Unusual Diffuse X-Ray Source in the Galactic Center Region
Abstract
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 NH value of about 1023 cm-2. The NH 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 2002
- DOI:
- 10.1086/324685
- arXiv:
- arXiv:astro-ph/0110011
- Bibcode:
- 2002ApJ...565.1017S
- Keywords:
-
- Galaxy: Center;
- ISM: individual (G0.570-0.018;
- CXO J 174702.6-282733);
- ISM: Supernova Remnants;
- X-Rays: ISM;
- Astrophysics
- E-Print:
- 11 pages, 4 figures, to be published in ApJ