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THE XMM-Newton and integral observations of the Supergiant Fast X-Ray Transient IGR J16328-4726

THE XMM-Newton and integral observations of the Supergiant Fast X-Ray Transient IGR J16328-4726
THE XMM-Newton and integral observations of the Supergiant Fast X-Ray Transient IGR J16328-4726
The accretion mechanism producing the short flares observed from the Supergiant Fast X-ray Transients (SFXT) is still highly debated and forms a major part in our attempts to place these X-ray binaries in the wider context of the High Mass X-ray Binaries. We report on a 216 ks INTEGRAL observation of the SFXT IGR J16328-4726 (2014 August 24–27) simultaneous with two fixed-time observations with XMM-Newton (33 and 20 ks) performed around the putative periastron passage, in order to investigate the accretion regime and the wind properties during this orbital phase. During these observations, the source has shown luminosity variations, from $\sim 4\times {10}^{34}$ to $\sim {10}^{36}\,\mathrm{erg}\,{{\rm{s}}}^{-1}$, linked to spectral properties changes. The soft X-ray continuum is well modeled by a power law with a photon index varying from ~1.2 up to ~1.7 and with high values of the column density in the range of $\sim 2\mbox{--}4\times {10}^{23}\,{\mathrm{cm}}^{-2}$. We report on the presence of iron lines at ~6.8–7.1 keV, suggesting that the X-ray flux is produced by the accretion of matter from the companion wind characterized by density and temperature inhomogeneities.
1538-4357
1-7
Fiocchi, M.
74d63e71-f43d-494b-92ee-07dc83d18de1
Bazzano, A.
6895fd67-4936-4d13-b934-d34a1ff9fedb
Natalucci, L.
1a93c54f-3598-4523-9b3f-2871ad23af5f
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1
Bird, A. J.
e69d3bd1-3dbd-461b-92dd-1704b5dc1b8b
Boon, C.M.
fc58cc65-37e1-41e5-9df9-99b1511d4aa3
Persi, P.
83ba611f-4f46-43a7-b9bd-4987daa692dd
Piro, L.
1f92b567-dd97-4365-8a63-a39b8a437b40
Fiocchi, M.
74d63e71-f43d-494b-92ee-07dc83d18de1
Bazzano, A.
6895fd67-4936-4d13-b934-d34a1ff9fedb
Natalucci, L.
1a93c54f-3598-4523-9b3f-2871ad23af5f
Ubertini, P.
7035748e-152c-473e-8766-a2fa3ac49fcb
Sguera, V.
371bb568-7e56-496e-a624-dba6de79d9e1
Bird, A. J.
e69d3bd1-3dbd-461b-92dd-1704b5dc1b8b
Boon, C.M.
fc58cc65-37e1-41e5-9df9-99b1511d4aa3
Persi, P.
83ba611f-4f46-43a7-b9bd-4987daa692dd
Piro, L.
1f92b567-dd97-4365-8a63-a39b8a437b40

Fiocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Sguera, V., Bird, A. J., Boon, C.M., Persi, P. and Piro, L. (2016) THE XMM-Newton and integral observations of the Supergiant Fast X-Ray Transient IGR J16328-4726. The Astrophysical Journal, 829 (125), 1-7. (doi:10.3847/0004-637X/829/2/125).

Record type: Article

Abstract

The accretion mechanism producing the short flares observed from the Supergiant Fast X-ray Transients (SFXT) is still highly debated and forms a major part in our attempts to place these X-ray binaries in the wider context of the High Mass X-ray Binaries. We report on a 216 ks INTEGRAL observation of the SFXT IGR J16328-4726 (2014 August 24–27) simultaneous with two fixed-time observations with XMM-Newton (33 and 20 ks) performed around the putative periastron passage, in order to investigate the accretion regime and the wind properties during this orbital phase. During these observations, the source has shown luminosity variations, from $\sim 4\times {10}^{34}$ to $\sim {10}^{36}\,\mathrm{erg}\,{{\rm{s}}}^{-1}$, linked to spectral properties changes. The soft X-ray continuum is well modeled by a power law with a photon index varying from ~1.2 up to ~1.7 and with high values of the column density in the range of $\sim 2\mbox{--}4\times {10}^{23}\,{\mathrm{cm}}^{-2}$. We report on the presence of iron lines at ~6.8–7.1 keV, suggesting that the X-ray flux is produced by the accretion of matter from the companion wind characterized by density and temperature inhomogeneities.

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Accepted/In Press date: 12 July 2016
e-pub ahead of print date: 29 September 2016
Published date: 1 October 2016
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 404296
URI: http://eprints.soton.ac.uk/id/eprint/404296
ISSN: 1538-4357
PURE UUID: 73e7235a-7562-4eb2-9bb4-e6d2cfb4186b
ORCID for C.M. Boon: ORCID iD orcid.org/0000-0002-9566-7873

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Date deposited: 05 Jan 2017 13:57
Last modified: 28 Oct 2019 19:42

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