Abstract
The article presents the results of long-term photometric monitoring of two binary gravitationally lensed quasars, SDSS J2124\(+\)1632 and SDSS J0806\(+\)2006, carried out at the Maidanak Observatory in 2017–2022. The obtained light curves of the lensed components of both systems are analyzed. The variability of SDSS J2124\(+\)1632 turned out to be quite large: up to \(0\overset{\textrm{m}}{.}50\) for the system as a whole and up to \(0\overset{\textrm{m}}{.}75\) for component A. Long-term microlensing was found against the background of a general increase in the apparent brightness of the quasar source. The brightness variations in SDSS J0806\(+\)2006 are less intense: the range is about \(0\overset{\textrm{m}}{.}20\) for the system as a whole, and up to \(0\overset{\textrm{m}}{.}25\) for both components. Analysis of the light curves did not show the presence of microlensing here. We also calculated the probable values of the time delay: \(\Delta t_{\textrm{AB}}=102\pm 20\) days (component B is in the lead) and \(\Delta t_{\textrm{AB}}=-53.0\pm 6.0\) days (component A is in the lead) in SDSS J2124\(+\)1632 and SDSS J0806\(+\)2006, respectively. The value of \(\Delta t_{\textrm{AB}}\) for SDSS J2124\(+\)1632 is consistent with previously found time delays for binary gravitationally lensed systems. In the case of the second system, the time delay is consistent with earlier theoretical calculations, which suggested that the time delay should be about 50 days.
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Notes
The name is arbitrary. In NED can be found as WISE J2124+1632:[DWK2018] G.
IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation.
REFERENCES
T. A. Akhunov, S. N. Nuritdinov, A. Sergeev, and O. Burkhonov, Uzbek Journal of Physics 9, 291 (2007).
T. A. Akhunov, O. Wertz, A. Elyiv, et al., Monthly Notices Royal Astron. Soc. 465, 3607 (2017). https://doi.org/10.1093/mnras/stw2951
B. P. Artamonov, V. V. Bruevich, A. S. Gusev, et al., Astronomy Reports 54 (11), 1019 (2010). https://doi.org/10.1134/S1063772910110077
I. M. Asfandiyarov, S. A. Ehgamberdiev, M. Millon, and F. Courbin, Uzbek Journal of Physics 22 (6), 325 (2020).
J. H. H. Chan, C. Lemon, F. Courbin, et al., Astron. and Astrophys. 659, id. A140 (2022). https://doi.org/10.1051/0004-6361/202142389
S. A. Ehgamberdiev, A. K. Baijumanov, S. P. Ilyasov, et al., Astron. and Astrophys. Suppl. 145, 293 (2000). https://doi.org/10.1051/aas:2000244
E. R. Gaynullina, R. W. Schmidt, T. Akhunov, et al., Astron. and Astrophys. 440, 53 (2005). https://doi.org/10.1051/0004-6361:20052852
R. Gil-Merino, L. Wisotzki, and J. Wambsganss, Astron. and Astrophys. 381, 428 (2002). https://doi.org/10.1051/0004-6361:20011523
N. Inada, M. Oguri, R. Becker, et al., Astron. J. 131, 1934 (2006). https://doi.org/10.1086/500591
E. Koptelova, W. P. Chen, T. Chiueh, et al., Astron. and Astrophys. 544, id. A51 (2012). https://doi.org/10.1051/0004-6361/201116645
C. Lemon, T. Anguita, M. Auger, et al., arXiv e-prints astro/ph:2206.07714 (2022). https://doi.org/10.48550/arXiv.2206.07714
C. A. Lemon, M. W. Auger, and R. G. McMahon, Monthly Notices Royal Astron. Soc. 483, 4242 (2019). https://doi.org/10.1093/mnras/sty3366
C. A. Lemon, M. W. Auger, R. G. McMahon, and F. Ostrovski, Monthly Notices Royal Astron. Soc. 479, 5060 (2018). https://doi.org/10.1093/mnras/sty911
J. Pelt, R. Kayser, S. Refsdal, and T. Schramm, Astron. and Astrophys. 305, 97 (1996). https://doi.org/10.48550/arXiv.astro-ph/9501036
S. Refsdal, Monthly Notices Royal Astron. Soc. 128, 307 (1964). https://doi.org/10.1093/mnras/128.4.307
P. Schneider, J. Ehlers, and E. E. Falco, Gravitational Lenses, XIV (Springer-Verlag, Berlin, Heidelberg, New York, 1992).
D. Sluse, F. Courbin, A. Eigenbrod, and G. Meylan, Astron. and Astrophys. 492, L39 (2008). https://doi.org/10.1051/0004-6361:200810977
D. Sluse, D. Hutsemekers, F. Courbin, et al., Astron. and Astrophys. 544, id. A62 (2012). https://doi.org/10.1051/0004-6361/201219125
D. Stern, S. G. Djorgovski, A. Krone-Martins, et al., Astrophys. J. 921, 42 (2021). https://doi.org/10.3847/1538-4357/ac0f04
P. B. Stetson, L. E. Davis, and D. R. Crabtree, ASP Conf. Ser. 8, 289 (1990).
Y. A. Tillaev, A. Azimov, S. A. Ehgamberdiev, and S. Ilyasov, Atmosphere 14, 10 (2023). https://doi.org/10.3390/atmos14020199
A. Ullán, L. J. Goicoechea, A. P. Zheleznyak, et al., Astron. and Astrophys. 452, 25 (2006). https://doi.org/10.1051/0004-6361:20054283
L. Verde, T. Treu, and A. G. Riess, Nature Astronomy 3, 891 (2019). https://doi.org/10.1038/s41550-019-0902-0
N. C. Wickramasinghe, J. T. Wickramasinghe, and E. Mediavilla, Astrophys. and Space Sci. 298, 453 (2005). https://doi.org/10.1007/s10509-005-5835-7
ACKNOWLEDGMENTS
The authors express their deep gratitude to the management and staff of the Ulugh Beg Astronomical Institute (Uzbekistan) for organizing long-term observations at the Maidanak Observatory, which made it possible to obtain the results of this article.
Funding
The work was carried out within the framework of the grant FZ-20200929344, allocated by the Ministry of Higher Education, Science and Innovations of the Republic of Uzbekistan.
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Bekov, D.K., Akhunov, T.A., Burkhonov, O.A. et al. Light Curves of Lensed Components and Time Delay Measurements in the Binary Gravtationally Lensed Quasars SDSS J2124\(+\)1632 and SDSS J0806\(+\)2006. Astrophys. Bull. 79, 15–24 (2024). https://doi.org/10.1134/S1990341323600278
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DOI: https://doi.org/10.1134/S1990341323600278