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
中科院分区:
文献类型:
--
作者:
Giannini E
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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The Astronomical Journal
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