Gamma-ray line emission from SS433

Details Gamma-ray line emission from SS433 Gamma-ray line emission from SS433

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.305...37l&link_type=abstract

Nature (ISSN 0028-0836), vol. 305, Sept. 1, 1983, p. 37-39. NASA-supported research.

Astronomy and Astrophysics

Astronomy

43

Eclipsing Binary Stars, Emission Spectra, Gamma Ray Astronomy, Variable Stars, Energy Spectra, Heao 3, Line Spectra, Spaceborne Astronomy

Scientific paper

Preliminary evidence for gamma ray line emission from the region of SS433 using the spectrometer aboard the HEAO 3 satellite is reported. One of the line features, located at an energy of 1.5 MeV, has a statistical significance of about six sigmas during a particular 18-day interval. Another feature appears near 1.2 MeV. Both features exhibit fractional linewidths of about one percent. The intensity of the 1.5 MeV feature is variable by a factor of about three on a time scale of days, and the 1.2 MeV feature is similarly variable. The combined power of the lines is about 2 x 10 to the 27th ergs/s, assuming isotropic emission. The observed energies can be interpreted in terms of a kinematic model published elsewhere as blue and red-shifted components of the 1.369 MeV line from a nuclear transition of Mg-24 from its first excited state to its ground state.

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