论文标题
pōniuā'ena：发光$ z = 7.5 $ quasar主持15亿太阳能黑洞
Pōniuā'ena: A Luminous $z=7.5$ Quasar Hosting a 1.5 Billion Solar Mass Black Hole
论文作者
论文摘要
我们从我们的广阔的电场式 - 类星体调查中报告了$ z = 7.515 $（“pōniuā'ena”）的发光类星体，J1007+2115。 J1007+2115是现在以$ z> 7.5 $而闻名的第二个类星体，深入到电离时代。类星体由$（1.5 \ pm0.2）\ times10^9 $ $ m _ {\ odot} $ Supermassive Black Hole（SMBH），基于其Gemini和Keck近IIR光谱的广泛MGII发射线。 J1007+2115中的SMBH的巨大是$ z = 7.54 $的Quasar J1342+0928中的两倍，当前的Quasar Redshift记录持有人。大爆炸发生后仅7亿年，这种大规模SMBH的存在显着挑战了最早的SMBH增长模型。 Eddington有限积聚的模型假设和0.1的辐射效率需要$ \ gtrsim 10^{4} $ $ M _ {\ odot} $的种子黑洞，$ z = 30 $。这一要求表明，由于直接崩溃而导致的黑洞种子或较早的黑洞生长，并具有超伊德丁顿积聚和/或低辐射效率。我们在J1007+2115的LY $α$线轮廓上的中性氢（IGM）中的中性氢吸收（IGM）中刻有阻尼机翼签名，并发现它比J1342+0928和其他两个$ Z \ gtrsim7 $ quasars弱弱。我们估计一个IgM音量平均中性分数$ \ langle x \ rm_ {hi} \ rangle = 0.39^{+0.22} _ { - 0.13} $。这种值范围表明，零散的电源历史记录了不同的IgM视线。我们在J1007+2115中检测到158 $ $ m [C II]发射线；这条线质心产生$ z = 7.5149 \ pm0.0004 $的系统性红移，并表示其主机银河系中的星形形成率为$ \ sim210 $ \ sim210 $ $ m _ {\ odot} $ yr $^{ - 1} $。
We report the discovery of a luminous quasar, J1007+2115 at $z=7.515$ ("Pōniuā'ena"), from our wide-field reionization-era quasar survey. J1007+2115 is the second quasar now known at $z>7.5$, deep into the reionization epoch. The quasar is powered by a $(1.5\pm0.2)\times10^9$ $M_{\odot}$ supermassive black hole (SMBH), based on its broad MgII emission-line profile from Gemini and Keck near-IR spectroscopy. The SMBH in J1007+2115 is twice as massive as that in quasar J1342+0928 at $z=7.54$, the current quasar redshift record holder. The existence of such a massive SMBH just 700 million years after the Big Bang significantly challenges models of the earliest SMBH growth. Model assumptions of Eddington-limited accretion and a radiative efficiency of 0.1 require a seed black hole of $\gtrsim 10^{4}$ $M_{\odot}$ at $z=30$. This requirement suggests either a massive black hole seed as a result of direct collapse or earlier periods of rapid black hole growth with hyper-Eddington accretion and/or a low radiative efficiency. We measure the damping wing signature imprinted by neutral hydrogen absorption in the intergalactic medium (IGM) on J1007+2115's Ly$α$ line profile, and find that it is weaker than that of J1342+0928 and two other $z\gtrsim7$ quasars. We estimate an IGM volume-averaged neutral fraction $\langle x\rm_{HI}\rangle=0.39^{+0.22}_{-0.13}$. This range of values suggests a patchy reionization history toward different IGM sightlines. We detect the 158 $μ$m [C II] emission line in J1007+2115 with ALMA; this line centroid yields a systemic redshift of $z=7.5149\pm0.0004$ and indicates a star formation rate of $\sim210$ $M_{\odot}$ yr$^{-1}$ in its host galaxy.
