First estimate of the time delay in HE 1104-1805
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First estimate of the time delay in HE 1104-1805. / Wisotzki, Lutz; Wucknitz, Olaf; Lopez, Sebastian; Sørensen, Anton Norup.
I: Astronomy and Astrophysics, Bind 339, Nr. 3, 20.11.1998, s. L73-L76.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - First estimate of the time delay in HE 1104-1805
AU - Wisotzki, Lutz
AU - Wucknitz, Olaf
AU - Lopez, Sebastian
AU - Sørensen, Anton Norup
PY - 1998/11/20
Y1 - 1998/11/20
N2 - 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.
AB - 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.
KW - Gravitational lensing
KW - Quasars: general
KW - Quasars: individual: HE 1104-1805
UR - http://www.scopus.com/inward/record.url?scp=0002750813&partnerID=8YFLogxK
M3 - Journal article
AN - SCOPUS:0002750813
VL - 339
SP - L73-L76
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
IS - 3
ER -
ID: 235848675