Issue |
A&A
Volume 418, Number 2, May I 2004
|
|
---|---|---|
Page(s) | 387 - 392 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20040049 | |
Published online | 09 April 2004 |
Flux-limited strong gravitational lensing and dark energy
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
Corresponding author: cdm@bao.ac.cn
Received:
23
June
2003
Accepted:
15
January
2004
In the standard flat cosmological constant (Λ)
cold dark matter (CDM) cosmology, a model of two populations of
lens halos for strong gravitational lensing can reproduce the
results of the Jodrell-Bank VLA Astrometric Survey (JVAS) and the
Cosmic Lens All-Sky Survey (CLASS) radio survey. In such a model,
lensing probabilities are sensitive to three parameters: the
concentration parameter c1, the cooling mass scale Mc and the value of the CDM power spectrum
normalization parameter . The value ranges of these
parameters are constrained by various observations. However, we
found that predicted lensing probabilities are also quite
sensitive to the flux density (brightness) ratio
of the multiple lensing images, which has been a very important
selection criterion of a sample in any lensing survey experiments.
We re-examine the mentioned above model by considering the flux
ratio and galactic central Super Massive Black Holes (SMBHs), in
flat, low-density cosmological models with different cosmic
equations of state ω, and find that the predicted lensing
probabilities without considering
are
over-estimated. A low value of qr can be compensated
for by raising the cooling mass scale Mc in fitting
the predicted lensing probabilities to JVAS/CLASS observations. To
determine the cosmic equation of state ω, the uncertainty
in Mc must be resolved. The effects of SMBHs cannot be
detected by strong gravitational lensing methods when
.
Key words: cosmology: theory / cosmology: gravitational lensing
© ESO, 2004
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