Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-10
Mon.Not.Roy.Astron.Soc. 319 (2000) 350
Astronomy and Astrophysics
Astrophysics
12 pages, 17 figures, MNRAS in press
Scientific paper
10.1046/j.1365-8711.2000.03587.x
Models of Galactic 1.275 MeV emission produced by the decay of the radionuclide $^{22}$Na have been computed. Several frequency-spatial distributions of novae have been investigated using recent results of nova rates and spatial distributions of novae in our Galaxy. These models allow us to estimate the lower-limit of the $^{22}$Na mass ejected per ONe nova detectable with the future spectrometer (SPI) of the INTEGRAL observatory as a function of the frequency-spatial distribution of ONe novae in the Galaxy. Calculations using recent estimations of the expected $^{22}$Na mass ejected per ONe nova show that the detection of the Galactic emission of 1.275 MeV photons will be difficult with the future spectrometer of the INTEGRAL observatory, whereas the cumulative emission around the Galactic center has some chances to be detected during the deep survey of the central radian of the Galaxy.
Gomez-Gomar Jordi
Hernanz Margarida
Jean Pierre
Jose Jubin
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