Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.3206v&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #32.06; Bulletin of the American Astronomical Society, Vol. 29, p.1259
Astronomy and Astrophysics
Astronomy
Scientific paper
The diffuse X-ray emission from the thin disk surrounding the Galactic mid-plane (or the so called Galactic ridge) was measured with RXTE PCA (1(deg) FWHM circular field of view, 2-60 keV energy band) in order to determine the spatial extent, spectral nature, and origin of the emission. The survey reveals that the diffuse emission is comprised of at least 2 spatial components: i) a thin disk of width 0.1(deg-0.7^deg) centered on the galactic mid-plane, and ii) a broadly distributed component that can be approximated as a Gaussian function with FWHM ~ 8(deg) . Spectral measurements in the 3-35 keV band reveal that the diffuse emission has both thermal and non-thermal origins. The thermal component can be well modelled by an absorbed Raymond-Smith plasma component of temperature 1-2 keV, while the power law is well represented with a photon index of ~ 2.5. The thermal component of the emission can be modelled by a collection of supernova remnants (SNR) in the galaxy. The non-thermal component is most likely due to non-thermal emission from the edge of SNR remnants, electron bremsstrahlung, and inverse Compton scattering. We will discuss possible contributions from each radiation mechanism.
Marshall Francis E.
Valinia Azita
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