Light Curves of Lensed Components and Time Delay Measurements in the Binary Gravtationally Lensed Quasars SDSS J2124 $$+$$ 1632 and SDSS J0806 $$+$$ 2006

IF 1.3 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysical Bulletin Pub Date : 2024-05-08 DOI:10.1134/s1990341323600278

D. Kh. Bekov, T. A. Akhunov, O. A. Burkhonov, N. R. Alimova

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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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双引力凝聚类星体 SDSS J2124 $+$$$ 1632 和 SDSS J0806 $+$$ 2006 中凝聚成分的光变曲线和时间延迟测量结果

摘要文章介绍了2017-2022年在迈达纳克天文台对两颗双引力透镜类星--SDSS J2124$+$1632 和 SDSS J0806$+$2006 --进行长期光度监测的结果。对所获得的这两个系统透镜组件的光变曲线进行了分析。结果发现SDSS J2124$+$1632 的变率相当大：整个系统高达$0\overset{\textrm{m}}{.}50$，A部分高达$0\overset{\textrm{m}}{.}75$。SDSS J0806$+$2006 的亮度变化并不那么强烈：整个系统的变化范围大约是 $0\overset{\textrm{m}}{.}20$，而两个部分的变化范围则高达 $0\overset{\textrm{m}}{.}25$。对光曲线的分析表明，这里并不存在微透镜现象。我们还计算了时间延迟的可能值：\在SDSS J2124$+$1632 和SDSS J0806$+$2006 中，我们还分别计算了可能的时间延迟值：（\Delta t_{textrm{AB}}=102\pm 20\ ）天（B成分处于领先地位）和（\Delta t_{textrm{AB}}=-53.0\pm 6.0\ ）天（A成分处于领先地位）。SDSS J2124$+$1632 的$\Delta t_{textrm{AB}}$值与之前发现的双引力透镜系统的时间延迟一致。在第二个系统的情况下，时间延迟与早先的理论计算是一致的，后者认为时间延迟应该是大约50天。

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来源期刊

Astrophysical Bulletin 地学天文-天文与天体物理

CiteScore

2.00

自引率

33.30%

发文量

审稿时长

>12 weeks

期刊介绍： Astrophysical Bulletin is an international peer reviewed journal that publishes the results of original research in various areas of modern astronomy and astrophysics, including observational and theoretical astrophysics, physics of the Sun, radio astronomy, stellar astronomy, extragalactic astronomy, cosmology, and astronomy methods and instrumentation.