arXiv 2009.066482020-09-14astro-ph.GA

Subaru High-Z Exploration of Low-Luminosity Quasars（SHELLQs）。XI。z~6处暗类星体光谱的邻近区分析

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra at z~6

Rikako Ishimoto, Nobunari Kashikawa, Masafusa Onoue, Yoshiki Matsuoka, Takuma Izumi, Michael A. Strauss, Seiji Fujimoto, Masatoshi Imanishi, Kei Ito, Kazushi Iw… 展开作者

Rikako Ishimoto, Nobunari Kashikawa, Masafusa Onoue, Yoshiki Matsuoka, Takuma Izumi, Michael A. Strauss, Seiji Fujimoto, Masatoshi Imanishi, Kei Ito, Kazushi Iwasawa, Toshihiro Kawaguchi, Chien-Hsiu Lee, Yongming Liang, Ting-Yi Lu, Rieko Momose, Yoshiki Toba, Hisakazu Uchiyama

备注：: 14 pages, 8 figures, Accepted for publication in ApJ
DOI：: 10.3847/1538-4357/abb80b

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摘要：

我们测量了斯巴鲁高-低光度类星体探测项目（SHELLQs）在$z\sim6$发现的11个低光度（$-26.16\leq M_{1450}\leq-22.83$）类星体的类星体邻近区（$R_p$）的大小。我们的微弱类星体样本将$R_p$测量值扩展到$M_{1450}=-22.83$等，在这个时期，更常见的类星体种群占主导地位。我们限制的样本类星体的系统红移已被精确测量的[CII] 158 $μ$ m或MgII $λ$ 2798发射线。我们还通过使用最新的系统红移结果更新了Eilers等人（2017）（arXiv：1703.02539）中提出的26个发光类星体的$R_p$测量。$R_p$的光度依赖性被发现是一致的假设高度电离的星系际介质的理论预测。我们发现了亮度校正的$R_p$，$R_{p,{\rm corr}}^{-25}$（$R_{p, \rm corr}^{-25}\propto(1+z)^{-3.79\pm1.72}$）在$5.8\lesssim z \lesssim6.6$上的浅红移演化。这一趋势比Eilers等人（2017）的趋势更陡，但比早期研究的趋势要浅得多。我们的结果表明，$R_{p,\rm corr}$是不敏感的中性分数的宇宙在$z\sim6$。四个类星体显示出非常小的$R_{p,\rm corr}^{-25}$（$ \lesssim0.90$ proper Mpc），这可能是它们在再电离时期的年轻年龄（$<10^4$ yr）的结果，尽管统计数据仍然很小。

英文摘要：

We present measurements of the size of the quasar proximity zone ($R_p$) for eleven low-luminosity ($-26.16\leq M_{1450}\leq-22.83$) quasars at $z\sim6$, discovered by the Subaru High-$z$ Exploration of Low-Luminosity Quasars project (SHELLQs). Our faint quasar sample expands the $R_p$ measurement down to $M_{1450}=-22.83$ mag, where more common quasar populations dominate at the epoch. We restrict the sample to quasars whose systemic redshifts have been precisely measured by [CII] 158 $μ$m or MgII $λ$2798 emission lines. We also update the $R_p$ measurements for 26 luminous quasars presented in Eilers et al. (2017)(arXiv:1703.02539) by using the latest systemic redshift results. The luminosity dependence on $R_p$ is found to be consistent with the theoretical prediction assuming highly ionized intergalactic medium. We find a shallow redshift evolution of the luminosity-corrected $R_p$, $R_{p,{\rm corr}}^{-25}$ ($R_{p, \rm corr}^{-25}\propto(1+z)^{-3.79\pm1.72}$) over $5.8\lesssim z \lesssim6.6$. This trend is steeper than that of Eilers et al. (2017) but significantly shallower than those of the earlier studies. Our results suggest that $R_{p,\rm corr}$ is insensitive to the neutral fraction of the universe at $z\sim6$. Four quasars show exceptionally small $R_{p,\rm corr}^{-25}$ ($ \lesssim0.90$ proper Mpc), which could be the result of their young age ($<10^4$ yr) in the reionization epoch, though statistics is still small.

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