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arXiv 2405.02468astro-ph.GA
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合并中 harboring 低光度双类星体的富气星系(z = 6.05):最亮类星体的有希望前身星系

Merging gas-rich galaxies that harbor low-luminosity twin quasars at z = 6.05: a promising progenitor of the most luminous quasars

Takuma Izumi, Yoshiki Matsuoka, Masafusa Onoue, Michael A. Strauss, Hideki Umehata, John D. Silverman, Tohru Nagao, Masatoshi Imanishi, Kotaro Kohno, Yoshiki To… 展开作者

Takuma Izumi, Yoshiki Matsuoka, Masafusa Onoue, Michael A. Strauss, Hideki Umehata, John D. Silverman, Tohru Nagao, Masatoshi Imanishi, Kotaro Kohno, Yoshiki Toba, Kazushi Iwasawa, Kouichiro Nakanishi, Mahoshi Sawamura, Seiji Fujimoto, Satoshi Kikuta, Toshihiro Kawaguchi, Kentaro Aoki, Tomotsugu Goto

AI总结:

本研究利用 ALMA 观测了 z = 6.05 处的一个低光度类星体对系统,发现其具有极高的气体质量、恒星形成率、潮汐相互作用及快速外流特征,模拟表明其并合后将演化为早期宇宙中最明亮、最极端的星暴类星体之一。

摘要:

我们报告了对最近在 z = 6.05 发现的一个类星体-类星体对系统(Matsuoka et al. 2024)进行的 ALMA [CII] 158 μm 谱线及其下方的远红外(FIR)连续谱发射观测(分辨率为 0''.57 × 0''.46)。这两个类星体核(C1 和 C2)较暗(M_1450 ≳ -23 mag),但我们探测到了非常明亮的 [CII] 发射,它桥接了两体之间 12 kpc 的区域并向外延伸(总光度 L_[CII] ≃ 6 × 10^9 L_⊙)。基于 [CII] 估算的系统总恒星形成率约为 550 M_⊙ yr^{-1}(基于红外估算的尘埃遮蔽 SFR 约为 100 M_⊙ yr^{-1}),基于 [CII] 估算的总气体质量约为 10^{11} M_⊙。这两个星系的动力学质量很大(C1 约为 9 × 10^{10} M_⊙,C2 约为 5 × 10^{10} M_⊙)。[CII] 中存在平滑的速度梯度,表明这些类星体是一个潮汐相互作用系统。我们在 C1 周围识别出一个动力学上截然不同的快速 [CII] 成分:对该处谱线的详细检查揭示了一个宽翼成分的存在,我们将其解释为速度约为 600 km s^{-1} 的快速外流的标志。在考虑多相气体后,这些外流的预期质量负载因子 ≳ 2-3,介于 AGN 驱动和星暴驱动的外流之间。文献中的流体动力学模拟预测,该类星体对在并合后将演化为一个光度极高(M_1450 ≲ -26 mag)、星暴剧烈(≳ 1000 M_⊙ yr^{-1})的类星体,这是早期宇宙中最极端的族群之一。

英文摘要:

We present ALMA [CII] 158 $μ$m line and underlying far-infrared (FIR) continuum emission observations ($0''.57 \times 0''.46$ resolution) toward a quasar-quasar pair system recently discovered at $z = 6.05$ (Matsuoka et al. 2024). The quasar nuclei (C1 and C2) are faint ($M_{\rm 1450} \gtrsim -23$ mag), but we detect very bright [CII] emission bridging the 12 kpc between the two objects and extending beyond them (total luminosity $L_{\rm [CII]} \simeq 6 \times 10^9~L_\odot$). The [CII]-based total star formation rate of the system is $\sim 550~M_\odot$ yr$^{-1}$ (IR-based dust-obscured SFR is $\sim 100~M_\odot$ yr$^{-1}$), with a [CII]-based total gas mass of $\sim 10^{11}~M_\odot$. The dynamical masses of the two galaxies are large ($\sim 9 \times 10^{10}~M_\odot$ for C1 and $\sim 5 \times 10^{10}~M_\odot$ for C2). There is a smooth velocity gradient in [CII], indicating that these quasars are a tidally interacting system. We identified a dynamically distinct, fast [CII] component around C1: detailed inspection of the line spectrum there reveals the presence of a broad wing component, which we interpret as the indication of fast outflows with a velocity of $\sim 600$ km s$^{-1}$. The expected mass loading factor of the outflows, after accounting for multiphase gas, is $\gtrsim 2-3$, which is intermediate between AGN-driven and starburst-driven outflows. Hydrodynamic simulations in the literature predicted that this pair will evolve to a luminous ($M_{\rm 1450} \lesssim -26$ mag), starbursting ($\gtrsim 1000~M_\odot$ yr$^{-1}$) quasar after coalescence, one of the most extreme populations in the early universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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