Title: IGR J17488-2338: a newly discovered giant radio galaxy Show Chinese title

Title: IGR J17488-2338：一个新发现的巨型射电星系

Abstract: We present the discovery of a large scale radio structure associated with IGR J17488--2338, a source recently discovered by \emph{INTEGRAL} and optically identified as a broad line AGN at redshift 0.24. At low frequencies, the source properties are those of an intermediate-power FR II radio galaxy with a linear size of 1.4\,Mpc. This new active galaxy is therefore a member of a class of objects called Giant Radio Galaxies (GRGs), a rare type of radio galaxies with physical sizes larger than 0.7\,Mpc; they represent the largest and most energetic single entities in the Universe and are useful laboratories for many astrophysical studies. Their large scale structures could be due either to special external conditions or to uncommon internal properties of the source central engine The AGN at the centre of IGR J17488--2338 has a black hole of 1.3$\times$10$^9$ solar masses, a bolometric luminosity of 7$\times$10$^{46}$erg\,s$^{-1}$ and an Eddington ratio of 0.3, suggesting that it is powerful enough to produce the large structure observed in radio. The source is remarkable also for other properties, among which its X-ray absorption, at odds with its type 1 classification, and the presence of a strong iron line which is a feature not often observed in radio galaxies. Show Chinese abstract

Abstract: 我们发现了与IGR J17488--2338相关的大型尺度射电结构，该源最近由\emph{积分}发现，并在光学上被识别为红移0.24的宽线AGN。在低频下，该源的特性是中等功率的FR II射电星系，线性尺寸为1.4 Mpc。因此，这个新的活动星系是被称为巨型射电星系（GRGs）的天体类别的一员，这是一种物理尺寸大于0.7 Mpc的罕见射电星系；它们是宇宙中最大和最活跃的单一实体，并且是许多天体物理研究的有用实验室。它们的大尺度结构可能是由于特殊的外部条件或源中心引擎的不寻常内部特性。IGR J17488--2338中心的AGN有一个质量为1.3$\times$10$^9$太阳质量的黑洞，总辐射光度为7$\times$10$^{46}$erg s$^{-1}$，以及爱丁顿比率0.3，表明它足够强大以产生在射电中观测到的大结构。该源还有其他显著特性，其中包括其X射线吸收情况与其类型1分类相矛盾，以及存在一个强铁线，这是射电星系中不常观察到的特征。