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

被引:19
|
作者
Cardone, VF
Capozziello, S
Re, V
Piedipalumbo, E
机构
[1] Univ Salerno, Dipartimento Fis ER Caianiello, I-84081 Baronissi, Salerno, Italy
[2] Ist Nazl Fis Nucl, Sez Napoli, Grp Collegato Salerno, I-84081 Baronissi, Salerno, Italy
[3] Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy
[4] Complesso Univ Monte S Angelo, Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy
关键词
gravitational lensing; cosmology : distance scale; quasars : individual : B1422+231; quasars : individual : PG 1115+080;
D O I
10.1051/0004-6361:20011682
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new method to estimate the Hubble constant H-0 from the measured time delays in quadruply imaged gravitational lens systems. We show how it is possible to get an estimate of H-0 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 r(alpha) F(theta), whatever the shape function F(theta) 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 alpha of the radial profile and of the Hubble constant H-0. Then, we apply the same method to the real quadruple lenses PG 1115+080 and B1422+231 obtaining H-0 = 58(-15)(+17) km s(-1) Mpc(-1) (68% CL).
引用
收藏
页码:792 / 803
页数:12
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