Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.339g&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The X-ray light curve and spectral properties of the millisecond X-ray pulsar/burster SAX J1808.4-3658 are reported. During the RXTE observations in April-May 1998 the 3-150 keV luminosity of the source decreased by a factor of ~100. However, the spectrum was stable and maintained a roughly power law shape with a photon index of ~2. An approximation of the averaged spectrum with an exponentially cut-off power law with a superimposed reflected component yields a lower limit on the e-folding energy ~270 keV. We speculate that Comptonization on the bulk motion in the radiation dominated shock might be a possible spectral formation mechanism. The decaying part of the X-ray light curve was cut off abruptly at L_X few times 1035 erg/s. Such behavior might be due to centrifugal inhibition of accretion as well as to disk instability. In either case an upper limit on magnetic field is B < few times 10^7 Gauss.
Churazov Eugene
Gilfanov Marat
Revnivtsev Mike
Sunyaev Rachid
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