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Detectability of gamma-ray emission from classical novae with SwiftBAT.pdf

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Detectability of gamma-ray emission from classical novae with SwiftBAT

a r X i v : 0 8 0 4 .4 7 9 1 v 1 [ a s t r o - p h ] 3 0 A p r 2 0 0 8 Astronomy Astrophysics manuscript no. paper˙novae˙30Apr08˙PRINTER c? ESO 2008 April 30, 2008 Detectability of gamma-ray emission from classical novae with Swift/BAT F. Senziani 1,2,3,4 , G.K. Skinner 5,6 , P. Jean 4 , and M. Hernanz 7 1 Universita? di Pavia, Dipartimento di Fisica Nucleare e Teorica, Via Agostino Bassi 6, I–27100 Pavia, Italy 2 Istituto Universitario di Studi Superiori (IUSS), V.le Lungo Ticino Sforza 56, I–27100 Pavia, Italy 3 INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, Via Bassini 15, I–20133 Milano, Italy 4 CESR/Universite? Toulouse III, 9, avenue du Colonel Roche, Toulouse 31028, France 5 NASA/Goddard Space Flight Center, Code 661, Greenbelt, MD 20771, USA 6 CRESST/Dept. of Astronomy, University of Maryland CP, College Park, MD 20742, USA 7 IEEC-CSIC, Campus UAB, Fac. Cienc., C5-par, 2on, 08193 Bellaterra, Spain Received / Accepted ABSTRACT Context. Classical novae are expected to emit gamma rays during their explosions. The most important contribution to the early gamma-ray emission comes from the annihilation with electrons of the positrons generated by the decay of 13N and 18F . The photons are expected to be down-scattered to a few tens of keV, and the emission is predicted to occur some days before the visual discovery and to last ～2 days. Despite a number of attempts, no positive detections of such emission have been made, due to lack of sensitivity and of sky coverage. Aims. Because of its huge field of view, good sensitivity, and well-adapted (14-200 keV) energy band, Swift/BAT offers a new opportunity for such searches. BAT data can be retrospectively used to search for prompt gamma-ray emission from the direction of novae after their optical discovery. Methods. We have estimated the expected success rate for the detection with BAT of gamma rays from classical novae using a Monte Carlo approach. Searches were performed for emission from novae occ