Flux and color variations of the doubly imaged quasar UM673

Flux and color variations of the doubly imaged quasar UM673
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双成像类星体 UM673 的通量和颜色变化

DOI:
10.1051/0004-6361/201118755
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发表时间:
2013
影响因子:
6.5
通讯作者:
Ricci D
Ricci D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ricci D

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AimsWith的目的是特征的通量和颜色变化的多个组件的引力透镜类星体UM 673作为时间的函数,我们已经进行了多历元和多波段光度观测与丹麦望远镜在La Silla Observatory.MethodsThe observations were carried out in theVRispectral bands during four seasons(2008-2011)。我们减少了数据,使用点扩散函数光度技术以及光圈photometry.ResultsOur的结果表明,最明亮的透镜组件的一些显着减少的前两个赛季之间的流量(+ 0.09/+ 0.11/+ 0.05等)和随后的增加在以下的(-0.11/-0.11/-0.10等)在theV/R/ispectral带,分别。将我们的结果与以前的研究相比,我们发现这些季节之间的颜色变化较小。我们还分离的透镜星系的贡献,从较暗的和关闭的透镜组件。
AimsWith the aim of characterizing the flux and color variations of the multiple components of the gravitationally lensed quasar UM673 as a function of time, we have performed multiepoch and multiband photometric observations with the Danish telescope at the La Silla Observatory.MethodsThe observations were carried out in theVRispectral bands during four seasons (2008–2011). We reduced the data using the point spread function photometric technique as well as aperture photometry.ResultsOur results show for the brightest lensed component some significant decrease in flux between the first two seasons (+ 0.09/+ 0.11/+ 0.05 mag) and a subsequent increase during the following ones (− 0.11/− 0.11/− 0.10 mag) in theV/R/ispectral bands, respectively. Comparing our results with previous studies, we find smaller color variations between these seasons as compared with previous ones. We also separate the contribution of the lensing galaxy from that of the fainter and close lensed component.
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