A search for giant flares from soft gamma-ray repeaters in nearby galaxies in the Konus-WIND short burst sample
A search for giant flares from soft gamma-ray repeaters in nearby galaxies in the Konus-WIND short burst sample
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在 Konus-WIND 短爆发样本中寻找附近星系中软伽马射线中继器的巨大耀斑
DOI：
10.1093/mnras/stu2436
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发表时间：
2014
影响因子：
4.8
通讯作者：
D. Frederiks
中科院分区：
文献类型：
--
作者：
D. Svinkin;K. Hurley;R. Aptekar';S. Golenetskii;D. Frederiks
软γ射线中继（SGR）巨耀斑的速率对于理解巨耀斑机制和磁星模型框架下SGR能量收支具有重要意义。我们估计的上限率使用广泛的搜索结果河外软伽马中继器巨型耀斑（GFs）之间检测到的140个短伽马射线暴在1994年和2010年之间的Konus-Wind使用星际网络（IPN）的本地化和时间参数。我们表明，Konus-Wind和IPN能够检测到能量为2.3× 1046 erg的GF（这是来自SGR 1806 20的GF的能量，假设距离为15 kpc），距离可达30 Mpc，能量为。10 45 erg（这是SGR 0526 66的GF的能量），距离高达6 Mpc。使用1896个邻近星系的样本，我们发现只有两个爆发，GRB 051103和GRB 070201，有一个IPN本地化和邻近星系之间的机会符合概率低。在注量大于5×10 7 erg cm 2的短伽玛暴中，GFs所占比例的上限为< 8%（95%置信水平）。假设邻近星系中活跃SGR的数量与其核心坍缩超新星的发生率成正比，我们推导出与SGR 180620的GF能量输出相似的GF发生率的单侧95%上限为（0.6-1.2）× 104Q1.546yr-1/SGR，其中Q46为GF在1046 erg的能量输出。
The knowledge of the rate of soft gamma-ray repeater (SGR) giant flares is important for understanding the giant flare mechanism and the SGR energy budget in the framework of the magnetar model. We estimate the upper limit to the rate using the results of an extensive search for extragalactic soft gamma-repeater giant flares (GFs) among 140 short gamma-ray bursts detected between 1994 and 2010 by Konus-Wind using InterPlanetary Network (IPN) localizations and temporal parameters. We show that Konus-Wind and the IPN are capable of detecting GFs with energies of 2.3×10 46 erg (which is the energy of the GF from SGR 1806 20 assuming a distance of 15 kpc) at distances of up to � 30 Mpc and GFs with energies of . 10 45 erg (which is the energy of the GF from SGR 0526 66) at distances of up to � 6 Mpc. Using a sample of 1896 nearby galaxies we found that only two bursts, GRB 051103 and GRB 070201, have a low chance coincidence probability between an IPN localization and a nearby galaxy. We found the upper limit to the fraction of GFs among short GRBs with fluence above � 5×10 7 erg cm 2 to be < 8% (95% confidence level). Assuming that the number of active SGRs in nearby galaxies is proportional to their core-collapse supernova rate, we derived the one-sided 95% upper limit to the rate of GFs with energy output similar to the GF from SGR 1806 20 to be (0.6–1.2) × 10 4 Q 1.5 46 yr 1 per SGR, where Q46 is the GF energy output in 10 46 erg.