Issue |
A&A
Volume 409, Number 2, October II 2003
|
|
---|---|---|
Page(s) | 449 - 457 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20031158 | |
Published online | 17 November 2003 |
Arc statistics in cosmological models with dark energy
1
Max-Planck-Institut für Astrophysik, PO Box 1317, 85741 Garching, Germany
2
Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, 35122 Padova, Italy
3
Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
4
Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
5
SISSA/ISAS, via Beirut 4, 34014 Trieste, Italy
6
Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy
Corresponding author: M. Bartelmann, msb@mpa-garching.mpg.de
Received:
2
October
2002
Accepted:
18
July
2003
We investigate how the probability of the formation of giant arcs
in galaxy clusters is expected to change in cosmological models
dominated by dark energy with an equation of state
compared to cosmological-constant or open models. To do so, we use
a simple analytic model for arc cross sections based on the
Navarro-Frenk-White density profile which we demonstrate reproduces
essential features of numerically determined arc cross
sections. Since analytic lens models are known to be inadequate for
accurate absolute quantifications of arc probabilities, we use them
only for studying changes relative to cosmological-constant
models. Our main results are (1) the order of magnitude difference
between the arc probabilities in low density, spatially flat and
open CDM models found numerically is reproduced by our analytic
model, and (2) dark-energy cosmologies with
increase the arc
optical depth by at most a factor of two and are thus unlikely to
reconcile arc statistics with spatially flat cosmological models
with low matter density.
Key words: galaxies: clusters: general / cosmology: theory / cosmology: dark matter / cosmology: gravitational lensing
© ESO, 2003
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