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arXiv 2402.12439astro-ph.GA
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邻近星系在恒星-总动力学质量关系中的重子性质

Baryonic properties of nearby galaxies across the stellar-to-total dynamical mass relation

Laura Scholz-Diaz, Ignacio Martin-Navarro, Jesus Falcon-Barroso, Mariya Lyubenova, Glenn van de Ven

AI总结:

本文基于CALIFA数据与动力学建模,发现星系的重子性质(年龄、金属丰度、角动量、形态和恒星形成率)同时依赖于恒星质量和暗物质晕质量,揭示暗物质晕在星系形成中的关键作用。

摘要:

在标准宇宙学模型中,星系的组装主要由其宿主暗物质晕的增长驱动。然而,在暗物质晕的中心,重子过程占据主导,导致了观测到的众多星系性质。重子物理与暗物质物理之间的耦合对于我们理解星系至关重要,但对理论模型和观测而言仍是一项挑战。本文中,我们证明实测的年龄、金属丰度、恒星角动量、形态和恒星形成率均与恒星质量和暗物质晕质量相关。利用动力学建模,我们发现,在固定恒星质量下,CALIFA星系随着其总质量增加而变得更年轻、更贫金属、更具旋转支撑,具有更高的恒星形成率和更晚型的形态,且恒星质量和总质量测量相互独立。这些结果表明,星系的形成及其重子性质并非仅随恒星质量变化,暗物质晕质量同样发挥着重要作用。

英文摘要:

In the standard cosmological model, the assembly of galaxies is primarily driven by the growth of their host dark matter halos. At the center of these halos, however, baryonic processes take over, leading to the plethora of observed galaxy properties. The coupling between baryonic and dark matter physics is central to our understanding of galaxies and yet, it remains a challenge for theoretical models and observations. Here, we demonstrate that measured ages, metallicities, stellar angular momentum, morphology and star formation rates, correlate with both stellar and halo mass. Using dynamical modeling, we find that at fixed stellar mass, CALIFA galaxies become younger, more metal-poor and rotationally supported, have higher star formation rates and later-type morphologies as their total mass increases, with independent stellar and total masses measurements. These results indicate that the formation of galaxies and thus their baryonic properties do not vary with stellar mass alone, with halo mass also playing an important role.

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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