螺旋星系中的MOND理論和M/L函數之研究

Abstract

無蹤質量一直是天文學中一個難解的謎題，它的來由是由於觀測螺旋星系的旋轉曲線時，和牛頓力學所預測的有所不同。而Modified Newtonian dynamics(MOND)就是要來解決這類問題的一個理論。它是由Milgrom (1983)所提出的一個構想。他指出當g的值小於一個典型的g0（~1.2 × 10−8 cm s−2）的時候，原本的重力場需要做一個修正。對於暗物質的問題，這個理論展現出了相當的可行性。本論文就是以此理論為根據，來計算螺旋星系的質光比。期望能找到質量與光度的關係，進而更進一步的瞭解螺旋星系以及其動力學。

The disappearance of masses is puzzle of astronomy. When we observe the spiral galaxies , we get the different rotation curve from the prediction of Newtonian dynamics. Modified Newtonian dynamics proposed that gravitational field needs modifications when the field strength g is weaker than critical value g0 g0（~1.2 × 10−8 cm s−2）. It was suggest by Milgrom in 1983, this has been shown to be a good candidate as an alternative to cosmic dark matter. In this paper , we start with this theory , and use it to calculate the M/L function of spiral galaxies. We hope it could help us to find the relation of mass and luminosity. Finally we could more understand the dynamics of spiral galaxies and the underlying physics.