论文标题
高红移矮人星系的恒星种群
The stellar populations of high-redshift dwarf galaxies
论文作者
论文摘要
我们使用高分辨率（$ \ \ \ 10 $ pc），放大模拟（恒星质量$ M_ \ star \ star \ simeq10^{10} m_ \ odot $）Lyman Breakaxy（lbg）在$ z \ simeq 6 $中，以调查其6 dwaraxy satelliets sexelliits assellare stellar assellar sellar as sellar as sellar stellar stellar stellar intellar stellar stellar stellar stellar stellar seflar的群体， （m_ \ star/m_ \ odot）\ simeq 6-9 $ [$ \ log（m_ {gas}/m_ \ odot）\ simeq4.3-7.75 $]。卫星的特性和演变不依赖于中央大量LBG的距离（$ <11.5 $ kpc）。取而代之的是，他们的恒星形成和化学富集历史紧密地连接了其恒星（和下半升）质量。高质量矮人星系（$ \ rm m_ \ star \ gtrsim 5 \ times 10^8 m_ \ odot $）经历了漫长的星形形成历史，其特征是许多合并事件。低质量系统会经历一系列短星形成情节，没有合并的迹象。他们的恒星形成活动开始相对较晚（$ z \约7 $），并且内部恒星反馈迅速消除。尽管有不同的进化模式，但所有卫星都显示出球形的形态，古老的，较贫穷的恒星位于内部区域。所有六个矮人的卫星都经历了高星形的速率（$ \ rm> 5 \，m_ \ odot yr ^{ - 1} $）爆发，JWST可以在靶向高$ z $ lbgs时检测到。
We use high-resolution ($\approx 10$ pc), zoom-in simulations of a typical (stellar mass $M_\star\simeq10^{10}M_\odot$) Lyman Break Galaxy (LBG) at $z\simeq 6$ to investigate the stellar populations of its six dwarf galaxy satellites, whose stellar [gas] masses are in the range $\log (M_\star/M_\odot) \simeq 6-9$ [$\log (M_{gas}/M_\odot) \simeq4.3-7.75$]. The properties and evolution of satellites show no dependence on the distance from the central massive LBG ($< 11.5$ kpc). Instead, their star formation and chemical enrichment histories are tightly connected their stellar (and sub-halo) mass. High-mass dwarf galaxies ($\rm M_\star \gtrsim 5\times 10^8 M_\odot$) experience a long history of star formation, characterised by many merger events. Lower-mass systems go through a series of short star formation episodes, with no signs of mergers; their star formation activity starts relatively late ($z\approx 7$), and it is rapidly quenched by internal stellar feedback. In spite of the different evolutionary patterns, all satellites show a spherical morphology, with ancient and more metal-poor stars located towards the inner regions. All six dwarf satellites experienced high star formation rate ($\rm >5\,M_\odot yr ^{-1}$) bursts, which can be detected by JWST while targeting high-$z$ LBGs.
