论文标题
TXS 1433+205：最远的伽马射线发射FR II射电射线银河系
TXS 1433+205: The most distant gamma-ray emitting FR II radio galaxy
论文作者
论文摘要
射流轴对观察者的视线的方向在解释从大麻和射电星系中观察到的现象中起着重要作用。在伽马射线带中，仅确定了少数射电星系，它们都位于附近的宇宙中（z <0.5）。在这里，我们报告了与TXS 1433+205相关的4FGL J1435.5+2021的鉴定，作为Fanaroff-Riley II型（FR II）射线星系，在Z = 0.748的红移中，它使其成为最遥远的伽马射线射线射线，从而使其最遥远地检测到了现在已知的射电宽银河。 3 GHz的非常大的阵列天空调查数据将源形态分解为明亮的核心，一个喷气机和两个热点，端到端的总长度在叶左右左右约170 kpc之间。该神秘对象的光学和无线电特性表明它是一个高激发的FR II射频银河系。发现TXS 1433+205的多波长行为类似于其他检测到的FR II源，但处于高光度端。我们建议，持续的和即将进行的高分辨率无线电调查将导致在伽马射线天空中鉴定出更多的高红移射线星系，从而允许对未对准的相对论喷射的全面研究。
The orientation of the jet axis to the line of sight of the observer plays a major role in explaining the phenomena observed from blazars and radio galaxies. In the gamma-ray band, only a handful of radio galaxies have been identified, all being located in the nearby Universe (z<0.5). Here we report the identification of 4FGL J1435.5+2021, associated with TXS 1433+205, as a Fanaroff-Riley type II (FR II) radio galaxy at a considerably higher redshift of z=0.748, thereby making it the most distant gamma-ray detected radio galaxy known as of now. The Very Large Array Sky Survey data at 3 GHz resolves the source morphology into a bright core, a jet and two hotspots, with a total end-to-end projected length between lobe extremities of ~170 kpc. The optical and radio properties of this enigmatic object suggest it to be a high-excitation FR II radio galaxy. The multi-wavelength behaviour of TXS 1433+205 is found to be similar to other gamma-ray detected FR II sources but is at the high luminosity end. We suggest that the ongoing and upcoming high-resolution radio surveys will lead to the identification of many more high-redshift radio galaxies in the gamma-ray sky, thus allowing comprehensive studies of misaligned relativistic jets.
