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- W2964276612 abstract "The X-ray light curve and broad band spectral prop- erties of the millisecond X-ray pulsar/burster SAX J1808.4- 3658 are reported. In the course of RXTE observations in April- May 1998 the 3-150 keV luminosity of the source decreased by a factor of 100 from the peak value of 9 10 36 erg/s (for a 4 kpc distance). However, the spectrum was remarkably stable and maintained a roughly power law shape with a pho- ton index of 2 without a strong high energy cut-off below 100 keV, similar to that sometimes observed in the low spec- tral state of X-ray bursters. An approximation of the averaged spectrum with an exponentially cut-off power law with a super- imposed reflected component yields the 90% lower limit on the e-folding energy Ef > 270 keV. We speculate that Comptoniza- tion on the bulk motion in the radiation dominated shock might be a possible mechanism of spectral formation. The decaying part of the X-ray light curve was cut off abruptly at luminosity few 10 35 erg/s. Such behavior might be due to centrifugal inhibition of accretion (transition to the propeller regime) as well as to disk instability. In either case an upper limit on the neutron star magnetic field strength is B < few 10 7 Gauss." @default.
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- W2964276612 date "1998-12-01" @default.
- W2964276612 modified "2023-09-23" @default.
- W2964276612 title "The millisecond X-ray pulsar/burster SAX J1808.4-3658: the outburst light curve and the power law spectrum" @default.
- W2964276612 hasPublicationYear "1998" @default.
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