Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010fym..confe..23u&link_type=abstract
"The First Year of MAXI: Monitoring Variable X-ray Sources", 4th International MAXI Workshop held November 30 - December 2, 2010
Other
Scientific paper
The talk will review the INTEGRAL discovery of Supergiant Fast X-Ray Transient (SFXT) and in general the properties of the High Mass X-ray Binaries (HMXB) observed in the 8 years in orbit.
In fact, INTEGRAL has discovered a new class of strongly absorbed X-ray binaries during its initial observation of the Galaxy Center and Plane. The prototype is IGR J16318-4848, associated with a sgB[e] star. This discovery was mainly due to the INTEGRAL unique capability to monitor the galactic center and bulge area for long periods at an unprecedented sensitivity level (<0.2 mCrab) in the soft gamma-ray range (15 keV-10 MeV) if compared with other wide-field instruments. To date most of the members of this new class of HMXB has been discovered with INTEGRAL. More than half of these sources have supergiant companions and a substantial fraction are slow (˜ 100- 1000s) X-ray pulsars. They are embedded in dense environments and the emission is so heavily absorbed that these sources were not detected/identified before with soft X-ray instruments.
Among the class of HMXB INTEGRAL has discovered a puzzling new sub class of transient sources: the Supergiant Fast X-ray Transients (SFXT). They show short X and soft gamma-ray outbursts typically lasting from a fraction of an hour to a few hours. The total number of these sources is already comparable to that of persistent supergiant Xray binaries: what is the different physical process active in the tow cases? The nature of their short outbursts, in a few cases recurrent, is still not clear. The more plausible explanation is connected with clumps in the stellar wind accretion, eventually generated at some distance from the giant star by magnetic field.
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