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    • A Quasar-Galaxy Merger at Z~6.2: Rapid Host Growth Via the Accretion of Two Massive Satellite Galaxies

    ASTRONOMY & ASTROPHYSICS（2024）

    INAF | NSFs NOIRLab | Univ Studi Milano Bicocca | Univ Geneva | Princeton Univ | Leiden Univ | Univ Arizona | Max Planck Inst Astron | Univ Florida | Natl Radio Astron Observ | Harvard & Smithsonian | Max Planck Inst Astrophys | MIT | Northwestern Coll | Univ Cologne | Univ Hamburg | Tel Aviv Univ | Univ Groningen | Sorbonne Univ | Huazhong Univ Sci & Technol | Tsinghua Univ

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    Abstract
    We present JWST/NIRSpec integral field spectroscopy in the rest-frame optical bands of the system PJ308--21, a quasar at $z=6.2342$ caught as its host galaxy interacts with companion galaxies. We detect the spatially extended emission of several emission lines ( and ), which we used to study the properties of the ionized phase of the interstellar medium: the source and hardness of the photoionizing radiation field, metallicity, dust reddening, electron density and temperature, and star formation. We also marginally detected continuum starlight emission associated with the companion sources. We find that at least two independent satellite galaxies are part of the system. While the quasar host appears highly enriched and obscured, with photoionization conditions typical of an Active Galactic Nucleus, the western companion shows minimal dust extinction, low metallicity ($Z and star formation driven photoionization. The eastern companion shows higher extinction and metallicity ($Z compared to the western companion, and it is at least partially photoionized by the nearby quasar. We do not find any indication of AGN in the companion sources. Our study shows that while the quasar host galaxy is already very massive dyn it is still rapidly building up by accreting two relatively massive star companion sources. This dataset showcases the power of JWST in exposing the buildup of massive galaxies in the first gigayear of the Universe.
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    galaxies: high-redshift,galaxies: ISM,galaxies: star formation,quasars: individual: PJ308-21
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    【要点】：该论文通过JWST/NIRSpec IFU光谱观测到红移6.2342的类星体PJ308-21及其主星系与伴星系的相互作用，揭示了至少两个伴星系参与了该系统的合并，并突出了通过合并两个相对较重的伴星系(M_star∼ 10^10 M_⊙)迅速增长的主星系的独特性。
    

    【方法】：论文使用了JWST/NIRSpec积分场光谱技术，在类星体PJ308-21的主星系和伴星系的相互作用系统的 rest-frame 光学波段进行了观测。
    

    【实验】：研究检测到了几种发射线（Hα, Hβ, [OIII], [NII], [SII], HeII），并利用这些发射线研究了星系间介质电离相的属性，如辐射场的源和硬度、金属量、尘埃红移、电子密度和温度以及星系形成。同时，还边缘检测到与伴星系相关联的连续星光发射。研究发现在该系统中至少有两个独立的伴星系，而类星体主机看起来高度富集且受遮蔽，具有类似活动 galactic nucleus (AGN) 的电离条件，而位于西侧的伴星系则显示出最小的尘埃消光、低金属量（Z∼0.4 Z_⊙）和由星系形成驱动的电离。位于东侧的伴星系与西侧伴星系相比，消光更高、金属量也更高（Z∼0.8 Z_⊙），并且至少部分受到附近类星体的电离影响。研究未在伴星系中发现任何 AGN 的迹象。
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