Unresolved X-ray emission from the galactic ridge with ASCA

被引：34

作者：

Yamauchi, S

Kaneda, H

Koyama, K

Makishima, K

Matsuzaki, K

Sonobe, T

Tanaka, Y

Yamasaki, N

机构：

[1] UNIV TOKYO, SCH SCI, DEPT PHYS, BUNKYO KU, TOKYO 113, JAPAN

[2] KYOTO UNIV, FAC SCI, DEPT PHYS, SAKYO KU, KYOTO 60601, JAPAN

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

[4] TOKYO METROPOLITAN UNIV, FAC SCI, DEPT PHYS, HACHIOJI, TOKYO 19203, JAPAN

来源：

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

关键词：

galaxies; Milky Way; X-rays; interstellar; medium; spectra; 6.7-KEV IRON LINE; EXOSAT; PLANE;

D O I：

10.1093/pasj/48.2.L15

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the ASCA results of hard X-ray imaging and spectroscopic observations of the galactic ridge (the Scutum arm region). The bulk of X-rays in the field of view could not be explained by an integrated emission of resolved sources, indicating that most of the galactic-ridge X-rays are due to a diffuse thin hot plasma. The X-ray luminosity of discrete sources contributing to the galactic-ridge emission was estimated to be less than similar to 2 x 10(33) erg s(-1) in the 2-10 keV energy band. Emission lines from helium-like Si, S, and Fe ions were confirmed in the spectra, which means that the galactic ridge X-ray emission can not be explained by a single temperature ionization equilibrium plasma model. We give some constraints on the origin of the galactic-ridge emission.

引用

页码：L15 / L20

页数：6

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