KiDS-DR5:探索星系暗物质晕中的尘埃输运
KiDS-DR5: Exploring dust transport in dark matter halos of galaxies
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- Ruhr University Bochum(鲁尔大学波鸿)
- Harvard-Smithsonian Center for Astrophysics(哈佛-史密森天体物理中心)
- Center for Astrophysics | Harvard & Smithsonian(天体物理中心 | 哈佛与史密森学会)
- Newcastle University(纽卡斯尔大学)
- Leiden Observatory, Leiden University(莱顿大学莱顿天文台)
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中文总结 AI 辅助
本研究利用KiDS-DR5数据联合建模多波段星等偏移和引力透镜信号,测量星系暗物质晕质量与尘埃含量,发现恒星质量与尘埃质量呈线性关系,但比模型预测更平坦,表明尘埃反馈机制需改进。
中文摘要 AI 辅助
我们分析了千度巡天最终数据发布(KiDS-DR5)中一个定义明确的星系样本,该样本通过星等、光度红移和恒星质量截断进行选择,以测量其平均暗物质晕质量和环星系尘埃含量随恒星质量的变化。我们的目标是为星系晕中运行的尘埃输运机制(如恒星和活动星系核驱动的外流)提供经验约束。我们利用MICE2模拟开发并验证了一种新的测量和建模框架,该框架纳入了现实的环星系尘埃消光情景。利用该框架,我们联合建模多波段($ugriZYJHK_{\ m s}$)星等偏移和星系-星系引力透镜信号,以推断$z_{\ m B} < 0.4$处透镜星系的平均暗物质晕质量和尘埃质量,并在KiDS-DR5中按五个恒星质量区间进行分析。该建模联合描述了暗物质晕质量分布和尘埃消光,包括与邻近暗物质晕相关的尘埃。我们证明,数据要求包含卫星星系比例和来自邻近暗物质晕的尘埃消光。我们发现恒星质量与尘埃质量之间存在线性关系,这与先前的观测研究一致,但比半解析模型\ extsc{Dusty-SAGE}的预测更平坦。这一差异可能表明,当前星系形成模型中与尘埃相关的反馈实现需要进一步改进。
英文摘要
We analyse a well-defined sample of galaxies from the final data release of the Kilo-Degree Survey (KiDS-DR5), selected using magnitude, photometric redshift, and stellar mass cuts, to measure their mean halo mass and circumgalactic dust content as a function of stellar mass. Our goal is to provide empirical constraints on dust transport mechanisms, such as stellar- and AGN-driven outflows, operating in galaxy halos. We develop and validate a new measurement and modelling framework using the MICE2 simulation, incorporating a realistic circumgalactic dust extinction scenario. Using this framework, we jointly model multiband ($ugriZYJHK_{\rm s}$) magnitude shifts and galaxy--galaxy lensing signals to infer the mean halo mass and dust mass of lens galaxies at $z_{\rm B} < 0.4$, analysed in five stellar-mass bins in KiDS-DR5. The modelling jointly describes the halo mass distribution and dust extinction, including dust associated with neighbouring halos. We demonstrate that the inclusion of a satellite fraction and dust extinction from neighbouring halos is required by the data. We find a linear relation between stellar mass and dust mass, consistent with previous observational studies, but flatter than predictions from the semi-analytic model \textsc{Dusty-SAGE}. This difference may indicate that current implementations of dust-related feedback in galaxy formation models require further refinement.