Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5487795 | New Astronomy | 2017 | 8 Pages |
Abstract
We report here a pulse profile evolution study of an accreting X-ray pulsar LMCÂ X-4 during and after the large X-ray flares using data from the two observatories XMM-Newton and RXTE. During the flares, the pulse profiles were found to have a significant phase offset in the range of 0.2-0.5 compared to the pulse profiles immediately before or after the flare. Investigating the pulse profiles for about 105Â s after the flares, it was found that it takes about 2000-4000Â s for the modified accretion column to return to its normal structure and formation of an accretion stream that causes a dip in the pulse profile of LMCÂ X-4. We have also carried out pulse phase resolved spectroscopy of LMCÂ X-4 in narrow phase bins using data from EPIC-pn and spectroscopically confirmed the pulsating nature of the soft spectral component, having a pulse fraction and phase different from that of the power-law component.
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Astronomy and Astrophysics
Authors
Aru Beri, Biswajit Paul,