Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..201l&link_type=abstract
In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 201-208 (SEE N92-21874 12-90)
Astronomy and Astrophysics
Astronomy
Accretion Disks, Backscattering, Compton Effect, Electron Scattering, Photons, Positron Annihilation, Continuums, Emission Spectra, Gamma Ray Astronomy, Gamma Ray Observatory, Line Spectra, Stellar Spectra
Scientific paper
It is shown that Compton scattering of 511 keV electron-positron annihilation radiation produces a line like feature at approx. 170 keV from backscattered photons. Assuming a simple model of an accretion disk around a compact source, the spectrum is explored of the spectrum of Compton scattered annihilation line emission for a range of conditions. It is further shown that such Compton baskscattering of annihilation line emission from the inner edge of an accretion disk could account for the previously unidentified 170 keV line emission and high energy continuum observed from a variable, compact source, or sources, of annihilation radiation near the Galactic Center. Identification of the observed 170 keV line as an annihilation line reflection feature provides strong new evidence that the source of the emission is an accreting compact object. Further study of these features in existing spectra and in forthcoming GRO observation of these and other sources can provide unique new diagnostics of the innermost regions of accretion disks around compact objects.
Hua Xin-Min
Lingenfelter Richard E.
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