SIMBAD references

2018A&A...610L...2S - Astronomy and Astrophysics, volume 610, L2-2 (2018/2-1)

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. and BURDERI L.

Abstract (from CDS):

We report the discovery of X-ray pulsations at 105.2Hz (9.5ms) 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 9.1kpc. The X-ray pulsations show a clear Doppler modulation that implies an orbital period of ∼46min and a projected semi-major axis of ∼5lt-ms, which makes IGR J16597-3704 an ultracompact X-ray binary system. We estimated a minimum companion mass of 6.5x10–10M, assuming a neutron star mass of 1.4M, 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∼1.4keV) plus a comptonised power-law with photon index ∼2.3 and an electron temperature of ∼30keV. Radio pulsations from the source were unsuccessfully searched for with the Parkes Observatory.

Abstract Copyright: © ESO, 2018

Journal keyword(s): binaries: general - stars: neutron - X-rays: binaries - accretion, accretion disks

Simbad objects: 3

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2020.09.19-20:14:05

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