0000000001075514

AUTHOR

Gregory R. Sivakoff

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

2018

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 implying an orbital period of ~46 minutes and a projected semi-major axis of ~5 lt-ms, which makes IGR J16597-3704 an ultra-compact X-ray binary system. We estimated a minimum companion mass of 0.0065 solar masses, assuming a neutron star mass of 1.4 solar masses, and an inclination angle of <75 degrees (suggested by the absence of eclipses or dips in its light-curve). The broad-band energy spectrum of the…

PhotonAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencessymbols.namesakeAccretion accretion diskSettore FIS/05 - Astronomia E Astrofisica0103 physical sciencesBinaries: generalAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Accretion (meteorology)010308 nuclear & particles physicsgeneral; Stars: neutron; X-rays: binaries; Astronomy and Astrophysics; Space and Planetary Science [Accretion accretion disks; Binaries]Astronomy and AstrophysicsAstronomy and AstrophysicLight curveOrbital periodX-rays: binarieStars: neutronNeutron starSpace and Planetary ScienceGlobular clustersymbolsElectron temperatureAstrophysics - High Energy Astrophysical PhenomenaDoppler effect
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