Relic radio 'bubbles' and cluster cooling flows
Relic radio 'bubbles' and cluster cooling flows
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遗迹无线电“气泡”和集群冷却流
DOI：
10.1046/j.1365-8711.2003.06719.x
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发表时间：
2003
影响因子：
4.8
通讯作者：
D. Young
中科院分区：
文献类型：
--
作者：
D. Young
当考虑到簇内磁场的影响时，最近关于簇内介质（ICM）中的浮力射电发射腔可以引起冷却流的显著再加热的建议被重新检验。腔体的膨胀在腔体周围的ICM中产生切向场，该场可以抑制混合ICM和射电源的不稳定性。出现不稳定可以推迟10∼8年,随后的湍流级联和计算表明,ICM的实际加热可能会延迟10∼5 x 8年。这些结果可以解释为什么遗物无线电蛀牙仍作为完整的实体有时≥10 8年,从收音机和延迟注入能量源到ICM可能意味着无线电来源的角色重新加热冷却流应该被重新审查。此外，残存的射电腔的存在也可能意味着射电源叶的粒子含量主要是电子和质子，而不是电子和正电子。
Recent suggestions that buoyant radio emitting cavities in the intracluster medium (ICM) can cause significant reheating of cooling flows are re-examined when the effects of the intracluster magnetic field are included. Expansion of the cavity creates a tangential field in the ICM surrounding the cavity, and this field can suppress instabilities that mix the ICM and the radio source. Onset of instability can be delayed for ∼10 8 yr, and calculation of the subsequent turbulent cascade shows that actual reheating of the ICM may be delayed for up to ∼5 x 10 8 yr. These results may explain why the relic radio cavities remain as intact entities at times ≥10 8 yr, and the delay in injection of energy from the radio source into the ICM may mean that the role of radio sources in reheating cooling flows should be re-examined. In addition, the existence of relic radio cavities may also imply that the particle content of radio source lobes is primarily electrons and protons rather than electrons and positrons.