Sidoli 2010 EXIST可能对超亮快X射线变源的观测

主要内容:

Supergiant Fast X-ray Transients (SFXTs) 是 High Mass X-ray Binaries involving about 20 sources to date, with 8 firmly identified SFXTs and many candidates.

the bright flares (peaking at 1E36-1E37erg/s)

EXIST是 Energetic X-ray Imaging Survey Telescope (EXIST)

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Title:		EXIST perspective for Supergiant Fast X-ray Transients
Authors:		Sidoli, L.; Sguera, V.; Bazzano, A.; Ubertini, P.
Publication:		eprint arXiv:1001.3234
Publication Date:		01/2010
Origin:		ARXIV
Keywords:		Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Comment:		Accepted for publication on PoS, Proceedings of "The Extreme sky: Sampling the Universe above 10 keV", held in Otranto (Italy) in October 2009
Bibliographic Code:		2010arXiv1001.3234S

Abstract

Supergiant Fast X-ray Transients (SFXTs) are one of the most intriguing (and unexpected) results of the INTEGRAL mission. They are a new class of High Mass X-ray Binaries involving about 20 sources to date, with 8 firmly identified SFXTs and many candidates. They are composed by a massive OB supergiant star as companion donor and a compact object. At least four SFXTs host a neutron star, because X-ray pulsations have been discovered, while for the others a black hole cannot be excluded. SFXTs display short X-ray outbursts (compared with Be/X-ray transients) characterized by fast flares on brief timescales of hours and large flux variability typically in the range 1,000-100,000. The INTEGRAL/IBIS sensitivity allowed to catch only the bright flares (peaking at 1E36-1E37erg/s), without persistent or quiescent emission. The investigation of their properties, in particular the rapid variability time scales of their flaring activity, will greatly benefit from observations with the Energetic X-ray Imaging Survey Telescope (EXIST), with the possibility to perform a long term and continuous as possible monitoring of the hard X-ray sky.

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