ASCA observation of ultra-luminous X-ray sources in the nearby spiral galaxy NGC 2403

被引：15
|
作者：
Kotoku, J
Mizuno, T
Kubota, A
Makishima, K
机构：
[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[2] Hiroshima Univ, Fac Sci, Dept Phys, Higashihiroshima 7398526, Japan
来源：
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2000年 / 52卷 / 06期
关键词：
black hole physics; galaxies : individual (NGC 2403); galaxies : spiral; X-rays : galaxies;
D O I：
10.1093/pasj/52.6.1081
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The spiral galaxy NGC 2403 was observed with ASCA, and three previously known X-ray sources (sources 3, 4, and 5) were detected. Among them, the observed 0.5-10 keV flux of source 3 is 1.4 x 10(-12) erg s(-1) cm(-2), implying a bolometric luminosity of 3.0 x 10(39) erg s(-1). Its spectrum can be explained by emission from an optically thick accretion disk with an inner-disk temperature of 1.1 keV. The spectrum and the high luminosity suggest that source 3 is a mass-accreting black hole binary. The observed properties of source 3 can be interpreted in terms of a black hole of mass similar to 15 M., accreting at near the Eddington rate.
引用
收藏
页码：1081 / 1085
页数：5
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