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Chasing candidate supergiant fast X-ray transients in the 1,000 orbits INTEGRAL/IBIS catalog

Chasing candidate supergiant fast X-ray transients in the 1,000 orbits INTEGRAL/IBIS catalog
Chasing candidate supergiant fast X-ray transients in the 1,000 orbits INTEGRAL/IBIS catalog
We report results from an investigation at hard X-rays (above 18 keV) and soft X-rays (below 10 keV) of a sample of X-ray transients located on the Galactic plane and detected with the bursticity method, as reported in the latest 1,000 orbits INTEGRAL/IBIS catalog. Our main aim has been to individuate those with X-rays characteristics strongly resembling Supergiant Fast X-ray Transients (SFXTs). As a result, we found four unidentified fast X-ray transients which now can be considered good SFXT candidates. In particular, three transients (IGR J16374−5043, IGR J17375−3022 and IGR J12341−6143) were very poorly studied in the literature before the current work, and our findings largely improved the knowledge of their X-ray characteristics. The other transient (XTE J1829−098) was previously studied in detail only below 10 keV, conversely the current work provides the first detailed study in outburst above 18 keV. In addition we used archival infrared observations of the transients to pinpoint, among the field objects, their best candidate counterpart. We found that their photometric properties are compatible with an early type spectral classification, further supporting our proposed nature of SFXTs. Infrared spectroscopy is advised to confirm or disprove our interpretation. The reported findings allowed a significant increase of the sample of candidate SFXTs known to date, effectively doubling their number.
0035-8711
Sguera, V.
aa109b47-f142-4235-8747-1d5215cb8eb4
Sidoli, L.
8fb3495e-d8f0-4d0c-a806-cbe6f44ca7e0
Bird, Antony
045ee141-4720-46fd-a412-5aa848a91b32
Paizis, A.
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Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Sguera, V.
aa109b47-f142-4235-8747-1d5215cb8eb4
Sidoli, L.
8fb3495e-d8f0-4d0c-a806-cbe6f44ca7e0
Bird, Antony
045ee141-4720-46fd-a412-5aa848a91b32
Paizis, A.
6a0debba-8cce-479e-bfcb-569b72903391
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d

Sguera, V., Sidoli, L., Bird, Antony, Paizis, A. and Bazzano, A. (2019) Chasing candidate supergiant fast X-ray transients in the 1,000 orbits INTEGRAL/IBIS catalog. Monthly Notices of the Royal Astronomical Society. (doi:10.1093/mnras/stz3330). (In Press)

Record type: Article

Abstract

We report results from an investigation at hard X-rays (above 18 keV) and soft X-rays (below 10 keV) of a sample of X-ray transients located on the Galactic plane and detected with the bursticity method, as reported in the latest 1,000 orbits INTEGRAL/IBIS catalog. Our main aim has been to individuate those with X-rays characteristics strongly resembling Supergiant Fast X-ray Transients (SFXTs). As a result, we found four unidentified fast X-ray transients which now can be considered good SFXT candidates. In particular, three transients (IGR J16374−5043, IGR J17375−3022 and IGR J12341−6143) were very poorly studied in the literature before the current work, and our findings largely improved the knowledge of their X-ray characteristics. The other transient (XTE J1829−098) was previously studied in detail only below 10 keV, conversely the current work provides the first detailed study in outburst above 18 keV. In addition we used archival infrared observations of the transients to pinpoint, among the field objects, their best candidate counterpart. We found that their photometric properties are compatible with an early type spectral classification, further supporting our proposed nature of SFXTs. Infrared spectroscopy is advised to confirm or disprove our interpretation. The reported findings allowed a significant increase of the sample of candidate SFXTs known to date, effectively doubling their number.

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Chasing candidate Supergiant Fast X-ray Transients in the 1,000 orbits INTEGRAL IBIS catalog - Accepted Manuscript
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Accepted/In Press date: 21 November 2019

Identifiers

Local EPrints ID: 436194
URI: http://eprints.soton.ac.uk/id/eprint/436194
ISSN: 0035-8711
PURE UUID: 67d51765-0f4c-4701-9164-d1c00b835b3b
ORCID for Antony Bird: ORCID iD orcid.org/0000-0002-6888-8937

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Date deposited: 03 Dec 2019 17:30
Last modified: 22 Nov 2021 02:36

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Contributors

Author: V. Sguera
Author: L. Sidoli
Author: Antony Bird ORCID iD
Author: A. Paizis
Author: A. Bazzano

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