RXTE measurement of the diffuse X-ray emission from the Galactic ridge: implications for the energetics of the Interstellar Medium

Details RXTE measurement of the diffuse X-ray emission from the Galactic ridge: implications for the energetics of the Interstellar Medium RXTE measurement of the diffuse X-ray emission from the Galactic ridge: implications for the energetics of the Interstellar Medium

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69..629v&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 629-632.

Physics

Nuclear Physics

Scientific paper

The diffuse X-ray emission from the thin disk surrounding the Galactic mid-plane (the so-called Galactic ridge) was measured with RXTE PCA in order to determine the spatial extent, spectral nature, and origin of the emission. Spatial analysis of the emission in the central 30 deg of the plane in Galactic longitude reveals the presence of a thin component of width ~0 deg.2 and a broad component that can be approximated as a Gaussian distribution with FWHM of ~8 deg. The spectrum can be interpreted as the superposition of the two spatial components with differing amount of absorption. Each spatial component can be modelled with a Raymond-Smith plasma component of temperature ~2keV and a power law component with photon index of ~2.5. Based on these findings, we argue that the temperature of the hot phase of the Interstellar Medium (ISM) is less than the previously reported values of 5-15keV. We find that a supernova explosion rate of ~1-5 per century is adequate to power the thermal emission from the ridge. We discuss the origin of the emission in the hard X-ray band in terms of non-thermal bremsstrahlung of accelerated electrons and protons in supernova remnant (SNR) sites.

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