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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Enhancement of galaxy overdensity around quasar pairs at z??3.6 based on the Hyper Suprime-Cam Subaru Strategic Program Survey
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Enhancement of galaxy overdensity around quasar pairs at z??3.6 based on the Hyper Suprime-Cam Subaru Strategic Program Survey

机译：基于Hyper Suprime-Cam Subaru战略计划调查，z≤<3.6的类星体对周围星系密度的增强

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We investigate the galaxy overdensity around proto-cluster scale quasar pairs at high (z??3) and low (z?～?1) redshift based on the unprecedentedly wide and deep optical survey of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). Using the first-year survey data covering effectively ～121?deg2 with the 5σ depth of i?～?26.4 and the SDSS DR12Q catalog, we find two luminous pairs at z?～?3.3 and 3.6 which reside in 5σ overdensity regions of g-dropout galaxies at i??25. The projected separations of the two pairs are R⊥?=?1.75 and 1.04 proper Mpc (pMpc), and their velocity offsets are ΔV?=?692 and 1448?km?s?1, respectively. This result is in clear contrast to the average z?～?4 quasar environments as discussed in Uchiyama et?al. (2018, PASJ 70, S32) and implies that the quasar activities of the pair members are triggered via major mergers in proto-clusters, unlike the vast majority of isolated quasars in general fields that may turn on via non-merger events such as bar and disk instabilities. At z?～?1, we find 37 pairs with R⊥??2?pMpc and ΔV??2300?km?s?1 in the current HSC-Wide coverage, including four from Hennawi et?al. (2006, AJ, 131, 1). The distribution of the peak overdensity significance within two arcminutes around the pairs has a long tail toward high-density (4σ) regions. Thanks to the large sample size, we find statistical evidence that this excess is unique to the pair environments when compared to single-quasar and randomly selected galaxy environments at the same redshift range. Moreover, there are nine small-scale (R⊥??1?pMpc) pairs, two of which are found to reside in cluster fields. Our results demonstrate that 2?pMpc scale quasar pairs at both redshift ranges tend to occur in massive haloes, although perhaps not the most massive ones, and that they are useful in searching for rare density peaks.
机译：我们基于Hyper Suprime-Cam Subaru战略计划前所未有的广泛和深入的光学调查，调查了高（z？>？3）和低（z？〜？1）红移的原始集群规模类星体对附近的星系密度。 HSC-SSP）。利用第一年有效覆盖〜121？deg2和5σ深度为i？〜？26.4的第一年调查数据，以及SDSS DR12Q目录，我们在z？〜？3.3和3.6处发现了两个发光对，它们位于大于5σ的高密度区域。 i？<？25的g漏失星系。这两对的投影间隔分别为R 3 ＝ 1.75和1.04适当的Mpc（pMpc），它们的速度偏移分别为ΔV2 ＝ 692和1448km·s·s 1。这个结果与Uchiyama等人讨论的平均z？〜？4类星体环境形成鲜明对比。 （2018，PASJ 70，S32）并暗示这对成员的类星体活动是通过原始团簇中的重大合并触发的，这与一般领域中绝大多数孤立类星体可能通过非合并事件（如酒吧）开启的情况不同。和磁盘不稳定。在z？〜？1处，我们发现在目前的HSC-Wide覆盖范围内，有37对具有R⊥？<？2？pMpc和ΔV？<？2300？km？s？1的对，其中包括Hennawi等人的四对。 （2006，AJ，131，1）。绕线对两弧分之内的峰值超密度显着性分布朝向高密度（>4σ）区域有一条长尾巴。由于样本量大，我们发现统计证据表明，与同等红移范围内的单类星体和随机选择的星系环境相比，这种过量对于配对环境是唯一的。此外，有九个小规模的（R 1≤＜1 1 pMpc）对，发现其中两个驻留在簇域中。我们的结果表明，在两个红移范围内，<2？pMpc尺度的类星体对都倾向于出现在大量的光环中，尽管可能不是最重的光环，并且它们可用于寻找稀有的密度峰。

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