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Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704

Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704
Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704

We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597-3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in the globular cluster NGC 6256 at a distance of 9.1 kpc. The X-ray pulsations show a clear Doppler modulation that implies an orbital period of ∼46 min and a projected semi-major axis of ∼5 lt-ms, which makes IGR J16597-3704 an ultracompact X-ray binary system. We estimated a minimum companion mass of 6.5 × 10-10 M, assuming a neutron star mass of 1.4 M, and an inclination angle of <75° (suggested by the absence of eclipses or dips in its light curve). The broad-band energy spectrum of the source is well described by a disk blackbody component (kT ∼ 1.4 keV) plus a comptonised power-law with photon index ∼2.3 and an electron temperature of ∼30 keV. Radio pulsations from the source were unsuccessfully searched for with the Parkes Observatory.

Accretion, accretion disks, Binaries: general, Stars: neutron, X-rays: binaries
0004-6361
1-4
Sanna, A.
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Bahramian, A.
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Bozzo, E.
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Heinke, C.
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Altamirano, D.
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Wijnands, R.
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Degenaar, N.
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Maccarone, T.
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Riggio, A.
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Di Salvo, T.
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Iaria, R.
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Burgay, M.
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Possenti, A.
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Ferrigno, C.
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Papitto, A.
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Sivakoff, G.R.
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D'Amico, N.
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Burderi, L.
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Sanna, A.
b925b305-171b-461f-bbf7-1c8fe246293c
Bahramian, A.
1f016b89-98b9-4fa9-8df0-9390fbb5eeda
Bozzo, E.
d13c9129-4c32-4a4a-85cb-81035d7b2824
Heinke, C.
f46b0379-2882-4b02-a633-476ad9f148ad
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Wijnands, R.
382893ee-0e03-45e3-9321-db8b9fc74914
Degenaar, N.
54149051-d74e-4e43-a7cd-501ec4023511
Maccarone, T.
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Riggio, A.
524a76c7-0879-4353-9a3e-7a0e092e40c1
Di Salvo, T.
306153a8-618d-4449-87df-0acb541e59da
Iaria, R.
a6eda3b5-1a76-4e20-83ab-2b9d72d751e2
Burgay, M.
2126e0d6-b0b2-48be-a5e9-5d8204006875
Possenti, A.
88324941-3678-429b-8552-5911ab6d0207
Ferrigno, C.
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Papitto, A.
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Sivakoff, G.R.
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D'Amico, N.
83318cd9-3e01-4980-a42e-73f2951f9830
Burderi, L.
4acc12f5-46ae-458b-b783-f92ddaa2b505

Sanna, A., Bahramian, A., Bozzo, E., Heinke, C., Altamirano, D., Wijnands, R., Degenaar, N., Maccarone, T., Riggio, A., Di Salvo, T., Iaria, R., Burgay, M., Possenti, A., Ferrigno, C., Papitto, A., Sivakoff, G.R., D'Amico, N. and Burderi, L. (2018) Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704. Astronomy & Astrophysics, 610, 1-4, [L2]. (doi:10.1051/0004-6361/201732262).

Record type: Letter

Abstract

We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597-3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in the globular cluster NGC 6256 at a distance of 9.1 kpc. The X-ray pulsations show a clear Doppler modulation that implies an orbital period of ∼46 min and a projected semi-major axis of ∼5 lt-ms, which makes IGR J16597-3704 an ultracompact X-ray binary system. We estimated a minimum companion mass of 6.5 × 10-10 M, assuming a neutron star mass of 1.4 M, and an inclination angle of <75° (suggested by the absence of eclipses or dips in its light curve). The broad-band energy spectrum of the source is well described by a disk blackbody component (kT ∼ 1.4 keV) plus a comptonised power-law with photon index ∼2.3 and an electron temperature of ∼30 keV. Radio pulsations from the source were unsuccessfully searched for with the Parkes Observatory.

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Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704 - Accepted Manuscript
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Accepted/In Press date: 28 November 2017
e-pub ahead of print date: 14 February 2018
Published date: February 2018
Keywords: Accretion, accretion disks, Binaries: general, Stars: neutron, X-rays: binaries

Identifiers

Local EPrints ID: 418699
URI: http://eprints.soton.ac.uk/id/eprint/418699
ISSN: 0004-6361
PURE UUID: 2c456ef8-fa41-4c99-aa22-cc5149078b8a
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 19 Mar 2018 17:30
Last modified: 17 Dec 2019 01:35

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Contributors

Author: A. Sanna
Author: A. Bahramian
Author: E. Bozzo
Author: C. Heinke
Author: D. Altamirano ORCID iD
Author: R. Wijnands
Author: N. Degenaar
Author: T. Maccarone
Author: A. Riggio
Author: T. Di Salvo
Author: R. Iaria
Author: M. Burgay
Author: A. Possenti
Author: C. Ferrigno
Author: A. Papitto
Author: G.R. Sivakoff
Author: N. D'Amico
Author: L. Burderi

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