论文标题
光谱能量分布的曲率和$γ$ - 费米lac对象的优势
The Curvature of Spectral Energy Distribution and $γ$-ray Dominance of Fermi BL Lac Objects
论文作者
论文摘要
外乳外$γ$射线的天空主要由Blazars主导，他们的研究在理解超高能量宇宙射线的喷气物理学，宇宙进化史和起源方面起着重要作用。在这项工作中，我们研究了大量的BL LAC对象样本，以研究为什么在$γ$ -rays中检测到某些来源，而另一些则没有检测到。我们选择了170个BL LAC对象，具有测量的同步子光谱曲率和多普勒因子，并将其分为检测到的费米 - 拉特（FBLS）和未检测到的（NFBL）源。我们表明，即使摆脱了多普勒光束效果，FBL的曲率也比NFBL小。 The BL Lac objects PKS 0048-09 and S5 0716+714 have similar synchrotron peak frequency and luminosity but different $γ$-ray dominance and their quasi-simultaneous broadband spectral energy distributions (SEDs) can be well fitted by a log-parabolic synchrotron self-Compton (SSC) model with same jet parameters except for the curvature and source size, assuming curvature being与排放区域的大小成正比。我们的结果表明，对于给定的同步子发光度，不同的SED曲率和康普顿优势可能解释了FBL和NFBL之间的差异。我们在随机粒子加速度和辐射机制的背景下讨论了这些结果。
The extragalactic $γ$-ray sky is dominated by blazars and their study plays an important role in understanding jet physics, cosmic evolution history and origin of ultra high energy cosmic rays. In this work, we study a large sample of BL Lac objects to investigate why some sources are detected in $γ$-rays, while others not. We selected 170 BL Lac objects, with measured synchrotron spectral curvature and Doppler factor, and divided them into Fermi-LAT detected (FBLs) and non-detected (NFBLs) sources. We show that FBLs have smaller curvature than NFBLs, even after getting rid of Doppler beaming effect. The BL Lac objects PKS 0048-09 and S5 0716+714 have similar synchrotron peak frequency and luminosity but different $γ$-ray dominance and their quasi-simultaneous broadband spectral energy distributions (SEDs) can be well fitted by a log-parabolic synchrotron self-Compton (SSC) model with same jet parameters except for the curvature and source size, assuming curvature being proportional to the size of emission region. Our results imply that for a given synchrotron luminosity, the different SED curvature and Compton dominance may account for the discrepancy between FBLs and NFBLs. We discuss these results in context of stochastic particle acceleration and radiation mechanisms.
