Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-07-26
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
5 pages, 4 figures, to appear in ApJL
Scientific paper
To account for the non-thermal emission from the classical nova V2491 Cygni, we perform a series of numerical calculations of radiative transfer of \gamma-ray photons from the radioactive isotope $^{22}$Na in the matter ejected from a white dwarf. Using a simple wind model for the dynamical evolution of the ejecta and a monte-carlo code, we calculate radiative transfer of the \gamma-ray photons in the ejecta. Repeated scattering of the \gamma-ray photons by electrons in the ejecta, i.e., Compton degradation, results in an extremely flat spectrum in the hard X-ray range, which successfully reproduces the observed spectrum of the X-ray emission from V2491 Cygni. The amount of the isotope $^{22}$Na synthesized in the ejecta is required to be 3\times 10^{-5} M_\odot to account for the flux of the hard X-ray emission. Our model indicates that the ejecta become transparent to the \gamma-ray photons within several tens days. Using the results, we briefly discuss the detectability of the \gamma-ray line emission by the {\it INTEGRAL} gamma-ray observatory and the {\it Fermi} Gamma-ray Space Telescope.
Shigeyama Toshikazu
Suzuki Akihiro
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