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Issue A&A
Volume 450, Number 2, May I 2006
Page(s) 617 - 623
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20054305

A&A 450, 617-623 (2006)
DOI: 10.1051/0004-6361:20054305

INTEGRAL observations of the Crab pulsar

T. Mineo1, C. Ferrigno1, L. Foschini2, A. Segreto1, G. Cusumano1, G. Malaguti2, G. Di Cocco2 and C. Labanti2

1  INAF IASF-Pa, via U. La Malfa 153, 90146 Palermo, Italy
    e-mail: teresa.mineo@ifc.inaf.it
2  INAF IASF-Bo, via P. Gobetti 101, 40129 Bologna, Italy

(Received 5 October 2005 / Accepted 5 January 2006)

Abstract
Aims.The paper presents the timing and spectral analysis of several observations of the Crab pulsar performed with INTEGRAL in the energy range 3-500 keV.
Methods.All these observations, when summed together provide a high statistics data set which can be used for accurate phase resolved spectroscopy. A detailed study of the pulsed emission at different phase intervals is performed.
Results.The spectral distribution changes with phase showing a characteristic reverse S shape of the photon index. Moreover the spectrum softens with energy, in each phase interval, and this behavior is adequately modeled over the whole energy range 3-500 keV with a single curved law with a slope variable with Log(E), confirming the BeppoSAX results on the curvature of the pulsed emission. The bending parameter of the log-parabolic model is compatible with a single value of $0.14\pm0.02$ over all phase intervals.
Conclusions.Results are discussed within the three-dimensional outer gap model.


Key words: stars: neutron -- pulsars: general -- pulsars: individual: PSR B0531+21 -- X-rays: stars

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