标题： 盘星系形成半解析模型 II. 暗物质与修正牛顿动力学的对比 显示英文标题

标题： Semi-Analytical Models for the Formation of Disk Galaxies II. Dark Matter versus Modified Newtonian Dynamics

摘要： 我们提出了详细的半解析模型，用于描述在暗物质（DM）主导的宇宙以及力的规律由修正牛顿动力学（MOND）给出的宇宙中盘星系的形成。 我们将这些模型调整以拟合观测到的近红外图-傅里叶关系，并将由此得到的模型的众多预测与观测结果进行比较。 暗物质和MOND模型几乎无法区分。 它们都产生与观测结果相符的良好一致的气体质量分数和动力学质量-光度比。 两种模型均重现了全局质量-光度比与中心面亮度之间的狭窄关系，并揭示出一个特征加速度，这与暗物质模型未能预测这些关系的说法相矛盾。 两种模型都需要超新星反馈来再现高表面亮度矮星系的缺乏。 然而，将反馈引入MOND模型会使其图-傅里叶关系变得陡峭且增加散射，使得MOND仅勉强与观测结果一致。 暗物质模型面临的最严重问题是其对陡峭中心旋转曲线的预测。 然而，暗物质的旋转曲线仅略陡于MOND模型，且仅在低分辨率数据对LSB星系的研究上稍显不一致。 显示英文摘要

摘要： We present detailed semi-analytical models for the formation of disk galaxies both in a Universe dominated by dark matter (DM), and in one for which the force law is given by modified Newtonian dynamics (MOND). We tune the models to fit the observed near-infrared Tully-Fisher (TF) relation, and compare numerous predictions of the resulting models with observations. The DM and MOND models are almost indistinguishable. They both yield gas mass fractions and dynamical mass-to-light ratios which are in good agreement with observations. Both models reproduce the narrow relation between global mass-to-light ratio and central surface brightness, and reveal a characteristic acceleration, contrary to claims that these relations are not predicted by DM models. Both models require SN feedback in order to reproduce the lack of high surface brightness dwarf galaxies. However, the introduction of feedback to the MOND models steepens the TF relation and increases the scatter, making MOND only marginally consistent with observations. The most serious problem for the DM models is their prediction of steep central rotation curves. However, the DM rotation curves are only slightly steeper than those of MOND, and are only marginally inconsistent with the poor resolution data on LSB galaxies.