Reference : An Optical Time Delay Estimate for the Double Gravitational Lens System B1600+434
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/2759
An Optical Time Delay Estimate for the Double Gravitational Lens System B1600+434
English
Burud, I. [Institut d'Astrophysique et de Géophysique de Liège, Avenue de Cointe 5, B-4000 Liège, Belgium; Present address: Institute of Astronomy and Astrophysics, Academica Sinica, P.O. Box 1-87, Nankang, Taipei 11529, Taiwan, Republic of China.; Institute of Astrophysics and Planetary Sciences, Ibarak: University, Japan.]
Hjorth, J. [Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark; Department of Physics and Research Center for the Early Universe, University of Tokyo, Hongo, Bunkyon, Tokyo 113-8654, Japan.]
Jaunsen, A. O. [Institute of Theoretical Astrophysics, University of Oslo, Pb. 1029 Blindern, N0315 Oslo, Norway; Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085; , iribas@ast.villanova.edu, fitz@ast.villanova.edu, george.mccook@villanova.edu.]
Andersen, M. I. [Division of Astronomy, University of Oulu, PO Box 3000, FIN-90014 Oulun Yliopisto, Finland; Laboratorio de Astrofísica Espacial y Física Fundamental, Apartado 50727, E-28080 Madrid, Spain; .; Instituto de Astrofísica de Andalucía, CSIC, Apartado 3004, E-18080 Granada, Spain.]
Korhonen, H. [Division of Astronomy, University of Oulu, PO Box 3000, FIN-90014 Oulun Yliopisto, Finland; Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal, 647, E-08028 Barcelona, Spain; .]
Clasen, J. W. [Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Canary Islands, Spain; Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085; , iribas@ast.villanova.edu, fitz@ast.villanova.edu, george.mccook@villanova.edu.]
Pelt, J. [Tartu Astrophysical Observatory, Tõravere, 61602, Estonia; Division of Astronomy and Astrophysics, UCLA, CA 90095-1562.; Deceased.]
Pijpers, F. P. [Theoretical Astrophysics Center, University of Aarhus, DK-8000 Århus C, Denmark; Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127, Bologna, Italy.]
Magain, Pierre mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Østensen, R. [Department of Physics, University of Tromsø, Tromsø, Norway; Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127, Bologna, Italy.; Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy.]
1-Nov-2000
Astrophysical Journal
University of Chicago Press
544
117-122
Yes (verified by ORBi)
International
0004-637X
Chicago
IL
[en] Cosmology: Observations ; Cosmology: Distance Scale ; Galaxies: Spiral ; Cosmology: Gravitational Lensing ; quasars: individual (B1600+434)
[en] 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 Maller et al., this time delay estimate yields a Hubble parameter of H[SUB]0[/SUB]=52[SUP]+14[/SUP][SUB]-8[/SUB] km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP] (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. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.
http://hdl.handle.net/2268/2759
10.1086/317213
http://adsabs.harvard.edu/abs/2000ApJ...544..117B
http://de.arxiv.org/abs/astro-ph/0007136
The authors thank IOP Science for their deposit authorization

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