世界主要天文台现有长缝摄谱仪器评述

ON the Long Slit Spectroscopy Capability of Several Main Observatories in the World

介绍并评估了ESO、AOO、IGN La Palma、CFHT、KPNO、Celo Tololo、Palomar及Calar Alto等主要天文台的长缝摄谱仪。

In this paper we give a general review and some comments about the facility for long slit spectroscopy in several main observatories such as ESO, AAO,ING La Palma, CFHT, KPNO, CTIO and Mount Palomar. We point out and ask people to pay attention on the very low light efficiency situation now we can get. Except slitless, no system has an all over light efficiency higher than 0.1 and for most systems it is even lower than 0.05.The field of view also is rather small, usually only 4 to 7 arcminutes. Indeed we need very large aperture telescope to collect more photons from the deep sky faint objects, for our developing countries the most important thing,is to save any photon inside the small aperture of our expensive telescopes. To improve not only the light efficiency but also the multi-objects efficiency so that we could win in some way by using rather smaller telescope.