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Property studies of 'loner' flares of gamma-ray blazars

机译：“孤独”伽玛射线布拉泽耀斑的财产研究

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摘要

We search through gamma-ray data obtained with the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope and find 24 blazars (or candidates) that have a single clear flare event in their 9.5 yr long-term light curves. We define these events as loner flares since each flare stands out significantly above the relatively stable, low-flux light curve. We analyze the LAT data in detail for these 24 sources. The flares in 10 of them are primarily due to a single sharp peak, for which we study by fitting with two different analytic functions. The time durations thus determined for the sharp peaks are in a range of 4-25 d. The gamma-ray spectra of the 24 blazar sources can be described with a power-law or a log-parabola function. We obtain their spectral properties in the flaring and quiescent states, and find that in the flares 16 of the sources have harder emission, three have softer emission, and the other five keep the same emission. We discuss a possible correlation between the differences in photon index in the quiescent and flaring states and photon indices in quiescence. In addition, the sharp peak flares seem to have a tendency of having long time durations and hard emission, possibly related to their physical origin in a blazar jet. Studies of more similar flares will help establish these possible features.
机译：我们搜索使用大面积望远镜（LAT）的Gamma射线数据（LAT）在Fermi Gamma-ray Space望远镜上，找到24个Blazars（或候选人），在其9.5 YR长期光线曲线上有一个清晰的闪光事件。我们将这些事件定义为孤独的耀斑，因为每个火炬显着高于相对稳定的低通量光曲线。我们详细介绍了LAT数据，对这些24个来源进行详细。其中10中的耀斑主要是由于单个尖峰，我们通过用两种不同的分析功能来研究。所确定的尖峰峰的时间持续时间在4-25d的范围内。可以用动力法或对抛物线函数描述24布拉扎尔源的伽马射线光谱。我们在燃烧和静止状态中获得光谱性质，并发现在源极16的耀斑16中具有更硬的发射，三个具有更软的发射，另外五个保持相同的发射。我们讨论了静态和辐射状态和光子指数中的光子指数的差异与静态中的光子指标之间的可能相关性。此外，尖峰耀斑似乎具有长时间持续和硬排放的趋势，可能与其在布拉加尔射流中的物理起源相关。更多类似耀斑的研究将有助于建立这些可能的功能。

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