Reference : Adaptive PSF fitting - a highly performing photometric method and light curves of the...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/218219
Adaptive PSF fitting - a highly performing photometric method and light curves of the GLS H1413+117: time delays and micro-lensing effects
English
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 mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
1-Mar-2017
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
465
3607-3621
Yes (verified by ORBi)
International
0035-8711
1365-2966
Oxford
United Kingdom
[en] gravitational lensing: strong ; gravitational lensing: micro ; methods: data analysis ; techniques: photometric: individual: H1413+117
[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.
Researchers ; Professionals
http://hdl.handle.net/2268/218219
10.1093/mnras/stw2951
http://esoads.eso.org/abs/2017MNRAS.465.3607A

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