Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-24
Astrophys.J. 586 (2003) L65-L70
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures. Accepted for publication on ApJ Letters
Scientific paper
10.1086/374585
We report the results of a long observation of the anomalous X-ray pulsar 1RXS J170849-400910 obtained with the BeppoSAX satellite in August 2001. The best-fit phase-averaged spectrum was an absorbed power law plus blackbody model, with photon index Gamma~2.4 and a blackbody temperature of kT_bb~0.4 keV. We confirm the presence of significant spectral variations with the rotational phase of the pulsar. In the spectrum corresponding to the rising part of the pulse we found an absorption-like feature at ~8.1 keV (a significance of 4 sigma), most likely due to cyclotron resonant scattering. The centroid energy converts to a magnetic field of 9x10^11 G and 1.6x10^15 G in the case of electrons and protons, respectively. If confirmed, this would be the first detection of a cyclotron feature in the spectrum of an anomalous X-ray pulsar.
Angelini Lorella
Campana Sergio
Covino Stefano
Israel Gian Luca
Mereghetti Sandro
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