2004ApJ...606L..93W


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST09:18:02

2004ApJ...606L..93W - Astrophys. J., 606, L93-L96 (2004/May-2)

Giant arc statistics in concord with a concordance lambda cold dark matter universe.

WAMBSGANSS J., BODE P. and OSTRIKER J.P.

Abstract (from CDS):

(ref???)The frequency of giant arcs–highly distorted and strongly gravitationally lensed background galaxies–is a powerful test for cosmological models. Previous comparisons of arc statistics for the currently favored concordance cosmological model (lambda cold dark matter [LCDM]) with observations have shown an apparently large discrepancy in underpredicting cluster arcs. We present new ray-shooting results, based on a high-resolution (10243 particles in a 320 h–1 Mpc box) large-scale structure simulation normalized to the Wilkinson Microwave Anisotropy Probe (WMAP) observations. We follow light rays through a pseudo-three-dimensional matter distribution approximated by up to 38 lens planes and evaluate the occurrence of arcs for various source redshifts. We find that the frequency of strongly lensed background galaxies is a steep function of source redshift: the optical depth for giant arcs increases by a factor of 5 when background sources are moved from redshift zs=1.0 to 1.5. This is a consequence of a small decrease of the critical surface mass density for lensing, combined with the very steep cluster mass function at the high-mass end plus a modest contribution from secondary lens planes. Our results are consistent with those of Bartelmann et al. if we–as they did–restrict all sources to be at zs=1. If we allow sources extending to or beyond zs≥1.5, the apparent discrepancy vanishes: the frequency of arcs increases by about a factor of 10 as compared to previous estimates, and results in roughly one arc per 20 deg2 over the sky, in good agreement with the observed frequency of arcs.

Abstract Copyright:

Journal keyword(s): Cosmology: Cosmological Parameters - Cosmology: Dark Matter - Galaxies: Clusters: General - Cosmology: Gravitational Lensing - methods: {em N}-body simulations - Methods: Numerical

Status at CDS:  

CDS comments: t.2 : RCS 2319-004 is a misprint for RCS J2319+0038

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 603 1
2 ClG J0224-0002 ClG 02 24 34.10 -00 02 30.9           ~ 48 1
3 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 636 0
4 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 118 0
5 ACO S 506 ClG 05 01 04.4 -24 24 41           ~ 57 0
6 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 795 1
7 2MASX J07473129-1917403 BiC 07 47 31.296 -19 17 40.34   19.60       ~ 393 1
8 ClG 0745-19 ClG 07 47 31.3 -19 17 40           ~ 364 0
9 ACO 963 ClG 10 17 09.6 +39 01 00           ~ 350 0
10 ClG J1347-1145 ClG 13 47 33.5 -11 45 42           ~ 463 0
11 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 348 0
12 ClG 1512.4+3647 ClG 15 14 22.0 +36 36 22     19.0     ~ 133 0
13 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 519 0
14 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 779 1
15 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 343 0
16 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 624 2
17 ClG 2236-04 ClG 22 39 35.6 -04 28 47           ~ 28 0
18 ACO S 1077 ClG 22 58 52.34 -34 46 54.6           ~ 179 0
19 ClG J2319+0038 ClG 23 19 53 +00 38.0           ~ 35 1

    Equat.    Gal    SGal    Ecl

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2020.05.27-09:18:02

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