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We present the ASCA results of imaging spectroscopy of the giant molecularcloud Sgr B2. The X-ray spectrum is found to be very peculiar; it exhibits astrong emission line at 6.4 keV, a low energy cutoff below about 4 keV and apronounced edge-structure at 7.1 keV. The X-ray image is extended and its peakposition is shifted from the core of the molecular cloud toward the Galacticcenter by about 1--2 arcminute. The X-ray spectrum and the morphology are wellreproduced by a scenario that X-rays from an external source located in theGalactic center direction are scattered by the molecular cloud Sgr B2, and comeinto our line of sight. Thus Sgr B2 may be called an X-ray reflection nebula.Possible implications of the Galactic center activity related to this uniquesource are presented.Comment: 15 pages, 8 figures, AAS LaTeX, To be published in The Astrophysical  Journa

ASCAObservations of the Sagittarius B2 Cloud: An X‐Ray Reflection Nebula