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IGR J170626143 is an Accreting Millisecond X-Ray PulsarWe 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 4.3sigma 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 approx. =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.
Document ID
20170002026
Document Type
Reprint (Version printed in journal)
Authors
Strohmayer, Tod E. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Keek, Laurens (Maryland Univ. College Park, MD, United States)
Date Acquired
March 7, 2017
Publication Date
February 17, 2017
Publication Information
Publication: The Astrophysical Journal Letters
Volume: o 836
Issue: 2
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN39622
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Other
Keywords
stars: neutron
Xray: binaries - X-rays; individual
rotation
oscillations