High energy characteristics of Neutron star low mass X-ray binaries as seen by INTEGRAL: the 4U 1722-30 case
Proceedings of An INTEGRAL view of the high-energy sky (the first 10 years) - 9th INTEGRAL Workshop and celebration of the 10th anniversary of the launch — PoS(INTEGRAL 2012)(2013)
摘要
We report here results on the long time behaviour of the variable source 4U 1722-30, obtained from INTEGRAL non-continuous observations carried out between 2003 and 2009. During this period 4U 1722-30 shows a general persistent emission along with several bright outbursts resembling those of transient X-ray sources/X-ray novae. However the source never switches into a real quiescent state, with very weak or undetectable flux level, as it normally occurs in transient sources. We compare here flux ratios and spectral state variations measured during the different outbursts and highlight the peculiar character of the 2008 outburst, for which we also propose a specific physical explanation.
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关键词
high energy characteristics,star,x-ray
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