MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay

MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay
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引力透镜类星体的 MiNDSTEp 差分光度测定 WFI 2033-4723 和 HE 0047-1756:微透镜和新的时间延迟

DOI:
10.1051/0004-6361/201527422
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发表时间:
2016
影响因子:
6.5
通讯作者:
Giannini E
Giannini E
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Giannini E

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目的研究引力透镜类星体WFI 2033-4723和HE 0047-1756的VandR测光。这些数据是由MiNDSTEp与ESO La Silla天文台的1.54 m丹麦望远镜合作于2008年至2012年拍摄的。方法使用HOTPAnTS软件包中实现的图像相减方法进行差分测光,另外使用GALFIT进行类星体测光。4723在VandR中显示出0.5等的亮度变化。类星体HE 0047-1756的两个透镜组件在五年内变化了0.2-0.3等。我们首次给出了该天体B分量相对于A的时间延迟Δt=(7.6 ± 1.8)天的估计。我们还发现证据的长期演变的组件A和B在两个过滤器,我们解释为由于一个长时间的微透镜事件之间的幅度差异。最后,我们发现类星体WFI 2033-4723和HE 0047-1756都是越亮越蓝,这与以前的研究结果一致。
AimsWe presentVandRphotometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756. The data were taken by the MiNDSTEp collaboration with the 1.54 m Danish telescope at the ESO La Silla observatory from 2008 to 2012.MethodsDifferential photometry has been carried out using the image subtraction method as implemented in the HOTPAnTS package, additionally using GALFIT for quasar photometry.ResultsThe quasar WFI 2033-4723 showed brightness variations of order 0.5 mag inVandRduring the campaign. The two lensed components of quasar HE 0047-1756 varied by 0.2–0.3 mag within five years. We provide, for the first time, an estimate of the time delay of component B with respect to A of Δt= (7.6 ± 1.8) days for this object. We also find evidence for a secular evolution of the magnitude difference between components A and B in both filters, which we explain as due to a long-duration microlensing event. Finally we find that both quasars WFI 2033-4723 and HE 0047-1756 become bluer when brighter, which is consistent with previous studies.
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