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Unveiling supergiant fast x-ray transient sources with INTEGRAL

Unveiling supergiant fast x-ray transient sources with INTEGRAL
Unveiling supergiant fast x-ray transient sources with INTEGRAL
Supergiant high-mass X-ray binaries (SGXBs) are believed to be rare objects, as stars in the supergiant phase have a very short lifetime and to date only about a dozen of them have been discovered. They are known to be persistent and bright X-ray sources. INTEGRAL is changing this classical picture, as its observations are revealing the presence of a new subclass of SGXBs that have been labeled supergiant fast X-ray transients (SFXTs), since they are strongly characterized by fast X-ray outbursts lasting less than a day, typically a few hours. We report on IBIS detections of newly discovered fast X-ray outbursts from 10 sources, four of which have been recently optically identified as supergiant high-mass X-ray binaries. For one of them in particular, IGR J112155952, we observe fast X-ray transient behavior for the first time. The remaining six sources ( IGR J164794514, IGR J164184532, IGR J16195 4945=AX J1619294945, XTE J1743363, AX J1749.12733, and IGR J174072808) are still unclassified; however, they can be considered candidate SFXTs because of their similarity to the known SFXTs.
gamma rays, observations
0004-637X
452-463
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Barlow, E.J.
5e205303-63c9-4d5f-a092-ba99dc129c4c
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
Clark, D.J.
4d37cdbe-d8f5-47c6-a135-7950843def36
Hill, A.B.
b7eb0ab0-8912-42e1-823d-640071123280
Malizia, M.
f0f695d6-5e3c-4e69-8f27-aaa3765c7e39
Molina, M.
28a3f3b6-aedf-4fa5-9a4f-dbcba001435d
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Barlow, E.J.
5e205303-63c9-4d5f-a092-ba99dc129c4c
Bassani, L.
07e5602c-f97e-4334-a0fa-c2212431a61a
Clark, D.J.
4d37cdbe-d8f5-47c6-a135-7950843def36
Hill, A.B.
b7eb0ab0-8912-42e1-823d-640071123280
Malizia, M.
f0f695d6-5e3c-4e69-8f27-aaa3765c7e39
Molina, M.
28a3f3b6-aedf-4fa5-9a4f-dbcba001435d
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a

Sguera, V., Bazzano, A., Bird, A.J., Dean, A.J., Ubertini, P., Barlow, E.J., Bassani, L., Clark, D.J., Hill, A.B., Malizia, M., Molina, M. and Stephen, J.B. (2006) Unveiling supergiant fast x-ray transient sources with INTEGRAL. Astrophysical Journal, 646 (1), 452-463. (doi:10.1086/504827).

Record type: Article

Abstract

Supergiant high-mass X-ray binaries (SGXBs) are believed to be rare objects, as stars in the supergiant phase have a very short lifetime and to date only about a dozen of them have been discovered. They are known to be persistent and bright X-ray sources. INTEGRAL is changing this classical picture, as its observations are revealing the presence of a new subclass of SGXBs that have been labeled supergiant fast X-ray transients (SFXTs), since they are strongly characterized by fast X-ray outbursts lasting less than a day, typically a few hours. We report on IBIS detections of newly discovered fast X-ray outbursts from 10 sources, four of which have been recently optically identified as supergiant high-mass X-ray binaries. For one of them in particular, IGR J112155952, we observe fast X-ray transient behavior for the first time. The remaining six sources ( IGR J164794514, IGR J164184532, IGR J16195 4945=AX J1619294945, XTE J1743363, AX J1749.12733, and IGR J174072808) are still unclassified; however, they can be considered candidate SFXTs because of their similarity to the known SFXTs.

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More information

Published date: 20 July 2006
Additional Information: AJD was the originator of the concept to exploit INTEGRAL to survey the Galactic plane on a regular basis. The survey has discovered many transient events. This paper, led by my research student, provides a milestone synopsis of the situation relating to this new and not completely understood phenomenon.
Keywords: gamma rays, observations

Identifiers

Local EPrints ID: 45356
URI: http://eprints.soton.ac.uk/id/eprint/45356
ISSN: 0004-637X
PURE UUID: 3bdaf0b3-699e-4eb2-988f-86b500c0efa0
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

Catalogue record

Date deposited: 21 Mar 2007
Last modified: 26 Nov 2021 02:36

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Contributors

Author: V. Sguera
Author: A. Bazzano
Author: A.J. Bird ORCID iD
Author: A.J. Dean
Author: P. Ubertini
Author: E.J. Barlow
Author: L. Bassani
Author: D.J. Clark
Author: A.B. Hill
Author: M. Malizia
Author: M. Molina
Author: J.B. Stephen

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