ASCA View of Our Galactic Center: Remains of Past Activities in X-Rays?

Details ASCA View of Our Galactic Center: Remains of Past Activities in X-Rays? ASCA View of Our Galactic Center: Remains of Past Activities in X-Rays?

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..249k&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.249-255.

Astronomy and Astrophysics

Astronomy

259

Galaxies: Milky Way, Interstellar: Clouds, X-Rays: Sources, X-Rays: Spectra

Scientific paper

Detailed X-ray images and spectra of the galactic-center region up to 10 keV were obtained with ASCA. Diffuse thermal-emission with distinct Kalpha lines from highly ionized ions of various elements has confirmed the presence of an extended high-temperature plasma. The fluorescent X-ray emission from cold iron atoms in molecular clouds was also found, possibly due to irradiation by X-rays from the center, which was bright in the past, but is presently dim. The results suggest that the galactic center exhibited intermittent activities with a time-averaged energy generation rate comparable to Seyfert nuclei, a class of active galactic nuclei.

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