2007年9月至10月，AGILE探测到blazar S5 0716+714的可变gamma-ray活性
AGILE detection of variable gamma-ray activity from the blazar S5 0716+714 in September-October 2007
摘要：
我们报告的伽马射线活动从中间BL Lac S5 0716+714在观测期间获得的AGILE卫星在2007年9月和10月。这些活动的检测是同期的强烈的光学活动，这是监测GASP-WEBT的一段时间。这种同时的光学和伽马射线覆盖范围使我们能够详细研究不同活动状态期间的光变曲线，时间滞后，伽马射线光子光谱和光谱能量分布（SED）。AGILE用它的两个共同对准的成像仪，伽马射线成像探测器（GRID）和硬X射线成像仪（Super-AGILE），分别对30 MeV-50 GeV和18-60 keV的能量范围敏感。观测在两个不同的时期完成，第一个在2007年9月4日至23日之间，第二个在2007年10月24日至11月1日之间。在2007年9月7日至12日期间，AGILE探测到来自源的伽马射线发射，其显著性水平为9.6西格玛，平均通量（E>100 MeV）为（97 +/- 15）x 10^{-8}光子cm^{-2} s^{-1}，在三天内增加了至少四倍。对于能量范围18-60 keV至335 ksec内10 mCrab的3-sigma上限，Super-AGILE未检测到发射。2007年10月，AGILE在一次强烈的光学耀斑之后重新指向S5 0716+714，测量到平均通量为（47 +/- 11）x 10^{-8}光子cm^{-2} s^{-1}，显著性水平为6.0 sigma。AGILE探测到的S5 0716+714的伽马射线通量是有史以来探测到的最高的耀变体，也是从BL Lac天体探测到的最强烈的伽马射线通量之一。9月中旬的SED似乎是一致的同步自康普顿（SSC）的排放模型，但只有包括两个不同的变量SSC组件。
英文摘要：
We report the gamma-ray activity from the intermediate BL Lac S5 0716+714 during observations acquired by the AGILE satellite in September and October 2007. These detections of activity were contemporaneous with a period of intense optical activity, which was monitored by GASP-WEBT. This simultaneous optical and gamma-ray coverage allows us to study in detail the light curves, time lags, gamma-ray photon spectrum, and Spectral Energy Distributions (SEDs) during different states of activity. AGILE observed the source with its two co-aligned imagers, the Gamma-Ray Imaging Detector (GRID) and the hard X-ray imager (Super-AGILE), which are sensitive to the 30 MeV-50 GeV and 18-60 keV energy ranges, respectively. Observations were completed in two different periods, the first between 2007 September 4-23, and the second between 2007 October 24-November 1. Over the period 2007 September 7-12, AGILE detected gamma-ray emission from the source at a significance level of 9.6-sigma with an average flux (E>100 MeV) of (97 +/- 15) x 10^{-8} photons cm^{-2} s^{-1}, which increased by a factor of at least four within three days. No emission was detected by Super-AGILE for the energy range 18-60 keV to a 3-sigma upper limit of 10 mCrab in 335 ksec. In October 2007, AGILE repointed toward S5 0716+714 following an intense optical flare, measuring an average flux of (47 +/- 11) x 10^{-8} photons cm^{-2} s^{-1} at a significance level of 6.0-sigma. The gamma-ray flux of S5 0716+714 detected by AGILE is the highest ever detected for this blazar and one of the most intense gamma-ray fluxes detected from a BL Lac object. The SED of mid-September appears to be consistent with the synchrotron self-Compton (SSC) emission model, but only by including two SSC components of different variabilities.
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