Unusual diffuse X-ray source in the Galactic center region

Details Unusual diffuse X-ray source in the Galactic center region Unusual diffuse X-ray source in the Galactic center region

2001-09-30

arxiv.org/abs/astro-ph/0110011v1

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures, to be published in ApJ

Scientific paper

10.1086/324685

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 non-equilibrium ionization (NEI) plasma model of about 6-keV temperature. The model requires higher than solar metal abundances, a young plasma age of $\simeq$ 100 years and a large N_H value of about 10^{23} cm^{-2}. The N_H value constrains the source position to be in the Galactic center region at about 8.5 kpc distance. 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.

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