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

[1]

BAGANOFF FK, 2001, UNPUB APJ

[2] AN ABUTTABLE CCD IMAGER FOR VISIBLE AND X-RAY FOCAL PLANE ARRAYS [J].

BURKE, BE ;

MOUNTAIN, RW ;

HARRISON, DC ;

BAUTZ, MW ;

DOTY, JP ;

RICKER, GR ;

DANIELS, PJ .

IEEE TRANSACTIONS ON ELECTRON DEVICES, 1991, 38 (05) :1069-1076

[3]

Genzel R, 1999, ASTR SOC P, V186, P3

[4]

GOTTHELF E, 1996, ASCA NEWS, V4, P31

[5] Restoration of the ASCA source position accuracy [J].

Gotthelf, EV ;

Ueda, Y ;

Fujimoto, R ;

Kii, T ;

Yamaoka, K .

ASTROPHYSICAL JOURNAL, 2000, 543 (01) :417-424

[6] ASCA view of our galactic center: Remains of past activities in X-rays? [J].

Koyama, K ;

Maeda, Y ;

Sonobe, T ;

Takeshima, T ;

Tanaka, Y ;

Yamauchi, S .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 1996, 48 (02) :249-255

[7]

MAEDA Y, 1998, IAU S, V188, P352

[8]

Makishima K, 1996, PUBL ASTRON SOC JPN, V48, P171, DOI 10.1093/pasj/48.2.171

[9] ASCA observations of the sagittarius B2 cloud:: An X-ray reflection-nebula [J].

Murakami, H ;

Koyama, K ;

Sakano, M ;

Tsujimoto, M ;

Maeda, Y .

ASTROPHYSICAL JOURNAL, 2000, 534 (01) :283-290

[10]

MURAKAMI H, 2000, BAAS, V196

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