An interpretation of the narrow positron annihilation feature from X-ray nova MUSCAE 1991

Details An interpretation of the narrow positron annihilation feature from X-ray nova MUSCAE 1991 An interpretation of the narrow positron annihilation feature from X-ray nova MUSCAE 1991

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403l..71c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 403, no. 2, p. L71-L74.

Astronomy and Astrophysics

Astronomy

12

Binary Stars, Black Holes (Astronomy), Gamma Ray Spectra, Novae, Positron Annihilation, X Ray Sources, Accretion Disks, Astronomical Models, Line Spectra, Red Shift

Scientific paper

The physical mechanism responsible for the narrow redshifted positron annihilation gamma-ray line from the X-ray nova Muscae 1991 is studied. The orbital inclination angle of the system is estimated and its black hole mass is constrained under the assumptions that the annihilation line centroid redshift is purely gravitational and that the line width is due to the combined effect of temperature broadening and disk rotation. The large black hole mass lower limit of 8 solar and the high binary mass ratio it implies raise a serious challenge to theoretical models of the formation and evolution of massive binaries.

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