Origin of the scatter in the X-ray luminosity of early-type galaxies observed with ROSAT

被引:69
作者
Matsushita, K [1 ]
机构
[1] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany
关键词
galaxies : elliptical and lenticular; cD; galaxies : ISM; X-rays : galaxies; X-rays : ISM;
D O I
10.1086/318389
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Statistical properties of X-ray luminosity and temperature are studied for 52 early-type galaxies based on the ROSAT PSPC data. All of the X-ray luminous galaxies show largely extended emission with a radius of a few times 10r(e), while X-ray faint galaxies do not show such a component. This leads to a division of early-type galaxies into two categories : X-ray extended and X-ray compact galaxies. Except for a few galaxies in dense cluster environments, the luminosity and temperature of X-ray compact galaxies are well explained by a kinematical heating of the gas supplied by stellar mass loss. In contrast, X-ray extended galaxies indicate large scatter in the X-ray luminosity. We discuss the notion that X-ray extended galaxies are the central objects of large potential structures and that the presence or absence of this potential is the main origin of the large scatter in the X-ray luminosity.
引用
收藏
页码:693 / 704
页数:12
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