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

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

doi:10.1051/0004-6361/201732262

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

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

Physics

Research output: Contribution to journal › Article

12 Scopus citations

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.

Original language	English
Article number	L2
Journal	Astronomy and Astrophysics
Volume	610
DOIs	https://doi.org/10.1051/0004-6361/201732262
State	Published - Feb 1 2018

Keywords

Accretion, accretion disks
Binaries: general
Stars: neutron
X-rays: binaries

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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., & Burderi, L. (2018). Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704. Astronomy and Astrophysics, 610, [L2]. https://doi.org/10.1051/0004-6361/201732262

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. ; Burderi, L. / Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704. In: Astronomy and Astrophysics. 2018 ; Vol. 610.

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title = "Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704",

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.",

keywords = "Accretion, accretion disks, Binaries: general, Stars: neutron, X-rays: binaries",

author = "A. Sanna and A. Bahramian and E. Bozzo and C. Heinke and D. Altamirano and R. Wijnands and N. Degenaar and T. Maccarone and A. Riggio and {Di Salvo}, T. and R. Iaria and M. Burgay and A. Possenti and C. Ferrigno and A. Papitto and Sivakoff, {G. R.} and N. D'Amico and L. Burderi",

year = "2018",

month = feb,

day = "1",

doi = "10.1051/0004-6361/201732262",

language = "English",

volume = "610",

journal = "Astronomy and Astrophysics",

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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, GR, D'Amico, N & Burderi, L 2018, 'Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704', Astronomy and Astrophysics, vol. 610, L2. https://doi.org/10.1051/0004-6361/201732262

Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704. / 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.; Burderi, L.

In: Astronomy and Astrophysics, Vol. 610, L2, 01.02.2018.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704

AU - Sanna, A.

AU - Bahramian, A.

AU - Bozzo, E.

AU - Heinke, C.

AU - Altamirano, D.

AU - Wijnands, R.

AU - Degenaar, N.

AU - Maccarone, T.

AU - Riggio, A.

AU - Di Salvo, T.

AU - Iaria, R.

AU - Burgay, M.

AU - Possenti, A.

AU - Ferrigno, C.

AU - Papitto, A.

AU - Sivakoff, G. R.

AU - D'Amico, N.

AU - Burderi, L.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - 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.

AB - 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.

KW - Accretion, accretion disks

KW - Binaries: general

KW - Stars: neutron

KW - X-rays: binaries

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DO - 10.1051/0004-6361/201732262

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