Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003omeg.conf...86m&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2000. Proceedings of the International Symposium. Held 19-21 January 2000 in Universi
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the ASCA results of imaging spectroscopy of the giant molecular cloud Sgr B2 at the Galactic center region. The X-ray spectrum is found to be very peculiar; it exhibits a strong emission line at 6.4 keV, a low energy cutoff below about 4 keV and a pronounced edge-structure at 7.1 keV. The X-ray image is extended and its peak position is shifted from the core of the molecular cloud toward the Galactic center by about 1-2 arcminute. Since 6.4-keV line is a K-alpha line from neutral iron, these features indicate that the molecular cloud is irradiated by an external X-ray source, and emits fluorescent and scattered X-rays. Thus Sgr B2 may be called an "X-ray reflection nebula". This new category of X-ray source is similar to the X-ray diagnosis of the material. We can obtain the information about the abundance of the molecular cloud from the X-ray spectrum. The "X-ray reflection nebula" is a probe for revealing the Galactic center environment.
Koyama Katsuji
Maeda Yoshiaki
Murakami Hitoshi
Sakano Masa
Tsujimoto Masahiro
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