X-Ray Spectra of the High-mass X-Ray Binary 4U 1700-37 Using BeppoSAX, Suzaku, and RXTE Observationsстатья
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Дата последнего поиска статьи во внешних источниках: 6 февраля 2017 г.
Аннотация:We present an X-ray spectral analysis of the high-mass binary 4U 1700-37 during its hard-soft state evolution. We use BeppoSAX, Suzaku, and Rossi X-ray Timing Explorer observations for this investigation. We argue that the X-ray broadband spectra during all of the spectral states can be adequately reproduced by a model consisting of a low-temperature blackbody component, two Comptonized components which are both due to the presence of a Compton cloud (CC) that up-scatters seed photons of Ts1 ≲ 1.4 keV and Ts2 < 1 keV, and an iron-line component. Using this model, we find that the photon power-law index is almost constant, Γ1 ∼ 2 for all spectral states. However, Γ2 shows behavior that is dependent on the spectral state. Namely, Γ2 is quasi-constant at the level of Γ2 ∼ 2 while the CC plasma temperature {{kT}}e(2) is less than 40 keV; on the other hand, Γ2 is in the range of 1.3 < Γ2 < 2 when {{kT}}e(2) is greater than 40 keV. We explain this quasi-stability of Γ during most of the hard-soft transitions of 4U 1700-37 in the framework of a model in which the resulting spectrum is described by two Comptonized components. We find that these Comptonized spectral components of the high-mass X-ray binaries 4U 1700-37 are similar to those previously found in neutron star (NS) sources. This index dependence versus both the mass accretion rate and kTe revealed in 4U 1700-37 is universal observational evidence for the presence of an NS in 4U 1700-37.