论文标题
X射线腔系统的Lofar观测
LOFAR Observations of X-ray Cavity Systems
论文作者
论文摘要
我们在120-168 MHz的42个系统中提出了Lofar观测值，在其炎热大气中可能具有X射线腔，其中17个是组或椭圆形，19个是附近的簇（z <0.3），而6个是更高的降轴簇（z> 0.3）。由中央活性银河核（AGN）的无线电叶形成的X射线腔是射模AGN反馈的证据。在组和椭圆形样品中，超过一半的系统具有X射线腔，未检测到相关的叶片发射。相反，我们报告了NGC 6338中大型无线电裂片的发现，远远超出了文献中先前报道的排放。在附近的簇中，我们的观察结果表明，低频无线电发射的延伸超出了空腔（例如MS 0735.6+7421和A2052）。我们首次在2A 0335+096，ZWCL 2701和ZWCL 8276中首次报道了安全的腔体 - 拉迪奥关联，从而增强了他们作为AGN创建的腔的解释。但是，在一些已知的腔体系统（例如A1795和ZWCL 3146）中，我们报告了与腔有关的可检测到的低频无线电发射。我们的高红移系统样本很小，不幸的是，目前的Lofar观察结果无法解决许多裂片。然而，我们的样本代表了可用于研究无线电模式AGN反馈中无线电和喷气功率之间连接的最佳选择之一。
We present LOFAR observations at 120-168 MHz of 42 systems with possible X-ray cavities in their hot atmosphere, of which 17 are groups or ellipticals, 19 are nearby clusters (z<0.3), and six are higher-redshift clusters (z>0.3). The X-ray cavities, formed by the radio lobes of the central active galactic nucleus (AGN), are evidence of radio-mode AGN feedback. In the groups and ellipticals sample, more than half of the systems have X-ray cavities for which no associated lobe emission was detected. Conversely, we report the discovery of large radio lobes in NGC 6338, extending far beyond the emission reported previously in the literature. In the case of the nearby clusters, our observations show that there is little low-frequency radio emission that extends beyond the cavities (e.g., MS 0735.6+7421 and A2052). For the first time, we report secure cavity-radio associations in 2A 0335+096, ZwCl 2701, and ZwCl 8276 that strengthens their interpretation as AGN-created cavities. However, in some known cavity systems (e.g., A1795 and ZwCl 3146) we report the lack of detectable low-frequency radio emission associated with the cavities. Our sample of higher-redshift systems is small, and unfortunately the present LOFAR observations are not able to resolve the lobes in many of them. Nevertheless, our sample represents one of the best available for investigating the connection between radio and jet power in radio-mode AGN feedback.
