论文标题
Quasar Sightline和Galaxy Evolution（QSAGE）调查-II。在z = 1-2处的紫外线类星体周围的星系过度繁殖
Quasar Sightline and Galaxy Evolution (QSAGE) survey -- II. Galaxy overdensities around UV luminous quasars at z=1-2
论文作者
论文摘要
我们证明，Z = 1-2处的最亮的类星体生活在过度密集的环境中。这是基于对沿着红移范围z = 1-2的紫外线的紫外线到紫外线的紫外线沿紫外线的紫外线的深层空间望远镜WFC3 G141 G141 G141 Grism光谱的分析。这构成了WFC3执行的一些最深的Grism光谱，其4卷角分布在一年的观察中，以减轻重叠光谱的效果。在研究的12个类星体中，有8个显示了在类星体红移处的星系过度密度的证据。 Z = 1.50时PG0117+213的过度繁殖中的一种可能是光谱镜确认的成员，由19种安全红移和17个带有单线红移的成员组成，在半径约700 kpc的圆柱体内。据估计其光环质量为log（m/msol）= 14.7。这表明遥远的紫外线上的类星体周围的光谱和窄带观测可能是发现原始群体的绝佳途径。我们的发现与先前对类星体种群和理论工作的统计观察结果的提示相符，因为反馈调节的黑洞生长预测了类星体光度与光晕质量之间的相关性。我们还介绍了类星体本身的高信号到噪声光谱光谱和光度特性。
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.
