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Date and Time of the Query: 2019-04-25 T15:54:34 PDT
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For refcode 2002ApJ...578...90F:
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2002ApJ...578...90F Beyond the Bulge: A Fundamental Relation between Supermassive Black Holes and Dark Matter Halos Laura Ferrarese Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854; lff@physics.rutgers.edu Received 2002 January 15; accepted 2002 June 13 ABSTRACT The possibility that the masses M_BH_ of supermassive black holes (SBHs) correlate with the total gravitational mass of their host galaxy, or the mass M_DM_ of the dark matter halo in which they presumably formed, is investigated using a sample of 16 spiral and 20 elliptical galaxies. The bulge velocity dispersion {sigma}_c_, typically defined within an aperture of size R <~ 0.5 kpc, is found to correlate tightly with the galaxy's circular velocity v_c_, the latter measured at distances from the Galactic center at which the rotation curve is flat, R ~ 20-80 kpc. By using the well-known M_BH_-{sigma}_c_ relation for SBHs and a prescription to relate v_c_ to the mass of the dark matter halo M_DM_ in a standard {LAMBDA}CDM cosmology, the correlation between {sigma}_c_ and v_c_ is equivalent to one between M_BH_ and M_DM_. Such a correlation is found to be nonlinear, with the ratio M_BH_/M_DM_ decreasing from 2 x 10^-4^ for M_DM_ ~ 10^14^ M_sun_ to 10^-5^ for M_DM_ ~ 10^12^ M_sun_. Preliminary evidence suggests that halos of mass smaller than ~5 x 10^11^ M_sun_ are increasingly less efficient at forming SBHs - perhaps even unable to form them. Subject headings: black hole physics - dark matter - galaxies: halos - galaxies: nuclei
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