类星体视线和星系演化（QSAGE）调查- II。z=1-2时UV亮类星体周围的星系超密度
Quasar Sightline and Galaxy Evolution (QSAGE) survey -- II. Galaxy overdensities around UV luminous quasars at z=1-2
摘要：
我们证明，紫外线最亮的类星体在z=1-2生活在过密的环境。这是基于深哈勃空间望远镜WFC 3 G141棱晶光谱的星系沿视线的红移范围z=1-2的紫外发光类星体的分析。这构成了WFC 3执行的一些最深的棱栅光谱，在一年的观测中使用了4个滚动角来减轻重叠光谱的影响。在所研究的12个类星体场中，有8个在类星体的红移处显示出星系过密度的证据。其中一个高密度星系PG 0117 +213，z=1.50，在一个半径约为700 kpc的圆柱体内，可能有36个光谱确认的成员，其中19个有稳定的红移，17个有单线红移。它的晕质量估计为log（M/Msol）=14.7。这表明，在遥远的紫外明亮类星体周围进行光谱和窄带观测可能是发现原星系团的绝佳途径。我们的研究结果与以前的类星体人口的统计观测和理论工作的提示，反馈调节黑洞增长预测类星体光度和晕质量之间的相关性。我们还介绍了类星体本身的高信噪比静止坐标系的光谱和光度特性。
英文摘要：
We demonstrate that the UV brightest quasars at z=1-2 live in overdense environments. This is based on an analysis of deep Hubble Space Telescope WFC3 G141 grism spectroscopy of the galaxies along the lines-of-sight to UV luminous quasars in the redshift range z=1-2. This constitutes some of the deepest grism spectroscopy performed by WFC3, with 4 roll angles spread over a year of observations to mitigate the effect of overlapping spectra. Of the 12 quasar fields studied, 8 display evidence for a galaxy overdensity at the redshift of the quasar. One of the overdensities, PG0117+213 at z=1.50, has potentially 36 spectroscopically confirmed members, consisting of 19 with secure redshifts and 17 with single-line redshifts, within a cylinder of radius ~700 kpc. Its halo mass is estimated to be log (M/Msol)=14.7. This demonstrates that spectroscopic and narrow-band observations around distant UV bright quasars may be an excellent route for discovering protoclusters. Our findings agree with previous hints from statistical observations of the quasar population and theoretical works, as feedback regulated black hole growth predicts a correlation between quasar luminosity and halo mass. We also present the high signal-to-noise rest-frame optical spectral and photometric properties of the quasars themselves.
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