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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Luminous quasars do not live in the most overdense regions of galaxies at z?～?4
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Luminous quasars do not live in the most overdense regions of galaxies at z?～?4

机译：发光类星体不在z？〜？4的最密集星系区域中生活

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We present the cross-correlation between 151 luminous quasars (MUV???26) and 179 protocluster candidates at z?～?3.8, extracted from the Wide imaging survey (～121?deg2) performed as part of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). We find that only two out of 151 quasars reside in regions that are more overdense compared to the average field at 4?σ. The distributions of the distances between quasars and the nearest protoclusters and the significance of the overdensity at the positions of quasars are statistically identical to those found for g-dropout galaxies, suggesting that quasars tend to reside in almost the same environment as star-forming galaxies at this redshift. Using stacking analysis, we find that the average density of g-dropout galaxies around quasars is slightly higher than that around g-dropout galaxies on 1.0–2.5?pMpc scales, while at 0.5?pMpc that around quasars tends to be lower. We also find that quasars with higher UV luminosity or with more massive black holes tend to avoid the most overdense regions, and that the quasar near-zone sizes are anti-correlated with overdensity. These findings are consistent with a scenario in which luminous quasars at z?～?4 reside in structures that are less massive than those expected for the progenitors of today’s rich clusters of galaxies, and possibly that luminous quasars may be suppressing star formation in their close vicinity.
机译：我们展示了151个发光类星体（MUV？ 4？σ的平均场相比，在151个类星体中只有两个居住在密度更高的区域。类星体到最近的前团簇之间的距离分布以及类星体位置处的超密度意义在统计学上与针对g脱落星系所发现的分布相同，这表明类星体往往与恒星形成星系居住在相同的环境中在这个红移。使用堆叠分析，我们发现类星体周围的g缺失星系的平均密度在1.0–2.5？pMpc尺度上略高于g缺失星系的平均密度，而在<0.5？pMpc范围内，类星体的平均密度往往较低。我们还发现，具有较高UV发光度或更大质量黑洞的类星体往往会避开最密集的区域，并且类星体的近区大小与超密度是反相关的。这些发现与以下情形相吻合：z？〜？4处的发光类星体居住在比今天丰富的星系团的祖先预期的结构质量小的结构中，并且发光类星体可能在其近距离处抑制了恒星的形成。附近。

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