Issue |
A&A
Volume 397, Number 2, January II 2003
|
|
---|---|---|
Page(s) | 415 - 420 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20021552 | |
Published online | 17 December 2002 |
Strong gravitational lensing: Why no central black holes?
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
Corresponding author: cdm@class1.bao.ac.cn
Received:
12
July
2002
Accepted:
26
August
2002
We investigate how central black holes (BHs) in galactic
dark halos could affect strong gravitational lensing. The
distribution of integral lensing probability with image
separations are calculated for quasars of redshift 1.5 by
foreground dark matter halos. The mass density of dark halos is
taken to be the Navarro-Frenk-White (NFW) profile such that, when
the mass of a halo is less than , its central
black holes or a bulge is included as a point mass. The
relationship between the masses
of supermassive
black holes and the total gravitational mass
of
their host galaxy is adopted from the most recent literature. Only
a flat ΛCDM model is considered here. It is shown that,
while a single black hole for each galaxy contributes considerable
but not sufficient lensing probabilities at small image
separations compared with those without black holes, the bulges
(which are about 100–1000 times larger in mass than a typical
black hole) would definitely contribute enough probability at
small image separations, although it gives too high probabilities
at large separation angles compared with lensing observations.
Key words: gravitational lensing / physics black holes / galaxies: bulges
© ESO, 2003
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