SUPERNOVA SEARCH IN EARLY TYPE GALAXIES

我们与位于日本的7个公共天文台建立了一个项目，通过监测约30个场，每个场包含一个星系团，在早期星系中搜索超新星。该项目使用的望远镜口径从60厘米到1米不等。不幸的是，没有发现超新星。相反，发现了一颗具有大固有运动的恒星。我们开发了一个计算机程序来自动探测新出现的天体。我们中的一个人（Doi， M.）在用SUBARU进行遥远超新星调查的观测时使用了这个程序。这次调查发现了大约30个候选对象。用FOCAS对其中的7个候选物进行了光谱分析，发现它们实际上是la超vae型。在理论尝试方面，我们提出了一个模型来解释M87周围存在的热气，其中室女座星系团中较热的星系团内物质的传导热通量阻止了气体被强辐射冷却。我们还开发了一个星系恒星形成历史的模型，假设大多数恒星是由超新星卷起的物质形成的。这个模型再现了银河系晕和一些局部矮球状星系的恒星形成历史。

We have constructed a project with 7 public astronomical observatories located in Japan to search supernovae in early type galaxies by monitoring 〜30 fields each of which contains a cluster of galaxies. The apertures of telescopes used in this project range from 60 cm to 1 m. Unfortunately, no supernova has been found. Instead, a star with a large proper motion was found.We have developed a computer program to automatically detect newly emerging celestial objects. One of us (Doi, M.) utilized this program when he performed an observation for distant supernova survey with SUBARU. This survey found 〜30 candidate objects. The spectra for 7 of this candidates were taken with FOCAS and it was found that they are actually type la supemovae.As for theoretical attempts, we have proposed a model to explain the existence of hot gas surrounding M87 in which the conductive heat flux from the hotter intra-cluster matter of the Virgo cluster prevent the gas from being cooled by intense radiation. We have also developed a model for star formation history of galaxies assuming most of stars were formed from the matter swept up by supernovae. This model reproduces star formation histories of the Galactic halo and some local dwarf spheroidal galaxies.