggests that at very low luminosities AGNs may lack obscuring tori and/or classical BLRs. We propose use XMM observations to test these models. The data will reveal whether or not the objects are obscured, which will forward our understanding of the physical nature of AGNs and the origin of their fundamental structure.

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