The time delay of the quadruple quasar RX J0911.4+0551

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dc.creatorHjorth, Jens
dc.creatorBurud, Ingunn
dc.creatorJaunsen, Andreas O.
dc.creatorSchechter, Paul L.
dc.creatorKneib, Jean-Paul
dc.creatorAndersen, Michael I.
dc.creatorKorhonen, Heidi
dc.creatorClasen, Jacob W.
dc.creatorKaas, A. Amanda
dc.creatorØstensen, Roy
dc.creatorPelt, Jaan
dc.creatorPijpers, Frank P.
dc.date2002-05-08
dc.date.accessioned2026-07-07T02:03:36Z
dc.date.available2026-07-07T02:03:36Z
dc.descriptionWe present optical lightcurves of the gravitationally lensed components A (=A1+A2+A3) and B of the quadruple quasar RX J0911.4+0551 (z = 2.80). The observations were primarily obtained at the Nordic Optical Telescope between 1997 March and 2001 April and consist of 74 I-band data points for each component. The data allow the measurement of a time delay of 146 +- 8 days (2 sigma) between A and B, with B as the leading component. This value is significantly shorter than that predicted from simple models and indicates a very large external shear. Mass models including the main lens galaxy and the surrounding massive cluster of galaxies at z = 0.77, responsible for the external shear, yield H_0 = 71 +- 4 (random, 2 sigma) +- 8 (systematic) km/s/Mpc. The systematic model uncertainty is governed by the surface-mass density (convergence) at the location of the multiple images.
dc.description12 pages, 3 figures, ApJL, in press (June 20, 2002)
dc.identifierhttps://arxiv.org/abs/astro-ph/0205124
dc.identifierhttp://arxiv.org/abs/astro-ph/0205124
dc.identifierAstrophys.J. 572 (2002) L11-L14
dc.identifierdoi:10.1086/341603
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/4440
dc.subjectAstrophysics
dc.titleThe time delay of the quadruple quasar RX J0911.4+0551
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