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arXiv 0904.4394astro-ph.HE
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寻找软γ中继站的引力波爆发

Search for Gravitational Wave Bursts from Soft Gamma Repeaters

Peter Kalmus

摘要:

我们提出的结果,LIGO搜索短持续时间的引力波(GW)与软伽玛中继(SGR)爆发。这是第一次对中子星f模式敏感的GW搜索,通常被认为是最有效的GW发射模式。我们没有发现任何与SGR爆发相关的GWs的证据,在由2004年12月27日SGR 1806 - 20的巨大耀斑和190个较小的事件组成的样本中,SGR 1806- 20和SGR 1900+14发生在LIGO第五次科学运行的第一年。GW应变上限和模型依赖的GW发射能量上限估计使用各种模拟波形的个人突发。我们发现,依赖于模型的各向同性GW发射能量(在标称距离为10 kpc处)的上限估计值在3x10^45和9x10^52尔格之间,这取决于爆发时的波形类型、探测器天线因子和噪声特性。这些上限在某些SGR模型的理论预测范围内。我们还提出了一种新的方法,它扩展了初始SGR突发搜索,探索SGR源发射类似的GW从突发到突发的可能性,通过“堆叠”潜在的GW信号。我们表明,GW的能量灵敏度N^{1/2}的增益是可能的,其中N是堆叠SGR爆发的数量。估计敏感性的模拟搜索GWs从2006年3月29日风暴SGR 1900+14的两个叠加方案:一个“通量加权”的情况下,“平”(未加权)的情况下。最后,我们提出了一种通过光子激励器校准引力波探测器的方法。光子校准器的标称2-sigma置信误差条目前估计约为3%。他们对官方校准进行了有价值的检查,发现了一些可能被忽视的问题。

英文摘要:

We present the results of a LIGO search for short-duration gravitational waves (GW) associated with soft gamma repeater (SGR) bursts. This is the first GW search sensitive to neutron star f-modes, usually considered the most efficient GW emitting modes. We find no evidence of GWs associated with any SGR burst in a sample consisting of the 2004 December 27 giant flare from SGR 1806-20 and 190 lesser events from SGR 1806-20 and SGR 1900+14 which occurred during the first year of LIGO's fifth science run. GW strain upper limits and model-dependent GW emission energy upper limits are estimated for individual bursts using a variety of simulated waveforms. We find upper limit estimates on the model-dependent isotropic GW emission energies (at a nominal distance of 10 kpc) between 3x10^45 and 9x10^52 erg depending on waveform type, detector antenna factors and noise characteristics at the time of the burst. These upper limits are within the theoretically predicted range of some SGR models. We also propose a new method which extends the initial SGR burst search, exploring the possibility that SGR sources emit similarly in GWs from burst to burst by "stacking" potential GW signals. We show 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 GWs from the 2006 March 29 storm from SGR 1900+14 are presented for two stacking scenarios: a "fluence-weighted" scenario and a "flat" (unweighted) scenario. Finally, we present a method for calibrating gravitational wave detectors via photon actuators. The photon calibrators' nominal 2-sigma confidence error bars are currently estimated to be ~3%. They have provided a valuable check on the official calibration, uncovering problems that may otherwise have gone unnoticed.

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