[en] We present new photometric observations of H1413+117 acquired during seasons between 2001 and 2008 in order to estimate the time delays between the lensed quasar images and to characterize at best the on-going micro-lensing events. We propose a highly performing photometric method called the adaptive point spread function fitting and have successfully tested this method on a large number of simulated frames. This has enabled us to estimate the photometric error bars affecting our observational results. We analysed the V- and R-band light curves and V-R colour variations of the A-D components which show short- and long-term brightness variations correlated with colour variations. Using the χ[SUP]2[/SUP] and dispersion methods, we estimated the time delays on the basis of the R-band light curves over the seasons between 2003 and 2006. We have derived the new values: Δt[SUB]AB[/SUB] = -17.4 ± 2.1, Δt[SUB]AC[/SUB] = -18.9 ± 2.8 and Δt[SUB]AD[/SUB] = 28.8 ± 0.7 d using the χ[SUP]2[/SUP] method (B and C are leading, D is trailing) with 1σ confidence intervals. We also used available observational constraints (resp. the lensed image positions, the flux ratios in mid-IR and two sets of time delays derived in the present work) to update the lens redshift estimation. We obtained z_l = 1.95^{+0.06}_{-0.10} which is in good agreement with previous estimations. We propose to characterize two kinds of micro-lensing events: micro-lensing for the A, B, C components corresponds to typical variations of ∼10[SUP]-4[/SUP] mag d[SUP]-1[/SUP] during all the seasons, while the D component shows an unusually strong micro-lensing effect with variations of up to ∼10[SUP]-3[/SUP] mag d[SUP]-1[/SUP] during 2004 and 2005.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Akhunov, Talat ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Wertz, O.; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 19c, Sart Tilman, B-4000 Liège, Belgium
Elyiv, A.; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 19c, Sart Tilman, B-4000 Liège, Belgium ; Main Astronomical Observatory, Academy of Sciences of Ukraine, 27 Akademika Zabolotnoho St., UA-03680 Kyiv, Ukraine ; Dipartimento di Fisica e Astronomia, Universitá di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy
Gaisin, R.; Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Astronomicheskaya 33, 100052 Tashkent, Uzbekistan
Artamonov, B. P.; Sternberg Astronomical Institute (SAI), Lomonosov Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia
Dudinov, V. N.; Institute of Radio Astronomy, Krasnoznamennaya 4, UA-61002 Kharkov, Ukraine ; Institute of Astronomy of Kharkov National University, Sumskaya 35, UA-61022 Kharkov, Ukraine
Nuritdinov, S. N.; National University of Uzbekistan, Physics Faculty, Department of Astronomy and Atmospheric Physics, 100174 Tashkent, Uzbekistan
Delvaux, Cédric ; Institut d’Astrophysique et de G ́ eophysique, Universit ́ edeLi ` ege, All ́ ee du 6 Ao ˆ ut, 19c, Sart Tilman, B-4000 Li ` ege, Belgium > 9 Max-Planck-Institut f ̈ ur extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany
Sergeyev, A. V.; Institute of Radio Astronomy, Krasnoznamennaya 4, UA-61002 Kharkov, Ukraine ; Institute of Astronomy of Kharkov National University, Sumskaya 35, UA-61022 Kharkov, Ukraine
Gusev, A. S.; Sternberg Astronomical Institute (SAI), Lomonosov Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia
Bruevich, V. V.; Sternberg Astronomical Institute (SAI), Lomonosov Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia
Burkhonov, O.; Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Astronomicheskaya 33, 100052 Tashkent, Uzbekistan
Zheleznyak, A. P.; Institute of Radio Astronomy, Krasnoznamennaya 4, UA-61002 Kharkov, Ukraine ; Institute of Astronomy of Kharkov National University, Sumskaya 35, UA-61022 Kharkov, Ukraine
Ezhkova, O.; Sternberg Astronomical Institute (SAI), Lomonosov Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
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