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arXiv 1910.09528astro-ph.HEastro-ph.IMgr-qc
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用不同的探测器响应探测引力波:两个新的双黑洞合并

Detecting Gravitational Waves With Disparate Detector Responses: Two New Binary Black Hole Mergers

Barak Zackay, Liang Dai, Tejaswi Venumadhav, Javier Roulet, Matias Zaldarriaga

摘要:

我们介绍了一种新的技术来寻找引力波事件从紧凑的二进制合并,产生一个明确的信号,只有在一个单一的引力波检测器,和边缘信号在其他检测器。当网络中的探测器具有不同的灵敏度时,或者当源具有不利的天空位置或方向时,可能会出现这种情况。我们从一个简短的列表开始,这些列表来自参数空间的区域,这些区域在经验上不受毛刺的影响(在应用信号质量否决之后)。对于这些触发器中的每一个,我们通过相干地结合来自所有检测器的可能性并在外部几何参数上边缘化来计算来自检测器网络的其余部分的天体物理起源的证据。我们报告了在Advanced LIGO和Virgo(O2)的第二次观测运行中发现的两个新的二元黑洞(BBH)合并,除了Abbott et al.(2018)和Venumadhav et al.(2019)报道的那些。我们估计,这两个事件的误报率分别为19年(60 O2)和11年(36 O2)。其中一个事件GW 170817 A在源帧中具有原发和继发质量$m_1^{\rm src} = 56_{-10}^{+16} \, M_\odot$和$m_2^{\rm src} = 40_{-11}^{+10} \, M_\odot$。GW 170817 A的存在应该是非常有用的关于恒星质量黑洞的理论预测的上质量间隙。它的有效自旋参数被测量为$χ_{\rm eff} = 0.5 \pm 0.2$,这是符合的趋势,较重的检测到的BBH系统具有大的和积极的有效自旋参数。另一个事件,GWC 170402,将在今后的工作中彻底讨论。

英文摘要:

We introduce a new technique to search for gravitational wave events from compact binary mergers that produce a clear signal only in a single gravitational wave detector, and marginal signals in other detectors. Such a situation can arise when the detectors in a network have different sensitivities, or when sources have unfavorable sky locations or orientations. We start with a short list of loud single-detector triggers from regions of parameter space that are empirically unaffected by glitches (after applying signal-quality vetoes). For each of these triggers, we compute evidence for astrophysical origin from the rest of the detector network by coherently combining the likelihoods from all detectors and marginalizing over extrinsic geometric parameters. We report the discovery of two new binary black hole (BBH) mergers in the second observing run of Advanced LIGO and Virgo (O2), in addition to the ones that were reported in Abbott et al. (2018) and Venumadhav et al. (2019). We estimate that the two events have false alarm rates of one in 19 years (60 O2) and one in 11 years (36 O2). One of the events, GW170817A, has primary and secondary masses $m_1^{\rm src} = 56_{-10}^{+16} \, M_\odot$ and $m_2^{\rm src} = 40_{-11}^{+10} \, M_\odot$ in the source frame. The existence of GW170817A should be very informative about the theoretically predicted upper mass gap for stellar mass black holes. Its effective spin parameter is measured to be $χ_{\rm eff} = 0.5 \pm 0.2$, which is consistent with the tendency of the heavier detected BBH systems to have large and positive effective spin parameters. The other event, GWC170402, will be discussed thoroughly in future work.

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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