Impact of noise transients on low latency gravitational-wave event localization
Impact of noise transients on low latency gravitational-wave event localization
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DOI：
10.1103/physrevd.105.103021
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发表时间：
2022-02
影响因子：
5
通讯作者：
R. Macas;Joshua Pooley;L. Nuttall;D. Davis;M. Dyer;Y. Lecoeuche;J. Lyman;J. McIver;K. Rink-K.-Rin
中科院分区：
文献类型：
--
作者：
R. Macas;Joshua Pooley;L. Nuttall;D. Davis;M. Dyer;Y. Lecoeuche;J. Lyman;J. McIver;K. Rink-K.-Rin
引力波（GW）数据包含称为“毛刺”的非高斯噪声瞬态。在第三次LIGO-Virgo观测运行期间，所有引力波候选者中约有24%处于故障附近，而由于探测器灵敏度的提高，未来的观测运行可能会影响更多的事件。这带来了一个问题，因为毛刺可能会影响GW源参数的估计，包括天空定位，这对识别电磁（EM）对应物至关重要。在本文中，我们提出了一项研究，估计有多少天空定位是受附近的小故障在低延迟。我们将双星黑洞（BBH）、双星中子星星（BNS）和中子星-黑洞（NSBH）信号注入到包含三种不同类型的毛刺：光点、雷暴和快速散射的数据中。这些小故障的影响是通过估计望远镜需要搜索的瓦片点的数量来评估的，直到观察到事件的真实天空位置。我们发现，blip小故障影响的BBH合并的本地化最;在最极端的情况下，BBH事件是完全错过了，即使是20度的视场（FOV）的望远镜。雷暴故障对BBH和NSBH事件的影响最大，特别是在没有第三个干涉仪的情况下，而BNS事件似乎不受影响。快速散射毛刺仅对NSBH信号影响低延迟定位。对于双干涉仪网络，小（FOV=1 deg$^2$）和大（FOV=20 deg$^2$）望远镜受到影响，而三干涉仪定位偏差足够小，不会影响大（FOV=20 deg$^2$）望远镜。
Gravitational-wave (GW) data contains non-Gaussian noise transients called"glitches". During the third LIGO-Virgo observing run about 24% of all gravitational-wave candidates were in the vicinity of a glitch, while even more events could be affected in future observing runs due to increasing detector sensitivity. This poses a problem since glitches can affect the estimation of GW source parameters, including sky localisation, which is crucial to identify an electromagnetic (EM) counterpart. In this paper we present a study that estimates how much sky localisation is affected by a nearby glitch in low latency. We injected binary black hole (BBH), binary neutron star (BNS) and neutron star-black hole (NSBH) signals into data containing three different classes of glitches: blips, thunderstorms and fast scatterings. The impact of these glitches was assessed by estimating the number of tile pointings that a telescope would need to search over until the true sky location of an event is observed. We found that blip glitches affect the localisation of BBH mergers the most; in the most extreme cases a BBH event is completely missed even by a 20 deg$^2$ field-of-view (FOV) telescope. Thunderstorm glitches have the biggest impact on BBH and NSBH events, especially if there is no third interferometer, while BNS events appear to be not affected. Fast scattering glitches impact low latency localisation only for NSBH signals. For two-interferometer network small (FOV=1 deg$^2$) and large (FOV=20 deg$^2$) telescopes are affected, whereas three-interferometer localisation bias is small enough not to affect large (FOV=20 deg$^2$) telescopes.