论文标题
中间红移的类星体并不特别。但是他们经常是卫星
Quasars at intermediate redshift are not special; but they are often satellites
论文作者
论文摘要
了解星系中心及其宿主暗物质光环的超级质量黑洞（SMBH）的活动之间的联系是现代天体物理学的一个关键问题。 SDSS-IV EBOSS的最终数据发布提供了最大的当代星系和QSO样品。使用此样品并覆盖红移间隔$ z = 0.7-1.1 $，我们测量了Eboss QSOS，发射线星系（ELGS）和发光红色星系（LRGS）的聚类特性。我们还测量了QSO的比例，这是星系群体定义的过度密度的函数。使用这些测量值，我们研究了QSO如何填充和采样星系群体，以及QSOS的宿主暗物haloe如何采样基础光环分布。我们发现，托管QSO的星系的概率与星系的宿主暗物质光环质量无关。我们还发现，大约60％的eBoss QSO由LRG托管，约20-40％的QSO由卫星星系托管。我们发现QSO略微偏爱填充卫星星系，而不是中央星系。这连接到不同类型星系的宿主光环质量分布。基于我们的分析，QSO应通过光环的分布非常广泛，并且它们的发生应仅通过星系形成过程的效率来调节。
Understanding the links between the activity of supermassive black holes (SMBH) at the centres of galaxies and their host dark matter haloes is a key question in modern astrophysics. The final data release of the SDSS-IV eBOSS provides the largest contemporary spectroscopic sample of galaxies and QSOs. Using this sample and covering the redshift interval $z=0.7-1.1$, we have measured the clustering properties of the eBOSS QSOs, Emission Line Galaxies (ELGs) and Luminous Red Galaxies (LRGs). We have also measured the fraction of QSOs as a function of the overdensity defined by the galaxy population. Using these measurements, we investigate how QSOs populate and sample the galaxy population, and how the host dark-matter haloes of QSOs sample the underlying halo distribution. We find that the probability of a galaxy hosting a QSO is independent of the host dark matter halo mass of the galaxy. We also find that about 60\% of eBOSS QSOs are hosted by LRGs and about 20-40\% of QSOs are hosted by satellite galaxies. We find a slight preference for QSOs to populate satellite galaxies over central galaxies. This is connected to the host halo mass distribution of different types of galaxies. Based on our analysis, QSOs should be hosted by a very broad distribution of haloes, and their occurrence should be modulated only by the efficiency of galaxy formation processes.
