Query : 2002A&A...382..792C

2002A&A...382..792C - Astronomy and Astrophysics, volume 382, 792-803 (2002/2-2)

A new method for the estimate of H0 from quadruply imaged gravitational lens systems.


Abstract (from CDS):

We present a new method to estimate the Hubble constant H0 from the measured time delays in quadruply imaged gravitational lens systems. We show how it is possible to get an estimate of H0 without the need to completely reconstruct the lensing potential thus avoiding any a priori hypothesis on the expression of the galaxy lens model. Our method only needs to assume that the lens potential may be expressed as rαF(θ), whatever the shape function F(θ) is, and it is thus able to fully explore the degeneracy in the mass modeLs taking also into account the presence of an external shear. We test the method on simulated cases and show that it does work well in recovering the correct value of the slope α of the radial profile and of the Hubble constant H0. Then, we apply the same method to the real quadruple lenses PG 1115+080 and B1422+231 obtaining H0=58+17–15km/s/Mpc (68% CL).

Abstract Copyright:

Journal keyword(s): gravitational lensing - cosmology: distance scale - quasars: individual: B1422+231 - quasars: individual: PG 1115+080

CDS comments: in ref list LAWRENCE 1992MNRAS.259p...5L instead of 1992MNRAS.259.5, PATNAIK A.R., BROWNE 1992MNRAS.259p...1P instead of MNRAS.259. 1

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 670 2
2 QSO B1422+2309 BLL 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 443 1
3 [PBW92] 1422+231 gLS 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 356 0
4 NVSS J160914+653229 rG 16 09 13.96 +65 32 28.8     19.4     ~ 204 1

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