Issue |
A&A
Volume 380, Number 1, December II 2001
|
|
---|---|---|
Page(s) | 31 - 39 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20011429 | |
Published online | 15 December 2001 |
On black hole masses, radio-loudness and bulge luminosities of Seyfert galaxies
1
Department of Astronomy, Peking University, Beijing 100871, PR China
2
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
3
The partner group of Max-Planck-Institut für Radioastronomie at National Astronomical Observatories of China e-mail: hjl@bao.ac.cn
Corresponding author: Xue-Bing Wu, wuxb@bac.pku.edu.cn
Received:
8
June
2001
Accepted:
19
September
2001
We estimated black hole masses for 9 Seyfert 1 and 13 Seyfert 2
galaxies in the Palomar and CfA bright Seyfert samples using the tight
correlation between black hole mass and bulge velocity dispersion.
Combining other 13 Seyfert 1s and 2 Seyfert 2s in these samples
but with black hole masses
measured recently by reverberation mapping and stellar/gas
dynamics, we studied
the correlations of black hole masses with
radio-loudness and bulge luminosities for a sample of 37 Seyfert galaxies.
We found that if
radio-loudness is measured using the optical and radio luminosities of
the nuclear components, the black hole masses
of radio-loud Seyfert 1s tend to increase with the radio-loudness.
The black hole masses of all Seyfert galaxies increase
with the radio power, but Seyfert galaxies have larger radio powers than
nearby galaxies with the same black hole masses.
In addition, the correlation between black hole masses
and bulge V-band luminosities for Seyfert galaxies is consistent with
that found for quasars and normal galaxies. The combined sample of 37 Seyfert galaxies,
15 quasars and 30 normal galaxies suggests a possible universal nonlinear relation
between black hole and bulge masses,
,
which is slightly steeper than that found recently
by Laor ([CITE]) for a smaller sample. This nonlinear relation is supported
by a larger sample including 65 Seyfert galaxies. The different
ratio for galaxies with different bulge
luminosities or different
black hole masses may be explained by this relation.
These results are consistent with some theoretical implications and are important for
understanding the nature of radio emissions
and the formation and evolution of supermassive black holes and galaxies.
Key words: black hole physics / galaxies: active / galaxies: nuclei / galaxies: Seyfert
© ESO, 2001
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