Markarian 421的极端类HBL行为及其双带光强子解释
Extreme HBL-like behavior of Markarian 421 and its two-zone photohadronic interpretation
摘要：
马卡良421是最近的高能尖峰耀变体，也是第一个在多TeV $γ$射线中被探测到的河外源。它已经在多波长中观察了非常长的一段时间，并进行了密集的监测，并从该源中检测到了几次主要的爆发。2010年3月，该辐射源处于高度活跃状态，各种望远镜连续13天对它进行了多波长观测。在此期间，发现同步加速器峰的位置高于$10^{17}$ Hz，并且第二峰的位置也向更高的能量移动，这是极端HBL样行为的特征。我们观察到，标准的光强子模型是不足以解释所观察到的光谱。然而，最近提出的双区光强子模型很好地解释了MAGIC和VERITAS望远镜观测到的GeV-TeV耀斑事件。根据对MJD 55266上最高能量$γ$射线事件的观测，我们还估算了最小体洛伦兹因子。
英文摘要：
Markarian 421 is the nearest high-energy peaked blazar and also is the first extragalactic source to be detected in multi-TeV $γ$-rays. It has been observed in multiwavelength for exceptionally long period of time with dense monitoring and several major outbursts have been detected from this source. In March 2010, the source was in a high state of activity and was observed in multiwavelength by various telescopes for 13 consecutive days. During this period the position of the synchrotron peak was found to be above $10^{17}$ Hz and also the position of the second peak was shifted towards higher energy, a signature of extreme HBL-like behavior. We observed that the standard photohadronic model is inadequate to explain the observed spectra. However, a recently proposed two-zone photohadronic model explains very well the GeV-TeV flaring events observed by both MAGIC and VERITAS telescopes. From the observation of the highest energy $γ$-ray event on MJD 55266 we also estimated the minimum bulk Lorentz factor.
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