Results from SWIFT/BAT Searches for Prompt Gamma-ray Emission from RS Ophiuchi and other Novae

Details Results from SWIFT/BAT Searches for Prompt Gamma-ray Emission from RS Ophiuchi and other Novae Results from SWIFT/BAT Searches for Prompt Gamma-ray Emission from RS Ophiuchi and other Novae

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..401..323s&link_type=abstract

RS Ophiuchi (2006) and the Recurrent Nova Phenomenon ASP Conference Series, Vol. 401, proceedings of the conference held 12-14 J

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Nova explosions are expected to be observable in the hard X-ray/γ-ray domain due to electron-positron annihilation comptonized down to a few tens of keV. Positrons come from the radioactive decay of short-lived isotopes. The period during which such emission is strong is predicted to be very short -- only a few hours -- and to precede the visual discovery of the nova. We present results from retrospective searches in the SWIFT/BAT data for γ-ray emission from the direction of 18 novae during the period 20 days before and after their discovery. In the case of the recurrent nova RS Oph we obtained a 9.9 sigma detection in the 14-25 energy band, but this emission is probably due to shocks in the ejecta. For the other novae upper limits have so far been obtained.

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