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
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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February 2018
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.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Riggio, A.
d2b6a7db-91ef-403f-983e-4b0e0e39cc8b
Di Salvo, T.
130aa112-d9f1-4fb5-9c19-2131ea917a0a
Iaria, R.
c2cb5d43-3bce-4efd-bb65-d7b7d13d949d
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., 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 and Astrophysics, 610, , [L2].
(doi:10.1051/0004-6361/201732262).
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.
Text
Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704
- Accepted Manuscript
More information
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
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Date deposited: 19 Mar 2018 17:30
Last modified: 18 Mar 2024 03:27
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Contributors
Author:
A. Sanna
Author:
A. Bahramian
Author:
E. Bozzo
Author:
C. Heinke
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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