1. Chandra X-ray Survey of the Galactic Center: On the Nature of the X-ray Emission
Q. Daniel Wang and Cornelia Lang
(U. of Massachusetts)
Eric Gotthelf (Columbia U.)
Based partly on a paper published in Nature (Jan. 10th issue) and on a talk presented at the AAS meeting, Jan. 9, 2002

2. GC

3. ASCA Survey of the Galactic Center+
Sakano et al. (2001)

4. Chandra X-ray Survey of the Galactic Center
0.8o (400 light-year) GC
2o (900 light-year)

5. Chandra X-ray Survey of the Galactic CenterGC
Red: 1-3 keV Green: 3-5 keV Blue: 5-8 keV

6. Central Region of the Survey

7. Galactic Center Across the Spectrum
Radio
Mid-infrared
6.4 keV line (fluorescent radiation)

8. Summary First high-resolution X-ray panorama of the Galactic center
 separation of discrete and diffuse X-ray emissions.
Detection of about 1,000 discrete X-ray sources
 presence of numerous white dwarf stars, neutron stars, and black holes.
Detection of large amounts of hot gas (tens of million degrees)
 heated and chemically enriched by frequent supernovae and escaping into the Galactic halo.
Map of the fluorescent (reflected) X-ray radiation
 tracing the radiation history of the central supermassive black hole.

9. These results represent an important step toward the understanding the high-energy activities in the heart of the Milky Way as well as cores of galaxies throughout the Universe.