BeppoSAX observations of the accretion-powered X-ray pulsar SMC X-1
arXiv:astro-ph/0402096 · doi:10.1051/0004-6361:20040048
Abstract
We present here results obtained from three BeppoSAX observations of the accretion-powered X-ray pulsar SMC X-1 carried out during the declining phases of its 40--60 days long super-orbital period. Timing analysis of the data clearly shows a continuing spin-up of the neutron star. Energy-resolved timing analysis shows that the pulse-profile of SMC X-1 is single peaked at energies less than 1.0 keV whereas an additional peak, the amplitude of which increases with energy within the MECS range, is present at higher energies. Broad-band pulse-phase-averaged spectroscopy of the BeppoSAX data, which is done for the first time since its discovery, shows that the energy spectrum in the 0.1--80 keV energy band has three components, a soft excess that can be modeled as a thermal black-body, a hard power-law component with a high-energy exponential cutoff and a narrow and weak iron emission line at 6.4 keV. Pulse-phase resolved spectroscopy indicates a pulsating nature of the soft spectral component, as seen in a few other binary X-ray pulsars, with a certain phase offset with respect to the hard power-law component. Dissimilar shape and phase of the soft and hard X-ray pulse profiles suggest a different origin of the soft and hard components.
arXiv comment8 Pages, 6 figures, Accepted for publication in A&A
References in corpus (9)
- Observations of Accreting Pulsars
- Quasi-Periodic Occultation by a Precessing Accretion Disk and Other Variabilities of SMC X-1
- Long-term Properties of Accretion Disks in X-ray Binaries: I. the variable third period in SMC X-1
- Nature of the Soft Spectral Component in the X-ray Pulsars SMC X-1 and LMC X-4
- Timing and spectral studies of LMC X-4 in high and low states with Beppo-SAX: Detection of pulsations in the soft spectral component
- Spectral variations of the X-ray binary pulsar LMC X-4 during its long period intensity variation and a comparison with Her X-1
- Deep XMM-Newton observation of a northern LMC field: I. Selected X-ray sources
- Accretion column eclipses in the X-ray pulsars GX 1+4 and RX J0812.4-3114
- Timing and spectral studies of the transient X-ray pulsar EXO 053109-6609.2 with ASCA and Beppo-SAX
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