星系光浓度与X射线光通量比的反相关
On the Anticorrelation Between Galaxy Light Concentration and X-ray-to-Optical Flux Ratio
摘要：
活动星系核（AGN）在现代宇宙学的许多方面起着重要的作用，特别是活动星系核与其宿主星系之间的相互作用问题。利用X射线和光学数据，我们在Subaru/XMM-Newton Deep Survey（SXDS）观测场中观测了大量活动星系核的性质，并研究了它们与宿主星系演化的关系。本文首次发现了星系光密度（C）与X射线-光通量比（X/O）之间的关系，这一关系可能表明，早期型星系由于缺乏活动星系核活动的物质供应，其爱丁顿率低于晚期型星系。
英文摘要：
Active Galactic Nuclei (AGN) play an important role in many aspects of the modern cosmology, and of particular interest is the issue of the interplay between AGN and their host galaxy. Using X-ray and optical data sets, we have explored the properties of a large sample of AGNs in the Subaru/XMM-Newton Deep Survey (SXDS) field, and studied their evolution in relation with the evolution of their host galaxy. We present here an anticorrelation between X-ray-to-optical flux ratio (X/O) and galaxy light concentration (C), which has been found for the first time and might suggest that early type galaxies, having poor matter supply to feed the AGN activity, have lower Eddington rates than those of late type galaxies.
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