BeppoSAX observations of the X-ray binary pulsar 4U1626-67
Abstract
We report on observations of the low-mass X-ray binary 4U1626-67 performed during the BeppoSAX Science Verification Phase. We present the broad-band 0.1-100 keV pulse averaged spectrum, that is well fit by a two-component function: a 0.27 +/- 0.02 keV blackbody and an absorbed power law with a photon index of 0.89 +/- 0.02. A very deep and narrow absorption feature at 38 keV, attributable to electron cyclotron resonance, is clearly visible in the broad-band spectrum. It corresponds to a neutron star magnetic field strength of 3.3 x 10^{12} G. The 4U1626-67 pulse profiles show a dramatic dependance on energy: the transition between the low energy (E<10 keV) "bi-horned" shape to the high-energy (E>10 keV) sinusoidal profile is clearly visible in our data. The modulation index shows a monotonic increase with energy.
Cite
@article{arxiv.astro-ph/9712023,
title = {BeppoSAX observations of the X-ray binary pulsar 4U1626-67},
author = {M. Orlandini and D. Dal Fiume and F. Frontera and S. Del Sordo and S. Piraino and A. Santangelo and A. Segreto and T. Oosterbroek and A. N. Parmar},
journal= {arXiv preprint arXiv:astro-ph/9712023},
year = {2015}
}
Comments
4 pages, 2 figures. Uses espcrc2.sty (included). To appear in Proceedings of "The Active X-ray Sky: Results from BeppoSAX and Rossi-XTE"