2006A&A...460..647D


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST10:58:36

2006A&A...460..647D - Astronomy and Astrophysics, volume 460, 647-652 (2006/12-4)

A simple analysis of halo density profiles using gravitational lensing time delays.

DOBKE B.M. and KING L.J.

Abstract (from CDS):

Gravitational lensing time delays depend upon the Hubble constant and the density distribution of the lensing galaxies. This allows one to either model the lens and estimate the Hubble constant, or to use a prior on the Hubble constant from other studies and investigate what the preferred density distribution is. Some studies have required compact dark matter halos (constant M/L ratio) in order to reconcile gravitational lenses with the HST/WMAP value of the Hubble constant (72±8km/s/Mpc and 72±5km/s/Mpc, respectively). This is in direct contradiction with X-ray, stellar dynamical, and weak lensing studies, which all point towards extended halos and isothermal density profiles. In this work, we examine an up-to-date sample of 13 lensing galaxies resulting in a data set consisting of 21 time delays. We select systems in which there is a single primary lensing galaxy (e.g. excluding systems undergoing mergers). Analysis is performed using analytic models based upon a power-law density profile (ρ∝r–η) of which the isothermal profile is a special case (η=2). This yields a value of η=2.11±0.12 (3σ) for the mean profile when modeling with a prior on the Hubble constant, which is only consistent with isothermality within 3σ. Note that this is a formal error from our calculations, and does not include the impact of sample selection or simplifications in the lens modeling. We conclude that time delays are a useful probe of density profiles, in particular as a function of the environment in which the lens resides, when combined with a prior on the Hubble constant.

Abstract Copyright:

Journal keyword(s): gravitational lensing - cosmology: cosmological parameters - cosmology: dark matter - galaxies: halos

Simbad objects: 21

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Number of rows : 21

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 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 505 3
2 [VV2006] J043814.8-122314 QSO 04 38 14.88 -12 17 14.6     17.15     ~ 176 2
3 QSO B0908+0603 QSO 09 11 27.6052 +05 50 54.281   18.44 18.16     ~ 210 2
4 [VV98] J095122.6+263513 QSO 09 51 22.5840 +26 35 13.786   17.66 17.31     ~ 96 1
5 8C 0958+561 QSO 10 01 20.6915852239 +55 53 55.595776916   17.16 16.95     ~ 701 3
6 QSO B1104-181 QSO 11 06 33.39 -18 21 23.8   15.8 15.9 15.7   ~ 302 1
7 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 627 2
8 QSO B1115+080B QSO 11 18 16.98 +07 45 55.7   18.74 18.1     ~ 50 0
9 QSO B1115+080C QSO 11 18 17.00 +07 45 57.7   18.26 17.6     ~ 52 0
10 [PBW92] 1422+231 C LeI 14 24 38.07 +22 55 59.9           ~ 46 0
11 [PBW92] 1422+231 B LeI 14 24 38.09 +22 56 00.6           ~ 47 0
12 [PBW92] 1422+231 A LeI 14 24 38.12 +22 56 00.9           ~ 45 0
13 QSO B1520+530 QSO 15 21 44.8 +52 54 49   18.2       ~ 117 2
14 QSO B1600+4344 QSO 16 01 40.4818 +43 16 47.394   22.12 21.92     ~ 177 1
15 [MFD95] 1608+656 D LeG 16 09 13.7741 +65 32 27.742           ~ 21 0
16 [MFD95] 1608+656 A LeG 16 09 13.9559 +65 32 28.999           ~ 22 0
17 [MFD95] 1608+656 B LeG 16 09 14.0749 +65 32 27.037           ~ 21 0
18 [MFD95] 1608+656 C LeG 16 09 14.0759 +65 32 28.546           ~ 21 0
19 NAME 3C 330G2 Sy2 16 09 35.0 +65 56 39   20.33       ~ 253 1
20 QSO B1830-211 QSO 18 33 39.92 -21 03 39.9     18.70 21   ~ 553 6
21 QSO B2149-2745 QSO 21 52 07.4534 -27 31 49.718   18.70 18.39     ~ 97 2

    Equat.    Gal    SGal    Ecl

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2020.10.24-10:58:36

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