Статья

The Time Delay of the Quadruple Quasar RX J0911.4+0551

Jens HjorthAstronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, DenmarkIngunn BurudInstitut d’Astrophysique et de Géophysique de Liège, Avenue de Cointe 5, 4000 Liège, BelgiumAndreas O. JaunsenEuropean Southern Observatory, Casilla 19001, Santiago 19, ChilePaul L. SchechterDepartment of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139Jean-Paul KneibObservatoire Midi-Pyrénées, 14 avenue Edouard Belin, F-31400 Toulouse, FranceMichael I. AndersenDivision of Astronomy, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, FinlandHeidi KorhonenDivision of Astronomy, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, FinlandJacob W. ClasenNordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Canary Islands, SpainA. Amanda KaasNordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Canary Islands, SpainRoy ØstensenIsaac Newton Group of Telescopes, E-38700 Santa Cruz de La Palma, Canary Islands, SpainJaan PeltTartu Observatory, Tõravere 61602, EstoniaFrank P. Pijpers

2002en

ABI

Аннотация

We 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.

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Идентификаторы

DOI: 10.1086/341603

Цитирования и источники

Цитирований: 2Использованных источников: 0

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