科研之友
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摘要
We observed the neutron star X-ray transient 2S 1803-245 in quiescence with the X-ray satellite XMM-Newton, but did not detect it. An analysis of the X-ray bursts observed during the 1998 outburst of 2S 1803-245 gives an upper limit to the distance of <= 7.3 kpc, leading to an upper limit on the quiescent 0.5-10 keV X-ray luminosity of <= 2.8 x 10(32) erg s(-1) (3 sigma). Since the expected orbital period of 2S 1803-245 is several hours, this limit is not much higher than those observed for the quiescent black hole transients with similar orbital periods.
- 出版日期2007-10-1
