Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007asthe.100..438k&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 100, No. 9, p. 438 - 443 (2007)
Astronomy and Astrophysics
Astronomy
X-Rays, Galactic Center
Scientific paper
The Kα line features of FeXXV (6.7keV) and FeXXVI (6.97keV) favor collisional excitation origin for the Galactic Center X-rays. The ionization and electron temperatures determined from the line flux ratios of Kα and Kβ in highly ionized Fe and Ni indicate that the Galactic Center diffuse X-rays are due to a high temperature plasma in ionization equilibrium. The 6.7keV line map exhibits a local excess, which could be a new young SNR. Similarly, the 2.45keV line (SXV) map exhibits many sub-structures, which could be either new SNRs or super bubbles. The 6.4keV line also exhibits many clumps. Sgr B2 shows a time variability in 10 years, which provides strong evidence that Sgr B2 is an X-ray reflection nebula irradiated by strong X-rays from the past (300 years ago) active Sgr A*
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