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arXiv 1802.01692astro-ph.IM
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VST的引力波光学跟踪

Gravitational Waves optical follow-up at VST

A. Grado, E. Brocato, M. Branchesi, E. Cappellaro, S. Covino, M. Della Valle, F. Getman, G. Greco, L. Limatola, G. Stratta, S. Yang

摘要:

我们报告的深度光学后续调查的前两个引力波事件,GW150914和GW151226,完成了引力波Inaf TeAm合作(GRAWITA)使用VLT巡天望远镜(VST)。我们迅速响应了LIGO和Virgo合作组织发出的引力波警报,分别覆盖了GW150914和GW151226的$90$ deg $^2$和$72$ deg $^2$的区域,并在近两个月的时间里持续观察这两个区域。两次巡天都达到了$r-$波段的平均极限星等约21等。本文概述了VST的观测策略和两个独立的程序开发搜索瞬态对应候选人在多历元VST图像。许多瞬变现象已经被发现,主要是变星和食双星,但没有发现与引力波事件有关的候选者。所做的工作让我们获得经验,并为下一次LVC运行调整工具,并在一般情况下利用广域光学调查和未来多信使计划(包括Theseus等项目)之间的协同作用。

英文摘要:

We report on the deep optical follow-up surveys of the first two gravitational-wave events, GW150914 and GW151226, accomplished by the GRAvitational Wave Inaf TeAm Collaboration (GRAWITA) using the VLT Survey Telescope (VST). We responded promptly to the gravitational-wave alerts sent by the LIGO and Virgo Collaborations, covering a region of $90$ deg$^2$ and $72$ deg$^2$ for GW150914 and GW151226, respectively, and kept observing the two areas over nearly two months. Both surveys reached an average limiting magnitude of about 21 in the $r-$band. The paper outlines the VST observational strategy and two independent procedures developed to search for transient counterpart candidates in multi-epoch VST images. Numerous transients have been discovered, mostly variable stars and eclipsing binaries, but no candidates are identified as related to the gravitational-wave events. The work done let on to gain experience and tune the tools for next LVC runs and in general to exploit the synergies between wide field optical surveys and future multi-messenger programs including projects like Theseus.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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