论文标题
宇宙黎明处的第一个伽马射线发射bl lacertae对象
The First Gamma-ray Emitting BL Lacertae Object at the Cosmic Dawn
论文作者
论文摘要
研究相对论喷气机的宇宙演变的主要挑战之一是鉴定高红移（$ z> 3 $）bl lacertae对象，这是一类以Quasi-Featureless Optical Spartra为特征的喷射活跃的银河系核。在这里，我们报告了第一个$γ$ -RARE的BL LAC对象的识别，即4FGL〜J1219.0+3653（J1219），超过$ z = 3 $，即在宇宙年龄的前两年内。从10.4 m Gran Telescopio Canarias采集的J1219的光学和近红外光谱没有发射线，低至$ \ sim $ 3.5 $ 3.5 a支撑其Bl lac自然。另一方面，在$ \ sim $ 5570 A中检测出强的lyman-$α$中断，证实J2119确实是高红移（$ z \ sim3.59 $）Quasar。基于最近BL LAC演化模型的预测，J1219是仅在$ z = 3.5 $的同时卷中预期存在的两个此类对象之一。因此，未来的$ z> 3 $γ$ ray-ray发射bl lac来源的未来识别对于验证其宇宙进化的理论至关重要。
One of the major challenges in studying the cosmic evolution of relativistic jets is the identification of the high-redshift ($z>3$) BL Lacertae objects, a class of jetted active galactic nuclei characterized by their quasi-featureless optical spectra. Here we report the identification of the first $γ$-ray emitting BL Lac object, 4FGL~J1219.0+3653 (J1219), beyond $z=3$, i.e., within the first two billion years of the age of the Universe. The optical and near-infrared spectra of J1219 taken from 10.4 m Gran Telescopio Canarias exhibit no emission lines down to an equivalent width of $\sim$3.5 A supporting its BL Lac nature. The detection of a strong Lyman-$α$ break at $\sim$5570 A, on the other hand, confirms that J2119 is indeed a high-redshift ($z\sim3.59$) quasar. Based on the prediction of a recent BL Lac evolution model, J1219 is one of the only two such objects expected to be present within the comoving volume at $z=3.5$. Future identifications of more $z>3$ $γ$-ray emitting BL Lac sources, therefore, will be crucial to verify the theories of their cosmic evolution.
