论文标题
瞬态HBL Blazar 4FGL J1544.3-0649的奇怪情况
The strange case of the transient HBL blazar 4FGL J1544.3-0649
论文作者
论文摘要
我们提出了一项关于瞬态$γ$ -Ray源4FGL J1544.3-0649的多频研究，这是一种从X-Ray和$γ$ -Ray Sky中的匿名中强度无线电源，从未发现的匿名中强度无线电源的状态，表现出了出色的行为。我们的分析表明，平均$γ$ -Ray频谱由PowerLaw很好地描述，其光子指数为$ 1.87 \ pm0.04 $，而高于100 meV的通量为$（8.0 \ pM0.9）\ times10^{ - 9}}}}}来源的主动状态。 X射线通量和光谱斜率都高度可变，最高的2-10 KEV通量达到$（1.28 \ PM0.05）\ times10^{ - 10} \：{\ rm erg \ \：cm^{ - cm^{ - 2}} \ \：s^{ - 1}} $。在几个观察结果中，X射线频谱将其硬化到该点，这意味着SED峰移至大于10 keV的能量。就像在许多极端的大麻中一样，宽带光谱能量分布可以通过均质的单区同步符号 - 富含compton Leptonic模型来描述。如果4FGL J1544.3-0649所显示的双重行为并不代表孤立的情况，而是对高能多通间的天体物理学的潜在影响，而是如此遥不可及的相对常见现象的表现。
We present a multifrequency study of the transient $γ$-ray source 4FGL J1544.3-0649, a blazar that exhibited a remarkable behaviour raising from the state of an anonymous mid-intensity radio source, never detected at high energies, to that of one of the brightest extreme blazars in the X-ray and $γ$-ray sky. Our analysis shows that the averaged $γ$-ray spectrum is well described by a powerlaw with a photon index of $1.87\pm0.04$, while the flux above 100 MeV is $(8.0\pm0.9)\times10^{-9}\:{\rm photon\: cm^{-2}\: s^{-1}}$, which increases during the active state of the source. The X-ray flux and spectral slope are both highly variable, with the highest 2-10 keV flux reaching $(1.28\pm0.05)\times10^{-10}\:{\rm erg\:cm^{-2}\:s^{-1}}$. On several observations the X-ray spectrum hardened to the point implying as SED peak moving to energies larger than 10 keV. As in many extreme blazars the broadband spectral energy distribution can be described by a homogeneous one-zone synchrotron-self-Compton leptonic model. We briefly discuss the potential implications for high-energy multi-messenger astrophysics in case the dual behaviour shown by 4FGL J1544.3-0649 does not represent an isolated case, but rather a manifestation of a so far unnoticed relatively common phenomenon.
