The black hole mass of low redshift radiogalaxies - INSPIRE

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The black hole mass of low redshift radiogalaxies

Dec, 2002

11 pages

Published in:

Astron.Astrophys. 399 (2003) 869-878

e-Print:

astro-ph/0212162 [astro-ph]

DOI:

10.1051/0004-6361:20021869

View in:

ADS Abstract Service

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Abstract: (arXiv)

We make use of two empirical relations between the black hole mass and the global properties (bulge luminosity and stellar velocity dispersion) of nearby elliptical galaxies, to infer the mass of the central black hole (M_BH) in low redshift radiogalaxies. Using the most recent determinations of black hole masses for inactive early type galaxies we show that the bulge luminosity and the central velocity dispersion are almost equally correlated (similar scatter) with the central black-hole mass. Applying these relations to two large and homogeneous datasets of radiogalaxies we find that they host black-holes whose mass ranges between ~5x10^7 to ~6x10^9 M_sun (average ~8.9). M_BH is found to be proportional to the mass of the bulge (M_bulge). The distribution of the ratio M_BH/M_bulge has a mean value of 8x10^{-4} and shows a scatter that is consistent with that expected from the associated errors. At variance with previous claims no significant correlation is instead found between M_BH (or M_bulge) and the radio power at 5GHz.

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