2008A&A...477..397G


Query : 2008A&A...477..397G

2008A&A...477..397G - Astronomy and Astrophysics, volume 477, 397-406 (2008/1-2)

Cosmological parameters from strong gravitational lensing and stellar dynamics in elliptical galaxies.

GRILLO C., LOMBARDI M. and BERTIN G.

Abstract (from CDS):

Observations of the cosmic microwave background, light element abundances, large-scale distribution of galaxies, and distant supernovae are the primary tools for determining the cosmological parameters that define the global structure of the Universe. Here we illustrate how the combination of observations related to strong gravitational lensing and stellar dynamics in elliptical galaxies offers a simple and promising way to measure the cosmological matter and dark-energy density parameters. A gravitational lensing estimate of the mass enclosed inside the Einstein circle can be obtained by measuring the Einstein angle, once the critical density of the system is known. A model-dependent dynamical estimate of this mass can also be obtained by measuring the central velocity dispersion of the stellar component. By assuming the well-tested homologous 1/r2 (isothermal) profile for the total (luminous+dark) density distribution in elliptical galaxies acting as lenses, these two mass measurements can be properly compared. Thus, a relation between the Einstein angle and the central stellar velocity dispersion is derived, and the cosmological matter and the dark-energy density parameters can be estimated from this. We determined the accuracy of the cosmological parameter estimates by means of simulations that include realistic measurement uncertainties on the relevant quantities. Interestingly, the expected constraints on the cosmological parameter plane are complementary to those coming from other observational techniques. Then, we applied the method to the recent data sets of the Sloan Lens ACS (SLACS) and the Lenses Structure and Dynamics (LSD) Surveys, and showed that the concordance value between 0.7 and 0.8 for the dark-energy density parameter is included in our 99% confidence regions. The small number of lenses available to date prevents us from precisely determining the cosmological parameters, but it still proves the feasibility of the method. When applied to samples made of hundreds of lenses that are expected to become available from forthcoming deep and wide surveys, this technique will be an important alternative tool for measuring the geometry of the Universe.

Abstract Copyright:

Journal keyword(s): cosmology: theory - cosmology: observations - galaxies: distances and redshifts - galaxies: kinematics and dynamics - galaxies: elliptical and lenticular, cD - gravitational lensing

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 2MASX J00375322-0942202 GiC 00 37 53.2145165976 -09 42 20.158898652   18.57 18.06   16.26 ~ 25 1
2 QSO B0047-2808 G 00 49 41.896 -27 52 25.35   21.2   20.1   ~ 38 1
3 DES J021652.54-081345.3 GiC 02 16 52.5460001904 -08 13 45.314813820   19.91 18.36   16.93 ~ 23 1
4 CFRS 03.1077 G 03 02 32.59 +00 06 00.0           ~ 24 1
5 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 714 1
6 NGC 1549 GiP 04 15 45.223 -55 35 32.50 11.22 10.48 9.79 9.08   ~ 230 1
7 SLACS SDSS J0737+3216 lens rG 07 37 28.4499521544 +32 16 18.593106384   20.17 18.34   17.04 ~ 26 1
8 3XMM J091205.4+002900 LIN 09 12 05.3091659568 +00 29 01.201406532   17.91 16.56   15.57 ~ 30 1
9 FIRST J095629.8+510006 BiC 09 56 29.7839946192 +51 00 06.309257544   19.26 17.90   16.68 ~ 26 1
10 SDSS J095944.06+041017.0 G 09 59 44.0693722248 +04 10 17.036993460   19.14 17.94   16.92 ~ 22 1
11 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1424 0
12 NGC 4278 LIN 12 20 06.8253868 +29 16 50.713486 11.54 11.09 10.16     ~ 917 2
13 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1703 2
14 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 2029 2
15 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6705 3
16 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1077 1
17 SDSS J125028.26+052349.0 G 12 50 28.2624714720 +05 23 49.075233504   19.19 17.77   16.70 ~ 20 1
18 2dFGRS TGN265Z189 GiC 13 30 45.5278367400 -01 48 41.586194484   18.91 17.56 17.543 16.99 ~ 18 1
19 SDSS J140228.21+632133.4 rG 14 02 28.2190035864 +63 21 33.299741304   19.07 17.51   16.33 ~ 27 1
20 EGSIRAC J141735.72+522646.0 G 14 17 35.70 +52 26 45.9   24.04 21.53 21.38 19.971 ~ 60 1
21 [MMN2007] A1 gLS 14 17 35.9 +52 26 46     21.53   19.69 ~ 80 0
22 2MASX J14201586+6019147 Sy2 14 20 15.8583744984 +60 19 14.601408852   16.88 15.94   15.08 ~ 18 1
23 H 1543+535 G 15 43 20.9 +53 51 52           ~ 17 1
24 NAME HST 15433+5352 System gLS 15 43 20.9 +53 51 52           ~ 19 0
25 SDSS J162746.44-005357.5 G 16 27 46.4442031920 -00 53 57.542699832   19.42 17.87   16.91 ~ 25 1
26 SDSS J163028.15+452036.2 G 16 30 28.1580942120 +45 20 36.241137780   19.76 18.08   16.79 ~ 22 1
27 [LSS84] 2016+112 D G 20 19 18.07 +11 27 13.2           ~ 34 1
28 SDSS J230053.14+002238.0 G 23 00 53.1509681304 +00 22 37.970088744   19.80 18.19   17.07 ~ 24 1
29 SDSS J230321.72+142217.9 G 23 03 21.7279540536 +14 22 17.928240960   17.96 16.77   16.10 ~ 23 1
30 2MASX J23212094-0939099 LIN 23 21 20.9352730488 -09 39 10.318081968   16.76 15.27 15.35 14.66 ~ 24 1

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2022.08.15-15:07:58

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