C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET23:52:36

2002A&A...381..428G - Astronomy and Astrophysics, volume 381, 428-439 (2002/1-2)

The Double Quasar HE 1104-1805: A case study for time delay determination with poorly sampled lightcurves.


Abstract (from CDS):

We present a new determination of the time delay of the gravitational lens system HE 1104-1805 (``Double Hamburger'') based on a previously unpublished dataset. We argue that the previously published value of ΔtA–B=0.73 years was affected by a bias of the employed method. We determine a new value of ΔtA–B=0.85±0.05 years (2σ confidence level), using six different techniques based on non interpolation methods in the time domain. The result demonstrates that even in the case of poorly sampled lightcurves, useful information can be obtained with regard to the time delay. The error estimates were calculated through Monte Carlo simulations. With two already existing models for the lens and using its recently determined redshift, we infer a range of values of the Hubble parameter: H0=48±4km/s/Mpc (2σ) for a singular isothermal ellipsoid (SIE) and H0=62±4km/s/Mpc (2σ) for a constant mass-to-light ratio plus shear model (M/L+γ). The possibly much larger errors due to systematic uncertainties in modeling the lens potential are not included in this error estimate.

Abstract Copyright:

Journal keyword(s): gravitational lensing - time delays - quasars: individual: HE 1104-1805 - general: data analysis

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 8C 0958+561 QSO 10 01 20.6915852239 +55 53 55.595776916   17.16 16.95     ~ 703 3
2 QSO B1104-181 QSO 11 06 33.39 -18 21 23.8   15.8 15.9 15.7   ~ 307 1

    Equat.    Gal    SGal    Ecl

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