• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >THE CAVITY OF CYGNUS A
【24h】

THE CAVITY OF CYGNUS A

机译：天鹅座的腔

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this Letter, we focus on the limb-brightened, prolate spheroidal cavity of the radio galaxy Cygnus A, as revealed by the Chandra X-Ray Observatory. We use the shock-heated, thermal intracluster medium around the expanding cavity to infer the properties of the radio synchrotron-emitting gas inside the cavity. The gas along the north and south edges of the cavity is found to have an average temperature of 6.0 keV, which is hotter than the temperature (4.6 keV) of the adjacent intracluster gas. It is proposed that this hotter gas is intracluster gas shocked by the expanding cavity. The shock is thus inferred to be weak (Mach number 1.3, a value also inferred from the density jump at the cavity edge), and its velocity is 1460 km s~(-1). The total kinetic power of the expansion is found to be 1.2 x 10~(46) ergs s~(-1), which is somewhat larger than both the total radio power and the power emitted by the entire intracluster medium in the 2-10 keV band. It appears that most of the power of the jets in Cygnus A is currently going into heating the intracluster medium. From the derived pressure inside the cavity, there is no conclusive evidence for a component contributing pressure additional to the magnetic fields and relativistic particles responsible for the synchrotron radio emission. Furthermore, the ratio of energy densities in positive to negative cosmic rays in Cygnus A is between 1 and 100 (the latter being the value in our Galaxy).
机译：在这封信中，我们重点介绍了钱德拉X射线天文台揭示的射电星系天鹅座A的四肢明亮的长球形球腔。我们使用膨胀腔周围的冲击加热的热团簇内介质来推断腔内发射无线电同步加速器的气体的特性。发现沿着腔体的北边缘和南边缘的气体的平均温度为6.0 keV，比相邻的簇内气体的温度（4.6 keV）高。提出该较热的气体是由膨胀腔冲击的团簇内气体。因此，推断出该冲击是微弱的（马赫数为1.3，也由空腔边缘处的密度跳跃推导出来的值），并且其速度为1460 km s〜（-1）。发现膨胀的总动能为1.2 x 10〜（46）ergs s〜（-1），这比2-10中的总无线电功率和整个集群内介质发出的功率都稍大keV带。看来，天鹅座A中的大多数射流功率正在用来加热集群内介质。从腔内的推导压力来看，没有确凿的证据表明一种成分会给磁场和相对论粒子带来额外的压力，而这些成分是造成同步加速器无线电发射的原因。此外，天鹅座A中正负宇宙射线的能量密度之比在1到100之间（后者是我们银河系中的值）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号