2006年SGR 1900+14风暴引力波的叠加搜索
Stacked Search for Gravitational Waves from the 2006 SGR 1900+14 Storm
摘要：
我们提出了一个LIGO搜索的结果与2006年3月29日SGR 1900+14风暴的短持续时间的引力波（GWs）。使用了一种新的搜索方法，在风暴中单个软伽马爆发的时间周围“堆叠"GW数据，以提高模型的灵敏度，其中多个爆发伴随着GW发射。我们假设突发电磁发射和潜在突发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器的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。我们使用两个GW发射模型在我们的搜索：一个通量加权模型和一个平面（未加权）模型的最电磁能量的爆发。我们没有发现任何证据的GWs与这两种模式。使用各种假设波形估计模型相关GW应变、各向同性GW发射能量E_GW和γ= E_GW / E_EM上限。叠加方法使我们能够设置最严格的模型依赖的限制，到目前为止发表的瞬态GW应变。我们发现，根据波形类型，E_GW上限估计值（标称距离为10 kpc）在2x10^45 erg和6x10^50 erg之间。这些极限比先前公布的这场风暴的上限低一个数量级，并与SGR巨型耀斑发射的电磁能量范围重叠。
英文摘要：
We present the results of a LIGO search for short-duration gravitational waves (GWs) associated with the 2006 March 29 SGR 1900+14 storm. A new search method is used, "stacking'' the GW data around the times of individual soft-gamma bursts in the storm to enhance sensitivity for models in which multiple bursts are accompanied by GW emission. We assume that variation in the time difference between burst electromagnetic emission and potential 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. We use two GW emission models in our search: a fluence-weighted model and a flat (unweighted) model for the most electromagnetically energetic bursts. We find no evidence of GWs associated with either model. Model-dependent GW strain, isotropic GW emission energy E_GW, and γ= E_GW / E_EM upper limits are estimated using a variety of assumed waveforms. The stacking method allows us to set the most stringent model-dependent limits on transient GW strain published to date. We find E_GW upper limit estimates (at a nominal distance of 10 kpc) of between 2x10^45 erg and 6x10^50 erg depending on waveform type. These limits are an order of magnitude lower than upper limits published previously for this storm and overlap with the range of electromagnetic energies emitted in SGR giant flares.
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