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Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704
- Source :
- A&A 610, L2 (2018)
- Publication Year :
- 2017
-
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 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 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 searched for with the Parkes observatory and not detected.<br />Comment: 4 pages, 4 images, Accepted for publication in A&A
- Subjects :
- Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Database :
- arXiv
- Journal :
- A&A 610, L2 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1711.03092
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1051/0004-6361/201732262