SIMBAD references

2015A&A...576L...4R - Astronomy and Astrophysics, volume 576, L4-4 (2015/4-1)

Giant outburst from the supergiant fast X-ray transient IGR J17544-2619: accretion from a transient disc ?

ROMANO P., BOZZO E., MANGANO V., ESPOSITO P., ISRAEL G., TIENGO A., CAMPANA S., DUCCI L., FERRIGNO C. and KENNEA J.A.

Abstract (from CDS):

Supergiant fast X-ray transients (SFXTs) are high mass X-ray binaries associated with OB supergiant companions and characterized by an X-ray flaring behaviour whose dynamical range reaches 5 orders of magnitude on time scales of a few hundred to thousands of seconds. Current investigations concentrate on finding possible mechanisms to inhibit accretion in SFXTs and to explain their unusually low average X-ray luminosity. We present the Swift observations of an exceptionally bright outburst displayed by the SFXT IGR J17544-2619 on 2014 October 10 when the source achieved a peak luminosity of 3x1038erg/s. This extends the total source dynamic range to >106, the largest (by a factor of 10) recorded so far from an SFXT. Tentative evidence for pulsations at a period of 11.6s is also reported. We show that these observations challenge, for the first time, the maximum theoretical luminosity achievable by an SFXT and propose that this giant outburst was due to the formation of a transient accretion disc around the compact object.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - X-rays: individuals: IGR J17544-2619 - accretion, accretion disks

Simbad objects: 4

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2021.03.07-18:51:54

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