High-Energy pulse profile of the Transient X-ray Pulsar SAX J2103.5+4545

Abstract

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.

arXiv commentAccepted for publication as a research Note in Astronomy & Astrophysics

References in corpus (7)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• Gravitational Bending of Light Near Compact Objects
• The INTEGRAL/IBIS Scientific Data Analysis
• Discovery of the optical counterpart to the X-ray pulsar SAX J2103.5+4545
• Discovery of the Orbit of the Transient X ray Pulsar SAX J2103.5+4545
• Discovery of Pulsed X-ray Emission from the SMC Transient RX J0117.6-7330
• A Puzzling Paucity of Double Peaked X-ray Pulsars

Cited by in corpus (4)

• Timing Studies on RXTE Observations of SAX J2103.5+4545
• Long-term pulse profile study of the Be/X-ray pulsar SAX J2103.5+4545
• Recent activity of the Be/X-ray binary system SAX J2103.5+4545
• A large spin-up rate measured with INTEGRAL in the High Mass X-ray Binary Pulsar SAXJ2103.5+4545