Volume 436, Number 1, June II 2005
|Page(s)||313 - 316|
|Section||Stellar structure and evolution|
|Published online||20 May 2005|
High-energy pulse profile of the transient X-ray pulsar SAX J2103.5+4545
CEA Saclay, DSM/DAPNIA/Service d'Astrophysique (CNRS FRE 2591), 91191 Gif-sur-Yvette, France e-mail: email@example.com
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
Accepted: 26 February 2005
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.
Key words: binaries: close / pulsars: individual: SAX J2103.5+4545 / X-rays: binaries
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.