ASCA observations of NLS1s: BH mass estimation from X-ray variability and X-ray spectra

被引：29

作者：

Hayashida, K ^{[1
]}

机构：

[1] Osaka Univ, Dept Earth & Space Sci, Osaka 5600043, Japan

来源：

NEW ASTRONOMY REVIEWS | 2000年 / 44卷 / 7-9期

关键词：

galaxies : active; X-rays : galaxies; X-rays : variability; black hole : mass;

D O I：

10.1016/S1387-6473(00)00071-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

ASCA observations of Narrow-line Seyfert 1 galaxies (NLS1s) are presented. We focus on the black hole size of the NLS1 sources by employing two independent methods for the mass estimation; one is using X-ray variability, the other is using a blackbody fit to the soft component. Although the coincidence is not good for some sources, the mass estimated by these methods ranges from 10(5) to 10(7) M., systematically smaller than those for typical (broad line) Seyfert 1. We consider the small mass black hole to be the principal cause of the several extreme characteristics of the NLS1s. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：419 / 422

页数：4

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