6533b823fe1ef96bd127e24a
RESEARCH PRODUCT
High-Energy pulse profile of the Transient X-ray Pulsar SAX J2103.5+4545
Andrea GoldwurmLuciano BurderiP. GoldoniR. IariaN. R. RobbaMaurizio FalangaT. Di SalvoG. LavagettoJean-marc Bonnet-bidaudsubject
PhysicsX-rays : binariesScatteringAstrophysics::High Energy Astrophysical Phenomenapulsars : individual : SAX J2103.5+4545Astrophysics (astro-ph)Phase (waves)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsRadiationAstrophysicsSpectral linePulse (physics)Full width at half maximumPulsarbinaries : closeSpace and Planetary Scienceclose; pulsars : individual : SAX J2103.5+4545; X-rays : binaries [binaries]X-ray pulsardescription
In two recent INTEGRAL papers, Lutovinov et al. (2003) and Blay et al. (2004) 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-01-01 |