IGR J17062-6143 Is an Accreting Millisecond X-Ray Pulsar

We present the discovery of 163.65 Hz X-ray pulsations from IGR J17062−6143 in the only observation obtained from the source with the Rossi X-ray Timing Explorer. This detection makes IGR J17062−6143 the lowest-frequency accreting millisecond X-ray pulsar presently known. The pulsations are detected...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2017-02, Vol.836 (2), p.L23-L23
Main Authors: Strohmayer, Tod, Keek, Laurens
Format: Article
Language:English
Subjects:
Accretion
AMPLITUDES
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Circular orbits
DETECTION
Intervals
KEV RANGE
MASS
NEUTRON STARS
ORBITS
OSCILLATIONS
PULSARS
Pulsation
PULSATIONS
ROTATION
stars: neutron
stars: oscillations
stars: rotation
Time measurements
X RADIATION
X rays
X-rays: binaries
X-rays: individual (IGR J17062-6143)
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Summary:We present the discovery of 163.65 Hz X-ray pulsations from IGR J17062−6143 in the only observation obtained from the source with the Rossi X-ray Timing Explorer. This detection makes IGR J17062−6143 the lowest-frequency accreting millisecond X-ray pulsar presently known. The pulsations are detected in the 2-12 keV band with an overall significance of 4.3 and an observed pulsed amplitude of 5.54% 0.67% (in this band). Both dynamic power spectral and coherent phase timing analysis indicate that the pulsation frequency is decreasing during the 1.2 ks observation in a manner consistent with orbital motion of the neutron star. Because the observation interval is short, we cannot precisely measure the orbital period; however, periods shorter than 17 minutes are excluded at 90% confidence. For the range of acceptable circular orbits the inferred binary mass function substantially overlaps the observed range for the AMXP population as a whole.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/aa5e51