ASCA observations of deep ROSAT fields — II. The 2–10 keV AGN luminosity function |
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| Authors: | Boyle Georgantopoulos Blair Stewart Griffiths Shanks Gunn & Almaini |
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| Institution: | Institut d'Estudis Espacials de Catalunya (IEEC), CSIC, Barcelona, Gran Capita 2–4, CP 08034, Spain; CESR (CNRS), avenue du Colonel Roche, BP 4346, 31028 Toulouse Cedex, France |
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| Abstract: | The explosion mechanism associated with thermonuclear supernovae (SNIa) is still a matter of debate. There is a wide agreement that high amounts of radioactive nuclei are produced during these events and they are expected to be strong γ-ray emitters. In the past, several authors have investigated the use of this γ-ray emission as a diagnostic tool. In this paper we have performed a complete study of the γ-ray spectra associated with all the different scenarios currently proposed. This includes detonation, delayed detonation, deflagration and the off-centre detonation. We have performed accurate simulations for this complete set of models in order to determine the most promising spectral features that could be used to discriminate among the different models. Our study is not limited to qualitative arguments. Instead, we have quantified the differences among the spectra and established distance limits for their detection. The calculations have been performed considering the best current response estimations of the SPI and IBIS instruments aboard INTEGRAL in such a way that our results can be used as a guideline to evaluate the capabilities of INTEGRAL in the study of Type Ia supernovae. For the purpose of completeness we have also investigated the nuclear excitation and spallation reactions as a possible secondary source of γ-rays present in some supernova scenarios. We conclude that this mechanism can be neglected because of its small contribution. |
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| Keywords: | supernovae: general gamma-rays: general |
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