Abstracts, Galactic Center Workshop '98
GCNEWS
A Newsletter for Galactic Center Research
This Volume was edited by Angela Cotera & Heino Falcke
email: gcnews@aoc.nrao.edu

ABSTRACT

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Is the Sgr B2 cloud an X-ray Reflection Nebula ?
Murakami, H.1,; Koyama, K.1,; Maeda, Y.2,; Sakano, M.1
1 Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan 2 Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802-6305, U.S.A.
ABSTRACT:
We present the results of the ASCA imaging spectroscopy of the giant
molecular cloud Sgr B2. The X-ray spectrum is found to
be very peculiar; it exhibits a strong emission line at 6.4 keV,
large absorption at low energy below 4 keV and pronounced
edge-structure at 7.1 keV. The X-ray image is found to be extended
with the peak position offset to the Galactic center direction by
about 1-2 arcminute from the core of the molecular cloud. This
morphology, as well as the X-ray spectrum, is well reproduced by a
model that a strong X-ray source located at the Galactic
center side is irradiating the molecular cloud Sgr B2, and only the
reflected and the fluorescent X-rays are in our line of sight.
Thus Sgr B2 is a new type of X-ray object, which may be called as an
``X-ray reflection nebula''. Possible implications of the Galactic center
activity related to this unique source are presented.
LINKS: Program, hiro@cr.scphys.kyoto-u.ac.jp
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