ASCA view of our galactic center: Remains of past activities in X-rays?

被引：395

作者：

Koyama, K

Maeda, Y

Sonobe, T

Takeshima, T

Tanaka, Y

Yamauchi, S

机构：

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

[2] NASA, GODDARD SPACE FLIGHT CTR, HIGH ENERGY ASTROPHYS LAB, GREENBELT, MD 20771 USA

[3] MAX PLANCK INST EXTRATERR PHYS, D-85748 GARCHING, GERMANY

[4] IWATE UNIV, COLL HUMANITIES & SOCIAL SCI, MORIOKA, IWATE 020, JAPAN

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 1996年 / 48卷 / 02期

关键词：

galaxies; Milky Way; interstellar; clouds; X-rays; sources; spectra;

D O I：

10.1093/pasj/48.2.249

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Detailed X-ray images and spectra of the galactic-center region up to 10 keV were obtained with ASCA. Diffuse thermal-emission with distinct K alpha lines from highly ionized ions of various elements has confirmed the presence of an extended high-temperature plasma. The fluorescent X-ray emission from cold iron atoms in molecular clouds was also found, possibly due to irradiation by X-rays from the center, which was bright in the past, but is presently dim. The results suggest that the galactic center exhibited intermittent activities with a time-averaged energy generation rate comparable to Seyfert nuclei, a class of active galactic nuclei.

引用

页码：249 / 255

页数：7

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