Issue |
A&A
Volume 399, Number 3, March I 2003
|
|
---|---|---|
Page(s) | 869 - 878 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20021869 | |
Published online | 14 February 2003 |
The black hole mass of low redshift radiogalaxies
1
INAF – Osservatorio Astronomico di Padova vicolo Osservatorio 5 Padova, Italy e-mail: falomo@pd.astro.it, fasano@pd.astro.it
2
Istituto di Radioastronomia di Bologna and Dipartimento di Astronomia, Universitá di Bologna, Italy e-mail: fgovoni@ira.bo.cnr.it
Corresponding author: D. Bettoni, bettoni@pd.astro.it
Received:
9
July
2002
Accepted:
3
December
2002
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 () 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 from ~
to ~
(average
8.9).
is found to be proportional to the mass
of the bulge (
). The distribution of the ratio
/
has a mean value of
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
(or
)
and the radio power at 5 GHz.
Key words: black hole physics / galaxies: active / galaxies: nuclei / radio continuum: galaxies
© ESO, 2003
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