A Catalog of Seyfert, Nuclei, N Systems and Active Galactic Nuclei

关于类似于类恒星物体的物体的信息 例如Seyfert核和N系统已经收集了许多 年 在为最近出版的类星体分类时， 目录，许多最近发现的物体相对较小， 红移，这显然类似于类星体，因为他们的 连续谱和线谱，已经发现。许多 X射线技术发现的河外源， 称为活动星系核（AGN），属于这一类。 有时它们显然是正常星系的一部分， 他们的环境不太清楚。 去看将军 这些现象的性质，一个全面的清单，这样的 对象是必需的。 类似于以前的类星体目录 将编制目录。 要包含在星表中的对象必须有一个核心， 最主要的特征和光谱显示了 暴力活动显然不是由于正常的单一进化 恒星，即光谱必须显示非热的证据 连续光谱，有时是可变的，以及发射线光谱 以粗线条为主。 原子核可能经常是一个射电源 或X射线源。与类星体的情况一样， 通过各种技术发现：颜色;形态学;低 色散光谱学，包括光栅物镜棱镜 技术;以及通过无线电识别后的光学研究 或X射线技术。 首席研究员估计，该目录将 包含500到1000个对象。 他计划出版 1988年的目录

Information on objects that resemble quasi-stellar objects (QSOs) such as Seyfert nuclei and N systems has been collected for many years. In classifying objects for the recently published QSO catalog, many recently discovered objects with comparatively small redshifts, which clearly resemble QSOs in as far as their continuum and line spectra are concerned, have been found. Many of the extragalactic sources found by X-ray techniques, often called Active Galactic Nuclei (AGN), fall into this category. Sometimes they are clearly parts of normal galaxies, and in other cases their environment is less clear. To look at the general properties of these phenomena, a comprehensive list of such objects is required. A catalog similar to the previous QSO catalog will be prepared. Objects to be included in the catalog must have a nucleus that is the most dominant feature and a spectrum that shows evidence of violent activity clearly not due to the evolution of normal single stars, i.e. the spectrum must show evidence for a nonthermal continuum, sometimes variable, and an emission line spectrum dominated by broad lines. The nucleus may often be a radio source or an X-ray source. As in the case for QSOs, the objects have been found by a variety of techniques: colors; morphology; low dispersion spectroscopy, including the grism-objective prism techniques; and optical studies following identification by radio or X-ray techniques. The Principal Investigator estimates that this catalogue will contain between 500 and 1000 objects. He plans to publish the catalog in 1988.