巨椭圆星系主导系统中星系速度距离关系递减的轨道解释

中文摘要 AI 辅助

在许多星系中观测到的近似平坦的旋转曲线持续存在，通常被解释为存在延展暗物质晕的证据，或表明在低加速度下引力定律需要修正。在本工作中，我们研究了一个替代性的轨道框架，用于解释由巨椭圆星系主导的星系系统的大尺度运动学。我们提出，被选中的非活动伴星系围绕一个主导的中心椭圆星系形成引力束缚的轨道系统，在概念上类似于太阳系。利用星系群星表以及NASA IPAC河外星系数据库的数据，我们分析了以M87、M60和NGC 1399为中心的三个独立系统。候选伴星系根据常见的观测和动力学标准进行选择，包括它们位于所采用的搜索体积内、近似的空间共面性，以及有效引力参数（Geff）的一致性。对于这三个系统，所得的速度距离关系呈现出随距中心椭圆星系距离增加而明显递减的趋势，在性质上与开普勒型轨道动力学一致。

英文摘要

The persistence of approximately flat rotation curves observed in many galaxies, is commonly interpreted as evidence for extended dark matter halos or as an indication of modified gravitational laws at low accelerations. In this work, we investigate an alternative orbital framework for the large scale kinematics of galaxy systems dominated by giant elliptical galaxies. We propose that selected non active companion galaxies form gravitationally bound orbital systems around a dominant central elliptical galaxy, conceptually analogous to the Solar System Using galaxy group catalogs together with data from the NASA IPAC Extragalactic Database, we analyze three independent systems centered on M87, M60, and NGC 1399. Candidate companions are selected according to common observational and dynamical criteria, including their location within the adopted search volume, approximate spatial coplanarity, and consistency of the effective gravitational parameter (Geff). For the three systems, the resulting velocity distance relations exhibit clear decreasing trends with increasing distance from the central elliptical galaxy, qualitatively consistent with Keplerian like orbital dynamics.

发表机构

• Abdelhamid Ibn Badis University（阿卜杜勒哈米德·伊本·巴迪斯大学）
• Elaboration and Characterization Physico-Mechanical and Metallurgical of Materials Laboratory (ECP3M), Abdelhamid Ibn Badis University-Mostaganem（阿卜杜勒哈米德·伊本·巴迪斯大学-穆斯塔加奈姆物理机械与冶金材料表征与制备实验室）
• University of Relizane（赖利赞大学）

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