期刊
ASTROPHYSICAL JOURNAL
卷 550, 期 1, 页码 297-300出版社
IOP PUBLISHING LTD
DOI: 10.1086/319737
关键词
Galaxy : center; ISM : clouds; ISM : individual (Sagittarius C); reflection nebulae; X-rays : ISM
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.
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