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arXiv 0904.4906astro-ph.HE
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软伽玛重复爆发的叠加引力波信号

Stacking Gravitational Wave Signals from Soft Gamma Repeater Bursts

P. Kalmus, K. C. Cannon, S. Marka, B. J. Owen

摘要:

软伽马中继器(SGR)具有独特的性质,使它们成为引力波(GW)搜索的有趣目标。它们就在附近,它们的爆发发射机制可能涉及中子星地壳断裂和准正常模式的激发,并且它们反复爆发,有时甚至是壮观的。最近LIGO对这些源的瞬态GW的搜索对一组近200个单独的SGR爆发设置了上限。这些限值在某些模型的理论预测范围内。我们提出了一种新的搜索策略,建立在那里使用的方法,通过“堆叠”潜在的GW信号从多个SGR突发。我们假设突发电磁发射和突发GW发射之间的时间差的变化相对于GW信号持续时间是小的,并且我们将包含单独突发触发的GW过量功率时间-频率平铺与它们对应的电磁发射时间对准。使用蒙特卡罗模拟,我们确认GW能量灵敏度的增益N^{1/2}是可能的,其中N是堆叠SGR爆发的数量。模拟搜索引力波从2006年3月29日风暴从SGR 1900+14的估计灵敏度,两个GW的排放模式,“通量加权”和“平”(未加权)。

英文摘要:

Soft gamma repeaters (SGRs) have unique properties that make them intriguing targets for gravitational wave (GW) searches. They are nearby, their burst emission mechanism may involve neutron star crust fractures and excitation of quasi-normal modes, and they burst repeatedly and sometimes spectacularly. A recent LIGO search for transient GW from these sources placed upper limits on a set of almost 200 individual SGR bursts. These limits were within the theoretically predicted range of some models. We present a new search strategy which builds upon the method used there by "stacking" potential GW signals from multiple SGR bursts. We assume that variation in the time difference between burst electromagnetic emission and burst GW emission is small relative to the GW signal duration, and we time-align GW excess power time-frequency tilings containing individual burst triggers to their corresponding electromagnetic emissions. Using Monte Carlo simulations, we confirm that gains in GW energy sensitivity of N^{1/2} are possible, where N is the number of stacked SGR bursts. Estimated sensitivities for a mock search for gravitational waves from the 2006 March 29 storm from SGR 1900+14 are also presented, for two GW emission models, "fluence-weighted" and "flat" (unweighted).

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