Observational Study of Supernova Rates in Early-type Galaxies

这个项目的目的是通过监测日本一些公共天文台的中等大小(60厘米-105厘米)望远镜的星系来得出附近早期类型星系的超新星速率。主要观测工作始于1997年1月，由7个天文台合作完成，并将持续数年。早期类型星系中的超新星在星系本身及其炽热的星际气体的化学和动力学演化中发挥着重要作用。每个配备R波段滤光片和制冷CCD相机的望远镜都观测到了几个场。这些区域被选为包括附近星系团的致密核心。在最近一次观测后的两周内对每个场进行观测。对新的(或更亮的)物体的平场处理和检测是自动化的。为了通知监控状态，组织了一个WWW页面(http：//www.网波。或。Jp/-yfujita/白雪。用日语编写的Html)。这被发现是非常有用的，以弥补其他观测站对某些领域观测不足的影响。虽然到目前为止我们还没有探测到任何超新星，但该项目仍将继续与更多的天文台合作。

The aim of this project is to derive the supernova rates in nearby early type galaxies by monitoring galaxies with medium size (60cm--105cm) telescopes that belong to some public astoronomical observatories in Japan. Main observations started in January 1997 with the cooperation of seven observatiories, and will continue for some years with more participants.Supernovae in early type galaxies play an important role in the chemical and dynamical evolution of the galaxies themselves and their hot interstellar gas.Each telescope with the R-band filter and chilled CCD camera observes several fields. The fields are selected to include the dense cores of nearby clusters of galaxies. Each fields are observed within two weeks after the latest observation. The flatfielding and the detection of new (or brighter) objects are automated. To inform the monitoring status, a WWW page is organaized (http : //www. netwave. or. jp/-yfujita/snow. html, written in Japanese). This is found to be quite useful to compensate the lack of observation for some fields with other observatories. Though we have not detected any supernovae so far, this project will still continue with cooperation with more observatories.