ASCA discovery of diffuse 6.4 keV emission near the Sagittarius C complex:: A new X-ray reflection nebula

被引：51

作者：

Murakami, H ^{[1
]}

Koyama, K

Tsujimoto, M

Maeda, Y

Sakano, M

机构：

[1] Kyoto Univ, Fac Sci, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

[2] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[3] Natl Space Dev Agcy Japan, Space Utilizat Res Program, Tsukuba, Ibaraki 3058505, Japan

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 550卷 / 01期

关键词：

Galaxy : center; ISM : clouds; ISM : individual (Sagittarius C); reflection nebulae; X-rays : ISM;

D O I：

10.1086/319737

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an ASCA discovery of diffuse hard X-ray emission from the Sgr C complex with its peak in the vicinity of the molecular cloud core. The X-ray spectrum is characterized by a strong 6.4 keV line and large absorption. These properties suggest that Sgr C is a new X-ray reflection nebula that emits fluorescent and scattered X-rays via irradiation from an external X-ray source. We found no adequately bright source in the immediate Sgr C vicinity to fully account for the fluorescence. The irradiating source may be the Galactic nucleus Sgr A*, which was brighter in the past than it is now, as is suggested from observations of the first X-ray reflection nebula Sgr B2.

引用

页码：297 / 300

页数：4

共 19 条

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