An optical time delay estimate for the double gravitational lens system B1600+434

被引:69
作者
Burud, I
Hjorth, J
Jaunsen, AO
Andersen, MI
Korhonen, H
Clasen, JW
Pelt, J
Pijpers, FP
Magain, P
Ostensen, R
机构
[1] Inst Astrophys & Geophys, B-4000 Liege, Belgium
[2] Univ Copenhagen, Astron Observ, DK-2100 Copenhagen O, Denmark
[3] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway
[4] Univ Oulu, Div Astron, FIN-90014 Oulun Yliopisto, Finland
[5] Nord Opt Telescope, E-38700 Santa Cruz De La Palma, Canary Islands, Spain
[6] Tartu Astrophys Observ, EE-61602 Toravere, Estonia
[7] Aarhus Univ, Theoret Astrophys Ctr, DK-8000 Aarhus C, Denmark
[8] Univ Tromso, Dept Phys, Tromso, Norway
关键词
cosmology : observations; distance scale; galaxies : spiral; gravitational lensing; quasars : individual (B1600+434);
D O I
10.1086/317213
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between 1998 April and 1999 November. The photometry has been performed by simultaneous deconvolution of all the data frames, involving a numerical lens galaxy model. Four methods have been applied to determine the time delay between the two QSO components, giving a mean estimate of Deltat = 51 +/- 4 days (95% confidence level). This is the fourth optical time delay ever measured. Adopting a Omega = 0.3, Lambda = 0 universe and using the mass model of Mailer et al., this time delay estimate yields a Hubble parameter of H-0 = 52(-8)(+14) km s(-1) Mpc(-1) (95% confidence level), where the errors include time delay as well as model uncertainties. There are time-dependent offsets between the two (appropriately shifted) light curves that indicate the presence of external variations due to microlensing.
引用
收藏
页码:117 / 122
页数:6
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