Supergiant Fast X-ray Transients observed by INTEGRAL
Sergei A. Grebenev
TL;DR
This paper reviews the X-ray properties of Supergiant Fast X-ray Transients observed by INTEGRAL, highlighting the neutron star accretor with a strong magnetic field and the role of the centrifugal barrier in their outbursts.
Contribution
It provides a comprehensive review of observational data and proposes the centrifugal barrier as a key mechanism for their transient X-ray behavior.
Findings
Neutron stars with strong magnetic fields are the compact objects in these systems.
The centrifugal barrier may explain the abrupt X-ray outbursts and quiescence periods.
INTEGRAL observations have been crucial in understanding these transients.
Abstract
We review X-ray properties of the Supergiant Fast X-ray Transients following from their observations with INTEGRAL and show that a compact object in these systems is a neutron star with strong magnetic field accreting from the stellar wind of a donor star. We show that presence of a centrifugal barrier at the magnetospheric boundary of the neutron star may be a key to understanding of abrupt short X-ray outbursts of these transients and long intervals of their quiescence.
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