1998A&A...339L..73W


Query : 1998A&A...339L..73W

1998A&A...339L..73W - Astronomy and Astrophysics, volume 339, L73-76 (1998/11-3)

First estimate of the time delay in HE 1104-1805.

WISOTZKI L., WUCKNITZ O., LOPEZ S. and SORENSEN A.N.

Abstract (from CDS):

We present first results from five years of spectrophotometric monitoring of the bright double QSO and gravitational lens HE 1104-1805. The quasar has varied considerably over this time, while the emission line fluxes appear to have remained constant. We have constructed monochromatic continuum light curves for components A and B, finding that B leads the variability. A quantitative analysis with the Pelt method gives a best estimate for the light travel time delay of about 0.73 years, although a value as low as 0.3 cannot yet be excluded. We discuss possible models for the QSO-lens configuration and use our measured time delay to predict the redshift of the lens, zd. Finding that most likely zd≲1, we can rule out the hitherto favoured values of zd=1.32 or 1.66. A new candidate is an absorption system at z=0.73, but the lens could also be an elliptical not detected in absorption.

Abstract Copyright:

Journal keyword(s): quasars: individual: HE 1104-1805 - quasars: general - gravitational lensing

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [WKK93] G G 11 06 33.3 -18 21 23           ~ 35 1
2 QSO B1104-181 QSO 11 06 33.3845199936 -18 21 23.829049296   15.8 15.9 15.7   ~ 312 1
3 [BDW2002] q1104-1805a LeQ 11 06 33.50 -18 21 24.0     16.8     ~ 47 0
4 [BDW2002] q1104-1805b LeQ 11 06 33.60 -18 21 26.0     18.8     ~ 43 0

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2022.05.22-09:01:15

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