Journal
ASTROPHYSICAL JOURNAL
Volume 558, Issue 2, Pages 687-692Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/322282
Keywords
Galaxy : center; ISM : clouds; ISM : individual (Sagittarius B2); X-rays : individual (Sagittarius B2); X-rays : ISM
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We present the first Chandra results of the giant molecular cloud Sagittarius B2 (Sgr B2), located about 100 pc away from the Galactic center. Diffuse X-rays are clearly separated from one-and-a-half-dozen resolved point sources. The X-ray spectrum exhibits pronounced iron K-shell transition lines at 6.40 keV (K alpha) and 7.06 keV (K beta), deep iron K-edge at 7.11 keV, and large photoelectric absorption at low energy. The absorption-corrected X-ray luminosity is similar to 1 x 10(35) ergs s(-1), 2 orders of magnitude larger than the integrated luminosity of all the resolved point sources. The diffuse X-rays come mainly from the southwest half of the cloud with a concave shape pointing to the Galactic center direction. These results strongly support the ASCA model that Sgr B2 is irradiated by an X-ray source at the Galactic center side.
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