COMPTEL detection of pulsed gamma-ray emission from B1509-58 up to at least 10 MeV

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dc.creatorKuiper, L.
dc.creatorHermsen, W.
dc.creatorKrijger, J. M.
dc.creatorBennett, K.
dc.creatorCarraminana, A.
dc.creatorSchoenfelder, V.
dc.creatorBailes, M.
dc.creatorManchester, R. N.
dc.date1999-03-31
dc.date.accessioned2026-07-07T02:31:04Z
dc.date.available2026-07-07T02:31:04Z
dc.descriptionWe report on the first firm detection of pulsed gamma-ray emission from PSR B1509-58 in the 0.75-30 MeV energy range in CGRO COMPTEL data collected over more than 6 years. The modulation significance in the 0.75-30 MeV pulse-phase distribution is 5.4 sigma and the lightcurve is similar to the lightcurves found earlier between 0.7 and 700 keV: a single broad asymmetric pulse reaching its maximum 0.38 +/- 0.03 in phase after the radio peak, compared to the offset of 0.30 found in the CGRO BATSE soft gamma-ray data, and 0.27 +/- 0.01 for RXTE (2-16 keV), compatible with ASCA (0.7-2.2 keV). Spectral analysis based on the excess counts in the broad pulse of the lightcurve shows that extrapolation of the OSSE power-law spectral fit with index -1.68 describes our data well up to 10 MeV. Above 10 MeV the spectrum breaks abruptly. The precise location of the break/bend between 10 and 30 MeV depends on the interpretation of the structure in the lightcurve measured by COMPTEL and EGRET above 10 MeV.
dc.description15 pages, 10 figures, accepted for publication in Astronomy and Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9903474
dc.identifierhttp://arxiv.org/abs/astro-ph/9903474
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14035
dc.subjectAstrophysics
dc.titleCOMPTEL detection of pulsed gamma-ray emission from B1509-58 up to at least 10 MeV
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