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NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar

NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar
NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar

We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4 M and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuSTAR, swift and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of ∼0.7 keV by electrons heated to 21 keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron Kα complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.

Accretion, Accretion disks, Pulsars: general, Stars: low-mass, Stars: neutron, X-rays: binaries
0004-6361
Sanna, A.
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Ferrigno, C.
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Ray, P. S.
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Ducci, L.
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Jaisawal, G. K.
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Enoto, T.
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Bozzo, E.
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Altamirano, D.
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Di Salvo, T.
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Strohmayer, T. E.
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Papitto, A.
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Riggio, A.
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Burderi, L.
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Bult, P. M.
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Bogdanov, S.
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Gambino, A. F.
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Marino, A.
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Iaria, R.
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Arzoumanian, Z.
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Chakrabarty, D.
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Gendreau, K. C.
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Guillot, S.
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Markwardt, C.
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Wolff, M. T.
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Sanna, A.
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Ferrigno, C.
8e2a80ff-92fa-4c72-bb28-787213fbef72
Ray, P. S.
773c1940-2b53-4871-8176-c363521bb83f
Ducci, L.
d0086aca-873b-4810-ae66-06858cefd1f8
Jaisawal, G. K.
4d5dcd39-0881-426d-8ad7-f378238405ae
Enoto, T.
c5c94b63-52c8-4fd2-bd9e-260a84fff52c
Bozzo, E.
d13c9129-4c32-4a4a-85cb-81035d7b2824
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Di Salvo, T.
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Strohmayer, T. E.
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Papitto, A.
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Riggio, A.
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Burderi, L.
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Bult, P. M.
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Bogdanov, S.
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Gambino, A. F.
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Marino, A.
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Iaria, R.
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Arzoumanian, Z.
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Chakrabarty, D.
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Gendreau, K. C.
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Guillot, S.
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Markwardt, C.
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Wolff, M. T.
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Sanna, A., Ferrigno, C., Ray, P. S., Ducci, L., Jaisawal, G. K., Enoto, T., Bozzo, E., Altamirano, D., Di Salvo, T., Strohmayer, T. E., Papitto, A., Riggio, A., Burderi, L., Bult, P. M., Bogdanov, S., Gambino, A. F., Marino, A., Iaria, R., Arzoumanian, Z., Chakrabarty, D., Gendreau, K. C., Guillot, S., Markwardt, C. and Wolff, M. T. (2018) NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar. Astronomy and Astrophysics, 617, [L8]. (doi:10.1051/0004-6361/201834160).

Record type: Letter

Abstract

We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4 M and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuSTAR, swift and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of ∼0.7 keV by electrons heated to 21 keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron Kα complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.

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More information

Accepted/In Press date: 10 September 2018
e-pub ahead of print date: 1 October 2018
Keywords: Accretion, Accretion disks, Pulsars: general, Stars: low-mass, Stars: neutron, X-rays: binaries

Identifiers

Local EPrints ID: 427373
URI: http://eprints.soton.ac.uk/id/eprint/427373
ISSN: 0004-6361
PURE UUID: aa3e5a08-3cf4-4344-a231-019f9f3a4d6a
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

Catalogue record

Date deposited: 14 Jan 2019 17:30
Last modified: 26 Nov 2021 03:02

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Contributors

Author: A. Sanna
Author: C. Ferrigno
Author: P. S. Ray
Author: L. Ducci
Author: G. K. Jaisawal
Author: T. Enoto
Author: E. Bozzo
Author: D. Altamirano ORCID iD
Author: T. Di Salvo
Author: T. E. Strohmayer
Author: A. Papitto
Author: A. Riggio
Author: L. Burderi
Author: P. M. Bult
Author: S. Bogdanov
Author: A. F. Gambino
Author: A. Marino
Author: R. Iaria
Author: Z. Arzoumanian
Author: D. Chakrabarty
Author: K. C. Gendreau
Author: S. Guillot
Author: C. Markwardt
Author: M. T. Wolff

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