Unresolved X-Ray Emission from the Galactic Ridge with ASCA

Details Unresolved X-Ray Emission from the Galactic Ridge with ASCA Unresolved X-Ray Emission from the Galactic Ridge with ASCA

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48l..15y&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.L15-L20.

Astronomy and Astrophysics

Astronomy

31

Galaxies: Milky Way, Galaxies: X-Rays, Interstellar: Medium, X-Rays: Spectra

Scientific paper

We report on the ASCA results of hard X-ray imaging and spectroscopic observations of the galactic ridge (the Scutum arm region). The bulk of X-rays in the field of view could not be explained by an integrated emission of resolved sources, indicating that most of the galactic-ridge X-rays are due to a diffuse thin hot plasma. The X-ray luminosity of discrete sources contributing to the galactic-ridge emission was estimated to be less than { ~ }2×10(33) erg s(-1) in the 2--10 keV energy band. Emission lines from helium-like Si, S, and Fe ions were confirmed in the spectra, which means that the galactic ridge X-ray emission can not be explained by a single temperature ionization equilibrium plasma model. We give some constraints on the origin of the galactic-ridge emission.

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