An Investigation of Physical Factors that Determine Galaxy Structure Based upon a New Method of Quantitative Analysis.

该项目的目的是在对大量星系图像进行定量分析的基础上，了解哪些物理因素造成了各种各样的星系结构。本项目为期5年，主要成果如下：1.星系结构的研究。我们发现：（1）决定星系整体结构的物理因素有两个;（2）决定星系形状多样性的主要因素是球状组分的结构，而不是盘状组分的结构;（3）星系的总光度与平均相空间密度之间存在着很好的相关性。最后的关联将成为理解暗物质存在下星系形成机制的有力工具。(4)对定量分析中的几个问题进行了较详细的研究。包括内吸收、紫外辐射、星系的特殊性和图像处理技术.银河系数据库已建成一个包含约800个星系二维光度分布的数据库。这本书将在全世界范围内分发给那些对它感兴趣的人。天文图像数据处理系统。本文介绍了一种在专用超小型计算机上开发的高效天文图象数据处理系统。引进了一台照相底片扫描机，并作为该系统的一个组成部分成功地投入使用。

The aim of the project is to understand what physical factors are responsible for the wide variety of galaxy structure on the basis of quantitative analyses of a large number of galaxy images. Results of this 5-year project are summarized as follows.1. Investigation of Galaxy Structure. We have found that (1) the number of physical factors that determine the global structure of galaxies is two, (2) the leading factor which is responsible for the wide variety of galaxian shape is the structure of the spheroidal component rather than that of the disk component, and (3) there is a well-bahaved correlation between the total luminosity of galaxies and the average phase-space density. The last correlation will ne a powerful tool to understand the mechanism of galaxy formation in the presence of dark matter. (4) Several problems related to the quantitative analyses have been studied in some detail. They include internal absorption, ultraviolet rediation, and peculiarity of galaxies, and image processing technique.2. Database of Galaxies A database has been constructed which includes two-dimensional luminosity distribution of about 800 galaxies. The detabase will be distributed on the world-wide basis to those who are interested in it.3. Astronomical Image Data Processing System. An efficient astronomical image data processing system has been developed on a dedicated superminicomputer with a variety of image I/O peripherals. A photographic plate scanning machine was introduced and has been successfully operated as an integral part of the system.