Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..178w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 178-186.
Astronomy and Astrophysics
Astronomy
2
Galactic Nuclei, Interstellar Matter, Molecular Clouds, Positron Annihilation, Stellar Mass, X Ray Binaries, Black Holes (Astronomy), Companion Stars, Elementary Particles, Milky Way Galaxy
Scientific paper
A model involving an evolutionary geometry is developed in order to explain the spectral features observed in the GC region in spring 1989, as well as the time evolution of these features. It is proposed that a single source, EXS, is the progenitor of both the 102 and 170 keV features detected by EXITE and HEXAGONE. It is argued that multiple positron point sources might be present in the GC, even if only two have been detected so far, via their different spectral signatures. In the present model, the pair plasma is formed during supercritical accretion flow states in the accretion disk surrounding a stellar mass black hole. Due to the large number of potential companion stars, as well as orbital parameters of this binary system, many different geometries and accretion rates are possible.
Durouchoux Ph.
Wallyn Pierre
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