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在遥远的亚毫米亮度星系中的球形形成

Qing-Hua Tan^1,2, Emanuele Daddi³, Benjamin Magnelli⁴

¹Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, People's Republic of China. qhtan@pmo.ac.cn.

|December 5, 2024

概括

大多数恒星是在银河系球体中形成的, 这项研究揭示了球体直接来自遥远星系的恒星形成, 挑战了以前的模型.

科学领域:

天文学与天体物理学
宇宙结构的形成

背景情况:

当今宇宙中的大多数恒星都存在于星系球体 (星系凸起和圆星系) 中.
这些球体的形成机制仍然是天体物理学中的一个重大未解决的问题.
之前的研究将高红移/亚毫米亮度星系与球形形成联系起来,但由于尘埃遮蔽和数据限制而面临挑战.

研究的目的:

调查高红移星系与球形形成之间的直接联系.
克服诸如尘埃遮蔽和微米观测中的有限信号噪声比等观测挑战.

主要方法:

使用阿塔卡马大毫米/亚毫米阵列 (ALMA) 来分析高红移星系的亚毫米表面亮度.
检查这些星系的轴比分布以确定它们的三维形状.
将观测数据与宇宙模拟进行比较.

主要成果:

证明球体是由早期宇宙中的明亮星爆星系的核心中直接生成的.
ALMA的图形显示出与指数盘模型的显著偏差, 显示出紧的三轴结构.
观察到大多数研究的星系是三轴的,轴比平均为0.5,随着紧密度的增加而增加.

结论:

星爆星系是球形形成的直接来源.
星系的相互作用和合并由非共平面气体积聚推动,
这为球体组合提供了具有宇宙意义的途径.

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