NICER Detects a Soft X-ray Kilohertz Quasi-periodic Oscillation in 4U 0614+09
arXiv:1805.11906 · doi:10.3847/2041-8213/aac893
Abstract
We report on the detection of a kilohertz quasi-periodic oscillation (QPO) with the Neutron Star Interior Composition Explorer (NICER). Analyzing approximately 165 ks of NICER exposure on the X-ray burster 4U 0614+09, we detect multiple instances of a single-peak upper kHz QPO, with centroid frequencies that range from 400 Hz to 750 Hz. We resolve the kHz QPO as a function of energy, and measure, for the first time, the QPO amplitude below 2 keV. We find the fractional amplitude at 1 keV is on the order of 2% rms, and discuss the implications for the QPO emission process in the context of Comptonization models.
arXiv commentproof correction applied. 7 pages, 3 figures, 1 table, accepted for publication in ApJ Letters
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- Simultaneous NICER and NuSTAR Observations of the Ultra-compact X-ray Binary 4U 1543-624
- NICER observations of the black hole candidate MAXI J0637430 during the 2019-2020 Outburst
- A Comprehensive Study of Thermonuclear X-ray Bursts from 4U 1820-30 with NICER: Accretion Disk Interactions and a Candidate Burst Oscillation
- Type I X-ray bursts' spectra and fuel composition from the atoll and transient source 4U 173022
- Observations of the Ultra-compact X-ray Binary 4U 1543-624 in Outburst with NICER, INTEGRAL, Swift, and ATCA
- XMM-Newton and NICER measurement of the rms spectrum of the millihertz quasi-periodic oscillations in the neutron-star low-mass X-ray binary 4U 1636-53
- Phase resolved spectrum of the Crab pulsar from NICER
- Observational constraints on the magnetic field of the bright transient Be/X-ray pulsar SXP 4.78
- Discovery and Identification of MAXI J1621-501 as a Type I X-ray Burster with a Super-Orbital Period