2002ApJ...565.1017S

We report the ASCA and Chandra discovery of a diffuse X-ray source in the Galactic center region. The X-ray spectrum is fitted with a nonequilibrium ionization (NEI) plasma model with a temperature of about 6 keV. The model requires higher than solar metal abundances, a young plasma age of ≃100 yr, and a large N_H value of about 10²³ cm^–2. The N_H value constrains the source position to be in the Galactic center region at a distance of about 8.5 kpc. The high resolution X-ray image with the Chandra ACIS shows a ring of 10" radius, which corresponds to 0.4 pc at the Galactic center, and a tail-like structure. Although the morphology is peculiar, the other X-ray features are likely to be a very young supernova remnant, possibly in a free expansion phase.