CHANG-ES. XXX. 墨西哥草帽星系中的 10 kpc 射电瓣
CHANG-ES. XXX. 10 kpc Radio Lobes in The Sombrero Galaxy
AI总结:
利用CHANG-ES项目数据,发现墨西哥草帽星系中尺度达10 kpc的射电瓣,证实瓣内磁压与周围热压在1-10 kpc范围内平衡,并指出AGN喷流反馈可能解释该星系异常高的X射线光度。
摘要:
我们利用来自近邻星系连续晕——扩展甚大阵列(VLA)巡天(CHANG-ES)项目的数据,报告了在墨西哥草帽星系(NGC 4594)中发现尺度为 10 千秒差距(kpc)的射电瓣。我们进一步检验了瓣内磁压与周围热气体热压之间的平衡。在半径 $r$ 约为 (1-10) kpc 范围内,瓣内磁压与周围热气体的热压总体上处于平衡状态。这意味着喷流能够向周围环境膨胀,至少达到 r ~ 10 kpc。由负责形成这些大尺度瓣的活动星系核(AGN)喷流所产生的反馈,可能有助于解释这颗大质量宁静孤立盘星系异常高的 X 射线光度,尽管仍需更多理论工作来进一步检验这种可能性。
英文摘要:
We report the discovery of the 10 kilo-parsec (kpc) scale radio lobes in the Sombrero galaxy (NGC 4594), using data from the Continuum Halos in Nearby Galaxies - an Expanded Very Large Array (VLA) Survey (CHANG-ES) project. We further examine the balance between the magnetic pressure inside the lobes and the thermal pressure of the ambient hot gas. At the radii $r$ of ~(1-10) kpc, the magnetic pressure inside the lobes and the thermal pressure of the ambient hot gas are generally in balance. This implies that the jets could expand into the surroundings at least to r ~ 10 kpc. The feedback from the active galactic nucleus (AGN) jet responsible for the large-scale lobes may help to explain the unusually high X-ray luminosity of this massive quiescent isolated disk galaxy, although more theoretical work is needed to further examine this possibility.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。