Localization of Compact Binary Sources with Second-generation Gravitational-wave Interferometer Networks
Localization of Compact Binary Sources with Second-generation Gravitational-wave Interferometer Networks
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DOI：
10.3847/1538-4357/abb373
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
C. Pankow;M. Rizzo;K. Rao;Christopher P. L. Berry;V. Kalogera
中科院分区：
文献类型：
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作者：
C. Pankow;M. Rizzo;K. Rao;Christopher P. L. Berry;V. Kalogera
GW 170817开始了引力波多信使天文学。然而，GW 170817在未来几年将不能代表探测，因为典型的引力波源将更接近探测视界，具有更大的定位区域，并且（当存在时）将具有相应的较弱的电磁辐射。在其设计状态下，2020年代中期的引力波探测器网络将由多达五个类似灵敏度的第二代干涉仪组成。整个网络的瞬时天空覆盖几乎是各向同性的，与前三次观测运行期间的配置相反。沿着天空的覆盖范围，对于一个给定的双星质量，平均视界也有相应的增加。我们提出了一组现实的中子星联星和中子星-黑洞联星的局部化，结合了网络内占空比和对天体物理分布的选择效应。基于80%占空比的假设，并且两个仪器观察到高于检测阈值的信号，我们预计中值为28 sq。°的中子星的双星，和50-120平方英尺。°的中子星黑洞（取决于假设的人口）。这些分布范围很广，即使对于仪器较少的网络，最好的本地化也将具有1-10平方米的本地化。°的范围完整的五仪器网络将局部化区域减少到最坏的几十度。
GW170817 began gravitational-wave multimessenger astronomy. However, GW170817 will not be representative of detections in the coming years because typical gravitational-wave sources will be closer the detection horizon, have larger localization regions, and (when present) will have correspondingly weaker electromagnetic emission. In its design state, the gravitational-wave detector network in the mid-2020s will consist of up to five similar-sensitivity second-generation interferometers. The instantaneous sky-coverage by the full network is nearly isotropic, in contrast to the configuration during the first three observing runs. Along with the coverage of the sky, there are also commensurate increases in the average horizon for a given binary mass. We present a realistic set of localizations for binary neutron stars and neutron star–black hole binaries, incorporating intra-network duty cycles and selection effects on the astrophysical distributions. Based on the assumption of an 80% duty cycle, and that two instruments observe a signal above the detection threshold, we anticipate a median of 28 sq. deg. for binary neutron stars, and 50–120 sq. deg. for neutron star–black hole (depending on the population assumed). These distributions have a wide spread, and the best localizations, even for networks with fewer instruments, will have localizations of 1–10 sq. deg. range. The full five instrument network reduces localization regions to a few tens of degrees at worst.