2017MNRAS.465.3607A -
Mon. Not. R. Astron. Soc., 465, 3607-3621 (2017/March-1)
Adaptive PSF fitting - a highly performing photometric method and light curves of the GLS H1413+117: time delays and micro-lensing effects.
AKHUNOV T.A., WERTZ O., ELYIV A., GAISIN R., ARTAMONOV B.P., DUDINOV V.N., NURITDINOV S.N., DELVAUX C., SERGEYEV A.V., GUSEV A.S., BRUEVICH V.V., BURKHONOV O., ZHELEZNYAK A.P., EZHKOVA O. and SURDEJ J.
Abstract (from CDS):
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 χ2 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: ΔtAB = -17.4 ± 2.1, ΔtAC = -18.9 ± 2.8 and ΔtAD = 28.8 ± 0.7 d using the χ2 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 ∼10–4 mag/d during all the seasons, while the D component shows an unusually strong micro-lensing effect with variations of up to ∼10–3 mag/d during 2004 and 2005.
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Journal keyword(s):
gravitational lensing: strong - gravitational lensing: micro - methods: data analysis - techniques: photometric: individual: H1413+117 - techniques: photometric: individual: H1413+117
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