论文标题
硬X射线选定的巨型射电星系-II。重新启动活动的形态学证据
Hard X-ray selected giant radio galaxies -- II. Morphological evidence of restarted radio activity
论文作者
论文摘要
大约6％的射电星系（RG）可以达到大于0.7 MPC的线性尺寸，然后被归类为巨型射电星系（GRG）。使这种大结构形成的可能条件仍然不清楚 - 核心积聚性能或环境因素。最近的研究表明，在选择的硬X射线（即，从Integral/Ibis和Swift/BAT> 20 keV）中，GRG最多可以更丰富。此外，正如测得的射流和裂片功率之间的差异所暗示的那样，就核心X射线光度所期望的差异所表明的，很大一部分的年轻无线电来源表明，最近重新启动的活动是从测得的射流和裂片功率之间的差异所暗示的。在这里，我们介绍了15种硬X射线选定的GRG样本的无线电形态研究，讨论了我们的GMRT活动中的低频图像，与文献中的其他人相辅相成：其中7/15显示了以双重/X形形式重新启动无线电活动的证据，或者作为双重/X形形式的形式，或者是作为cocoon递送的最新Jets的cocoon sysission smiss smiss smissed hists shiped hists shiped hists shiped histed More Jets More Jets。这与该样品的对象一起已经发现了他们的核心托管年轻的无线电源，这表明在这些硬X射线选定的GRG中，至少有15个在15个中显示了与重新启动无线电活动的可能性一致的特征。
About 6% of Radio Galaxies (RG) can reach linear sizes larger than 0.7 Mpc, and are then classified as Giant Radio Galaxies (GRG). The conditions that make possible the formation of such big structures is still not clear - either core accretion properties or environmental factors. Recent studies have shown that GRG can be up to four times more abundant in hard X-ray selected (i.e. from INTEGRAL/IBIS and Swift/BAT at >20 keV) RG samples. Moreover, a high fraction of young radio sources found in their cores suggests a recently restarted activity, as suggested from the discrepancy between the measured jet and lobes power, with respect to the one expected from core X-ray luminosity. Here we present a radio morphological study of a sample of 15 hard X-ray selected GRG, discussing low-frequency images from our GMRT campaign complemented with others from the literature: among them, 7/15 show evidence of restarted radio activity either in the form of double-double/X-shaped morphology, or as a cocoon emission embedding more recent jets. This, together with the objects from this sample already found hosting a young radio source in their core, suggests that at least 13 over 15 of these hard X-ray selected GRG show features which are consistent with the possibility of restarted radio activity.
