揭示KAT-7的不寻常结构-发现巨型射电星系PDKEEPAAA $-$ 1302
Revealing the Unusual Structure of the KAT-7-Discovered Giant Radio Galaxy J0133$-$1302
摘要：
我们提出了一个新的研究的1.7兆秒差距的KAT-7发现的巨型射电星系，J0133 $-$ 1302，这是进行使用GMRT数据在323和608 MHz。这个源位于RA $01^h33^m13^s$和Dec $-13^{\circ}03^\prime00^{\prime\prime}$，光度红移为$\sim$ 0.3。我们发现不寻常的形态特性的来源，其中包括叶是非常不对称的，其中上叶是更远的核心相比，下叶，和一个复杂的结构的上叶。上叶的这种复杂结构暗示了另一个源的存在，它靠近叶的边缘，类似于一个双折射或扭曲的弯曲尾巴（DBT）射电星系。上叶和下叶都有一个陡峭的光谱，下叶的同步辐射年龄应该小于4400万年。核心有一个倒置的光谱，我们的结果表明，在J0133 $-$ 1302的母星系开始了新的喷流活动。我们的光谱分析表明，这个源可能是千兆赫兹峰谱（GPS）射电星系。
英文摘要：
We present a new study of the 1.7 Mpc KAT-7-discovered giant radio galaxy, J0133$-$1302, which was carried out using GMRT data at 323 and 608 MHz. This source is located at RA $01^h33^m13^s$ and Dec $-13^{\circ}03^\prime00^{\prime\prime}$ and has a photometric redshift of $\sim$0.3. We discovered unusual morphological properties of the source which include lobes that are exceptionally asymmetric, where the upper lobe is much further from the core when compared to the lower lobe, and a complex structure of the upper lobe. This complex structure of the upper lobe hints at the presence of another source, in close proximity to the edge of the lobe, which resembles a bent-double, or distorted bent tail (DBT) radio galaxy. Both the upper lobe and the lower lobe have a steep spectrum, and the synchrotron age of the lower lobe should be less than about 44 Myr. The core has an inverted spectrum, and our results suggest that the parent galaxy in J0133$-$1302 is starting a new jet activity. Our spectral analysis indicates that this source could be a GigaHertz Peaked Spectrum (GPS) radio galaxy.
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