论文标题
Subaru Hyper Suprime-CAM视图Z <1的类星体宿主星系
Subaru Hyper Suprime-Cam View of Quasar Host Galaxies at z < 1
论文作者
论文摘要
活性银河核（AGNS）是了解星系和超质量黑洞（SMBHS）的共同进化的关键。 AGN活性被认为会通过称为“ AGN反馈”的过程影响其宿主星系的性质，该过程驱动了共同进化。从Sloan数字天空调查类星体目录中的1151 Z <1型1类品牌的父样本中，我们在Subaru Hyper Suprime-CAM（HSC）调查的高质量Grizy图像中检测到了其中862个的宿主星系。调查区域和深度的前所未有的组合使我们能够对类星体星系进行统计分析，并具有较小的样品方差。我们将每个类星体的径向图像曲线作为点扩散函数和性能功能的线性组合，将图像分解为类星体核和宿主星系组件。我们发现，宿主星系是巨大的，恒星质量MSTAR> 10^（10），主要位于绿色山谷。这种趋势与AGN反馈抑制宿主星系的恒星形成的情况是一致的，也就是说，AGN活性可能是这些星系从蓝色云到红色序列的过渡。我们还研究了SMBH质量与Z <1类品牌的恒星质量关系，并发现与局部关系保持一致的斜率，而SMBH则可能稍微不足。但是，上述结果受我们的样品选择的约束，该样品与质量低的宿主星系和/或大型类准通量比率有偏见。
Active galactic nuclei (AGNs) are key for understanding the coevolution of galaxies and supermassive black holes (SMBHs). AGN activity is thought to affect the properties of their host galaxies, via a process called "AGN feedback", which drives the co-evolution. From a parent sample of 1151 z < 1 type-1 quasars from the Sloan Digital Sky Survey quasar catalog, we detected host galaxies of 862 of them in the high-quality grizy images of the Subaru Hyper Suprime-Cam (HSC) survey. The unprecedented combination of the survey area and depth allows us to perform a statistical analysis of the quasar host galaxies, with small sample variance. We fit the radial image profile of each quasar as a linear combination of the point spread function and the Sersic function, decomposing the images into the quasar nucleus and the host galaxy components. We found that the host galaxies are massive, with stellar mass Mstar > 10^(10) Msun, and are mainly located on the green valley. This trend is consistent with a scenario in which star formation of the host galaxies is suppressed by AGN feedback, that is, AGN activity may be responsible for the transition of these galaxies from the blue cloud to the red sequence. We also investigated the SMBH mass to stellar mass relation of the z < 1 quasars, and found a consistent slope with the local relation, while the SMBHs may be slightly undermassive. However, the above results are subject to our sample selection, which biases against host galaxies with low masses and/or large quasar-to-host flux ratios.
