X-RAY STUDY OF NGC-1399 IN THE FORNAX CLUSTER OF GALAXIES

被引：24

作者：

IKEBE, Y

OHASHI, T

MAKISHIMA, K

TSURU, T

FABBIANO, G

KIM, DW

TRINCHIERI, G

HATSUKADE, I

YAMASHITA, K

KONDO, H

机构：

[1] OSSERV ASTROFIS ARCETRI,I-50125 FLORENCE,ITALY

[2] MIYAZAKI UNIV,DEPT ELECTR ENGN,MIYAZAKI 88921,JAPAN

[3] INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN

[4] HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 384卷 / 01期

关键词：

GALAXIES; INDIVIDUAL; (NGC-1399); INTERGALACTIC MEDIUM; X-RAYS;

D O I：

10.1086/186227

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Observations of the cD galaxy NGC 1399 in the Fornax cluster of galaxies with Ginga have detected extended X-ray emission out to a radius of more than approximately 360 kpc. The energy spectrum of this emission is well fitted with an optically thin thermal spectrum with kT = 1.46(-0 21)+0.05 keV with a strong iron emission line corresponding to an iron abundance of 1.1(-0.5)+1.3 times solar. The mass of the hot gas responsible for the X-ray emission is nearly the same as the total stellar mass of the cluster. Therefore, the presence of iron at near-solar abundance suggests that the mass of the hot gas ejected from galaxies is comparable to the total stellar mass. This result indicates that most of the hot gas in a very poor cluster is created through ejections from galaxies, rather than being primordial.

引用

页码：L5 / L8

页数：4

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