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The gravitational wave 'probability event horizon' for double neutron star mergers

机译:双中子星合并的引力波“概率事件视界”

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摘要

Gravitational waves generated by the final merger of double neutron star (DNS) binary systems are a key target for the gravitational wave (GW) interferometric detectors, such as LIGO, and the next generation detectors, Advanced LIGO. The cumulative GW signal from DNS mergers in interferometric data will manifest as "geometrical noise": a non-continuous stochastic background with a unique statistical signature dominated by the spatial and temporal distribution of the sources. Because geometrical noise is highly non-Gaussian, it could potentially be used to identify the presence of a stochastic GW background from DNS mergers. We demonstrate this by fitting to a simulated distribution of transients using a model for the DNS merger rate and idealized Gaussian detector noise. Using the cosmological "probability event horizon" concept and recent bounds for the Galactic DNS merger rate, we calculate the evolution of the detectability of DNS mergers with observation time. For Advanced LIGO sensitivities and a detection threshold assuming optimal filtering, there is a 95% probability that a minimum of one DNS merger signal will be detectable from the ensemble of events comprising the stochastic background during 12-211 days of observation. For initial LIGO sensitivities, we identify an interesting regime where there is a 95% probability that at least one DNS merger with signal-to-noise ratio > unity will occur during 4-68 days of observation. We propose that there exists an intermediate detection regime with pre-filtered signal-noise-ratio less than unity, where the DNS merger rate is high enough that the geometrical signature could be identified in interferometer data.
机译:由双中子星(DNS)双星系统最终合并产生的引力波是引力波(GW)干涉式探测器(例如LIGO)和下一代探测器(高级LIGO)的主要目标。来自DNS合并的干涉数据中累积的GW信号将显示为“几何噪声”:具有唯一统计特征的非连续随机背景,其特征是源的时空分布。由于几何噪声是高度非高斯噪声,因此它有可能被用于从DNS合并中识别随机GW背景的存在。我们通过使用DNS合并率和理想化的高斯检测器噪声模型拟合瞬态的模拟分布来证明这一点。使用宇宙学的“概率事件视界”概念和银河DNS合并率的最新范围,我们计算了DNS合并的可检测性随观察时间的演变。对于高级LIGO灵敏度和假设最佳过滤的检测阈值,在观察的12-211天期间,从包含随机背景的事件集合中至少有一个DNS合并信号可检测的可能性为95%。对于最初的LIGO敏感性,我们确定了一个有趣的机制,在95%的概率下,至少有一个DNS合并将在4-68天的观察期间发生,信噪比> 1。我们建议存在一个中间检测机制,该机制具有预先过滤后的信噪比小于1的中间检测方案,其中DNS合并率足够高,可以在干涉仪数据中识别出几何特征。

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