2008A&A...489...23L


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST15:50:03

2008A&A...489...23L - Astronomy and Astrophysics, volume 489, 23-35 (2008/10-1)

Strong lensing in Abell 1703: constraints on the slope of the inner dark matter distribution.

LIMOUSIN M., RICHARD J., KNEIB J.-P., BRINK H., PELLO R., JULLO E., TU H., SOMMER-LARSEN J., EGAMI E., MICHALOWSKI M.J., CABANAC R. and STARK D.P.

Abstract (from CDS):

Properties of dark matter haloes can be probed observationally and numerically, and comparing both approaches provides ways to constrain cosmological models. When it comes to the inner part of galaxy cluster scale haloes, interaction between the baryonic and the dark matter component is an important issue that is far from being fully understood. With this work, we aim to initiate a program coupling observational and numerical studies to probe the inner part of galaxy clusters. In this article, we apply strong lensing techniques on Abell 1703, a massive X-ray luminous galaxy cluster at z=0.28. Our analysis is based on imaging data from both the space and ground in 8 bands, complemented by a spectroscopic survey. Abell 1703 is rather circular from the general shape of its multiply imaged systems and is dominated by a giant elliptical cD galaxy in its centre. This cluster exhibits a remarkable bright central ring formed by 4 images at zspec=0.888 only 5-13'' away from the cD centre. This unique feature offers a rare lensing constrain for probing the central mass distribution. The stellar contribution from the cD galaxy (∼1.25x1012M within 30kpc) is accounted for in our parametric mass modelling, and the underlying smooth dark matter component distribution is described using a generalized nfw profile parametrized with a central logarithmic slope α. The rms of our mass model in the image plane is equal to 1.4''. We find that within the range where observational constraints are present (from ∼20kpc to ∼210kpc), α is equal to 1.09+0.05–0.11 (3σ confidence level). The concentration parameter is equal to c200∼3.5, and the scale radius is constrained to be larger than the region where observational constraints are available (rs=730+15–75kpc). The 2D mass is equal to M(210kpc)=2.4x1014M. However, we cannot draw any conclusions on cosmological models at this point since we lack results from realistic numerical simulations containing baryons to make a proper comparison. We advocate the need for a large sample of well observed (and well constrained) and simulated unimodal relaxed galaxy clusters in order to make reliable comparisons and to potentially provide a test of cosmological models.

Abstract Copyright:

Journal keyword(s): gravitational lensing - galaxies: clusters: individual: Abell 1703 - dark matter

Nomenclature: Figs, Table 1: [LRK2008] NN.N N=42.

Simbad objects: 52

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Number of rows : 52

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 68 ClG 00 37 06.2 +09 09 33           ~ 164 0
2 ACO 383 ClG 02 48 06.9 -03 29 32           ~ 310 0
3 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1039 0
4 [LRK2008] 6.3 LeI 13 15 01.56 +51 49 10.1           ~ 2 0
5 [LRK2008] 9.3 LeI 13 15 01.95 +51 49 37.5         26.92 ~ 4 0
6 [LRK2008] 3.3 LeI 13 15 01.98 +51 49 47.4         25.34 ~ 3 0
7 [LRK2008] 8.3 LeI 13 15 02.07 +51 49 38.6         25.07 ~ 4 0
8 [LRK2008] 7.3 LeI 13 15 02.09 +51 49 41.3         26.81 ~ 4 0
9 [LRK2008] 5.2 LeI 13 15 02.50 +51 49 29.6           ~ 5 0
10 [LRK2008] 4.2 LeI 13 15 02.58 +51 49 29.5           ~ 5 0
11 [LRK2008] 1.5 LeI 13 15 02.89 +51 48 47.9           ~ 4 0
12 [LRK2008] 11.3 LeI 13 15 02.98 +51 48 34.3         23.55 ~ 4 0
13 [LRK2008] 10.3 LeI 13 15 02.98 +51 48 34.3           ~ 3 0
14 [LRK2008] 15.1 LeI 13 15 03.08 +51 48 44.9         24.89 ~ 5 0
15 [LRK2008] 16.1 LeI 13 15 03.25 +51 48 41.9           ~ 5 0
16 [LRK2008] 4.1 LeI 13 15 03.75 +51 49 35.5           ~ 4 0
17 [LRK2008] 5.1 LeI 13 15 03.84 +51 49 36.4           ~ 4 0
18 [LRK2008] 8.2 LeI 13 15 03.86 +51 49 46.2         23.06 ~ 4 0
19 [LRK2008] 7.2 LeI 13 15 03.87 +51 49 48.4           ~ 3 0
20 [LRK2008] 3.2 LeI 13 15 03.92 +51 49 54.8           ~ 3 0
21 [LRK2008] 9.2 LeI 13 15 04.06 +51 49 46.5         25.32 ~ 4 0
22 [LRK2008] 3.1 LeI 13 15 04.07 +51 49 55.4         22.69 ~ 4 0
23 [LRK2008] 15.2 LeI 13 15 04.09 +51 49 16.6           ~ 4 0
24 [LRK2008] 16.2 LeI 13 15 04.26 +51 49 15.6           ~ 4 0
25 [LRK2008] 6.2 LeI 13 15 04.54 +51 49 32.9           ~ 3 0
26 [LRK2008] 2.3 LeI 13 15 04.73 +51 48 42.7         26.15 ~ 5 0
27 [LRK2008] 7.1 LeI 13 15 04.98 +51 49 51.1           ~ 3 0
28 2MASX J13150513+5149022 BiC 13 15 05.138 +51 49 02.28           ~ 7 1
29 [LRK2008] 2.2 LeI 13 15 05.17 +51 48 42.3         25.29 ~ 5 0
30 ACO 1703 ClG 13 15 05.2 +51 49 02           ~ 124 0
31 [LRK2008] 9.1 LeI 13 15 05.22 +51 49 49.1         26.68 ~ 4 0
32 [LRK2008] 8.1 LeI 13 15 05.40 +51 49 49.6         24.95 ~ 4 0
33 [BHG2011] A1703 A3 LeG 13 15 05.79 +51 49 05.5           ~ 5 0
34 [BHG2011] A1703 A4 LeG 13 15 05.96 +51 49 11.2           ~ 5 0
35 [LRK2008] 15.4 LeI 13 15 06.05 +51 48 41.6           ~ 4 0
36 [LRK2008] 16.4 LeI 13 15 06.14 +51 48 40.6           ~ 4 0
37 [LRK2008] 5.3 LeI 13 15 06.22 +51 49 41.1           ~ 4 0
38 [LRK2008] 4.3 LeI 13 15 06.40 +51 49 40.7           ~ 4 0
39 [BHG2011] A1703 A1 LeG 13 15 06.41 +51 49 03.6           ~ 5 0
40 [BHG2011] A1703 A2 LeG 13 15 06.54 +51 49 09.6         22.19 ~ 6 0
41 [LRK2008] 6.1 LeI 13 15 07.16 +51 49 35.0         23.56 ~ 4 0
42 [LRK2008] 10.2 LeI 13 15 08.04 +51 48 41.0           ~ 4 0
43 [LRK2008] 11.2 LeI 13 15 08.55 +51 48 44.9           ~ 4 0
44 [LRK2008] 11.1 LeI 13 15 08.76 +51 48 47.6           ~ 3 0
45 [LRK2008] 10.1 LeI 13 15 08.90 +51 48 51.3         21.40 ~ 5 0
46 [LRK2008] 15.3 LeI 13 15 09.17 +51 49 18.3         25.44 ~ 5 0
47 [LRK2008] 16.3 LeI 13 15 09.21 +51 49 15.5           ~ 5 0
48 ClG J1347-1145 ClG 13 47 33.5 -11 45 42           ~ 488 0
49 Feige 92 * 14 11 31.8784449873 +50 07 04.145893027   11.42 11.50     B9kp 40 0
50 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 782 1
51 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 162 0
52 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 353 0

    Equat.    Gal    SGal    Ecl

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2021.04.19-15:50:03

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