空间分离是大质量暗物质晕内外卫星星系各向异性熄灭的起源
Spatial segregation as the origin of anisotropic satellite quenching in haloes and beyond
- National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台)
- College of Astronomy and Space Sciences, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院)
- Universidad Autónoma de Madrid(马德里自治大学)
- Centro de Investigación Avanzada en Física Fundamental (CIAFF), Universidad Autónoma de Madrid(马德里自治大学基础物理前沿研究中心)
- Institute for Astronomy, University of Edinburgh(爱丁堡大学天体物理研究所)
- Department of Physics and Astronomy, University of the Western Cape(西开普大学物理与天文学系)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
本研究通过多种宇宙学模拟揭示,卫星星系各向异性熄灭主要源于已熄灭与未熄灭星系的空间分离,而非反馈作用,并提供了跨晕内外的统一几何解释。
AI中文摘要:
在大质量暗物质晕中,观测到卫星星系倾向于沿其中心星系的主轴方向优先熄灭。相比之下,活动星系核喷流倾向于指向短轴方向,这对活动星系核反馈在卫星星系熄灭中的作用施加了有趣的约束。在此,我们利用z=0时的SIMBA、TNG100、EAGLE和无反馈SIMBA宇宙学模拟表明,这种卫星各向异性主要源于已熄灭和未熄灭星系群之间的空间分离。已熄灭的卫星星系在中心更集中,并且与中心星系的主轴对齐更强,而未熄灭的卫星星系则占据更大的半径,且分布更接近各向同性。在没有恒星或活动星系核反馈的情况下,这种行为仍然持续存在,这表明反馈对卫星星系熄灭并不重要。在暗物质晕边界之外,信号在模拟之间变化很大,并与沿主轴方向的多余星系数量相关。这将大尺度各向异性熄灭与星系群、星系团和丝状环境的方位依赖分布联系起来。我们的结果为跨暗物质晕内外的各向异性卫星星系熄灭提供了一个统一的几何解释。
英文摘要:
Satellite galaxies in massive halos are seen to be preferentially quenched along the major axes of their central galaxies. In contrast, the AGN jet tends to point along the minor axis, which imposes interesting constraints on the role of AGN feedback in satellite galaxy quenching. Here we use the SIMBA, TNG100, EAGLE, and feedback-free SIMBA cosmological simulations at $z=0$ to show that this satellite anisotropy primarily originates from spatial segregation between quenched and unquenched populations. Quenched satellites are more centrally concentrated and more strongly aligned with the central galaxy's major axis, whereas unquenched satellites occupy larger radii and are more nearly isotropic. The persistence of this behaviour without stellar or active galactic nucleus feedback suggests that feedback is not important for satellite quenching. Beyond the halo boundary, the signal varies strongly among simulations and correlates with the excess number of galaxies along the major axis. This links large-scale anisotropic quenching to the direction-dependent distribution of groups, clusters and filamentary environments. Our results provide a unified geometrical interpretation of anisotropic satellite quenching across halo and extra-halo scales.