An Optical Time-Delay for the Lensed BAL Quasar HE2149-2745

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dc.creatorBurud, I.
dc.creatorCourbin, F.
dc.creatorMagain, P.
dc.creatorLidman, C.
dc.creatorHutsemekers, D.
dc.creatorKneib, J. -P.
dc.creatorHjorth, J.
dc.creatorBrewer, J.
dc.creatorPompei, E.
dc.creatorGermany, L.
dc.creatorPritchard, J.
dc.creatorJaunsen, A. O.
dc.creatorLetawe, G.
dc.creatorMeylan, G.
dc.date2001-12-10
dc.date.accessioned2026-07-07T12:00:48Z
dc.date.available2026-07-07T12:00:48Z
dc.descriptionWe present optical V and i-band light curves of the gravitationally lensed BAL quasar HE2149-2745. The data, obtained with the 1.5m Danish Telescope (ESO-La Silla) between October 1998 and December 2000, are the first from a long-term project aimed at monitoring selected lensed quasars in the Southern Hemisphere. A time delay of 103+/-12 days is determined from the light curves. In addition, VLT/FORS1 spectra of HE2149-2745 are deconvolved in order to obtain the spectrum of the faint lensing galaxy, free of any contamination by the bright nearby two quasar images. By cross-correlating the spectrum with galaxy-templates we obtain a tentative redshift estimate of z=0.495+/-0.01. Adopting this redshift, a Omega=0.3, Lambda=0.7 cosmology, and a chosen analytical lens model, our time-delay measurement yields a Hubble constant of H_0=66+/-8 km/s/Mpc with an estimated systematic error of +/-3 km/s/Mpc. Using non-parametric models yields H_0=65+/-8 km/s/Mpc and confirms that the lens exhibits a very dense/concentrated mass profile.
dc.description11 pages, accepted for publication in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/0112225
dc.identifierhttp://arxiv.org/abs/astro-ph/0112225
dc.identifierAstron.Astrophys.383:71-81,2002
dc.identifierdoi:10.1051/0004-6361:20011731
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206903
dc.subjectAstrophysics
dc.titleAn Optical Time-Delay for the Lensed BAL Quasar HE2149-2745
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