High-energy pulse profile of the transient X-ray pulsar SAX J2103.5+4545

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作者：
Falanga, M. [1 ]
Di Salvo, T. [2 ]
Burderi, L. [3 ]
Bonnet-Bidaud, J.M. [1 ]
Goldoni, P. [1 ]
Goldwurm, A. [1 ]
Lavagetto, G. [2 ]
Iaria, R. [2 ]
Robba, N.R. [2 ]
机构：
[1] CEA Saclay, DSM/DAPNIA, Service d'Astrophysique (CNRS FRE 2591), 91191 Gif-sur-Yvette, France
[2] Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, via Archirafi 36, 90123 Palermo, Italy
[3] Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, Italy
来源：
Astronomy and Astrophysics | 2005年 / 436卷 / 01期
关键词：
Data acquisition - Morphology - Radiation - Scattering - Spectrum analysis;
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摘要：
Two recent INTEGRAL papers report a timing and spectral analysis of the transient Be/X-ray pulsar SAX J2103.5+4545 at high energies (5-200 keV). In this work we present for the first time a study of the pulse profile at energies above 20 keV using INTEGRAL data. The spin-pulse profile shows a prominent (with a duty cycle of 14%) and broad (with a FWHM of ∼51 s) peak and a secondary peak which becomes more evident above 20 keV. The pulsed fraction increases with energy from ∼45% at 5-40 keV to ∼80% at 40-80 keV. The morphology of the pulse profile also changes as a function of energy, consistent with variations in the spectral components that are visible in the pulse phase resolved spectra. A study of the double peaked profile shows that the difference in the two peaks can be modeled by a different scattering fraction between the radiation from the two magnetic poles. © ESO 2005.
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页码：313 / 316
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