The pulse phase-dependent spectrum of the anomalous x-ray pulsar 1rxs j170849-400910
Aug, 20015 pages
Published in:
- Astrophys.J.Lett. 560 (2001) L65
e-Print:
- astro-ph/0108506 [astro-ph]
DOI:
View in:
Citations per year
Abstract: (arXiv)
We report on the results of a 50ks BeppoSAX observation of 1RXS J170849-400910, one of the five (plus a candidate) known anomalous X-ray pulsars. The BeppoSAX data are consistent with a power-law plus blackbody spectral decomposition, making 1RXS J170849-400910 the fourth source of this class for which such a spectral decomposition was found. The inferred power-law slope and blackbody temperature are Gamma~2.6 and kT_BB~0.46keV, respectively. We found significant energy-dependence of the pulse profile, a remarkable feature for an AXP. By using the power-law plus blackbody decomposition we detected a significant variation in at least one spectral parameter, the power-law photon index, as a function of the pulse phase. This is the first significant detection of spectral parameter variation in an AXP. The implications of these results are briefly discussed.References(17)
Figures(0)