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arXiv 1409.2600astro-ph.HE
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aLIGO/Virgo触发的轴上短伽马射线暴光学余辉的探测效率

The detection efficiency of on-axis short gamma ray burst optical afterglows triggered by aLIGO/Virgo

David Coward, Marica Branchesi, Eric Howell, Paul Lasky, Michel Boer

摘要:

假设中子星(NS)或中子星/恒星质量黑洞(BH)合并为祖先的短伽马射线暴,我们推导并证明了一个简单的分析工具,用于模拟恢复轴上光学余辉的效率由高级LIGO和Virgo网络检测到的候选引力波事件触发。利用观测到的伽马射线暴,对不同类型的工作望远镜的符合探测效率进行了评估。我们展示了效率如何依赖于光学余辉的光度分布,望远镜的功能,和天空定位的引力波触发。我们估计了一个合理的光学余辉和引力波符合率为1年$^{-1}$(0.1年$^{-1}$)的NS-NS(NS-BH),以及如何按比例缩小探测效率的时间,它需要图像的引力波天空定位和望远镜的极限星等。对于NS-NS(NS-BH),我们发现当总成像时间小于200 min(80 min)且极限幅度小于20时,$>80%$的检测效率最大(21)。我们表明,相对较小的望远镜$(m<18)$可以实现类似的检测效率米级设施$(m<20)$具有类似的视野,只有当不太敏感的仪器可以响应触发器并在10- 15分钟。将LIGO印度纳入引力波天文台网络将大大减少具有有限星等$\sim20$但具有中等视场的望远镜的成像时间。风景一个最佳的符合搜索需要一个全球网络的敏感和快速响应的广域仪器,可以有效地成像相对较大的引力波天空定位,并产生进一步的光度和光谱后续的瞬态候选人。

英文摘要:

Assuming neutron star (NS) or neutron star/stellar-mass black hole (BH) mergers as progenitors of the short gamma ray bursts, we derive and demonstrate a simple analysis tool for modelling the efficiency of recovering on-axis optical afterglows triggered by a candidate gravitational wave event detected by the Advanced LIGO and Virgo network. The coincident detection efficiency has been evaluated for different classes of operating telescopes using observations of gamma ray bursts. We show how the efficiency depends on the luminosity distribution of the optical afterglows, the telescope features, and the sky localisation of gravitational wave triggers. We estimate a plausible optical afterglow and gravitational wave coincidence rate of 1 yr$^{-1}$ (0.1 yr$^{-1}$) for NS-NS (NS-BH), and how this rate is scaled down in detection efficiency by the time it takes to image the gravitational wave sky localization and the limiting magnitude of the telescopes. For NS-NS (NS-BH) we find maximum detection efficiencies of $>80%$ when the total imaging time is less than 200 min (80 min) and the limiting magnitude fainter than 20 (21). We show that relatively small telescopes $(m<18)$ can achieve similar detection efficiencies to meter class facilities $(m<20)$ with similar fields of view, only if the less sensitive instruments can respond to the trigger and image the field within 10-15 min. The inclusion of LIGO India into the gravitational wave observatory network will significantly reduce imaging time for telescopes with limiting magnitudes $\sim20$ but with modest fields of view. An optimal coincidence search requires a global network of sensitive and fast response wide field instruments that could effectively image relatively large gravitational-wave sky localisations and produce transient candidates for further photometric and spectroscopic follow-up.

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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