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arXiv 2005.12527astro-ph.GA
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理解基本平面和Tully Fisher关系

Understanding the Fundamental Plane and the Tully Fisher Relation

Jeremy Mould

摘要:

早期类型星系的大小、表面亮度和速度色散(“基本面”)之间的关系一直被认为是由它们在很大程度上由压力支持的恒星动力学平衡引起的。在宇宙时间内,这些星系通过合并形成而达到这种平衡所涉及的耗散和反馈可以对平面的方向负责。我们在6dF星系巡天中看到了表面亮度增强和年轻之间的相关性。这种“倾斜”与恒星质量、年龄、浓度、形状和金属丰度的相关性现在为进一步研究这些邻近星系的运动学和结构以及它们的初始质量函数和暗物质成分指明了方向。从表面上看,塔利·费希尔关系是一个更简单的一维标度关系。然而,由于晚型星系有凸起和盘,并且盘的表面密度仅是更大质量星系的标准,因此涉及到额外的参数。

英文摘要:

The relation between early type galaxy size, surface brightness and velocity dispersion, "the fundamental plane", has long been understood as resulting from equilibrium in their largely pressure supported stellar dynamics. The dissipation and feedback involved in reaching such an equilibrium through merger formation of these galaxies over cosmic time can be responsible for the orientation of the plane. We see a correlation between surface brightness enhancement and youth in the 6dF Galaxy Survey. Correlations of this `tilt' with stellar mass, age, concentration, shape and metallicity now point the direction for further work on the resolved kinematics and structure of these nearby galaxies and on their initial mass function and dark matter component. On the face of it, the Tully Fisher relation is a simpler one dimensional scaling relation. However, as late type galaxies have bulges as well as disks, and, as the surface density of disks is only standard for the more massive galaxies, additional parameters are involved.

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