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

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dc.creatorBurud, I.
dc.creatorHjorth, J.
dc.creatorJaunsen, A. O.
dc.creatorAndersen, M. I.
dc.creatorKorhonen, H.
dc.creatorClasen, J. W.
dc.creatorPelt, J.
dc.creatorPijpers, F. P.
dc.creatorMagain, P.
dc.creatorOEstensen, R.
dc.date2000-07-11
dc.date.accessioned2026-07-07T01:54:21Z
dc.date.available2026-07-07T01:54:21Z
dc.descriptionWe present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between April 1998 and November 1999. 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 Δ_t = 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 Maller et al. (2000), this time-delay estimate yields a Hubble parameter of H_0=52 (+14, -8) 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.
dc.description15 pages, 4 figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0007136
dc.identifierhttp://arxiv.org/abs/astro-ph/0007136
dc.identifierAstrophys.J. 544 (2000) 117-122
dc.identifierdoi:10.1086/317213
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1312
dc.subjectAstrophysics
dc.titleAn optical time-delay estimate for the double gravitational lens system B1600+434
dc.typetext

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