NICER Detects a Soft X-ray Kilohertz Quasi-periodic Oscillation in 4U 0614+09
Peter Bult, Diego Altamirano, Zaven Arzoumanian, Edward M. Cackett,, Deepto Chakrabarty, John Doty, Teruaki Enoto, Keith C. Gendreau, Sebastien, Guillot, Jeroen Homan, Gaurava K. Jaisawal, Frederick K. Lamb, Renee M., Ludlam, Simin Mahmoodifar, Craig Markwardt, Takashi Okajima
TL;DR
This paper reports the first detection of a kilohertz QPO in 4U 0614+09 using NICER, revealing energy-dependent properties and providing insights into the emission mechanisms near neutron stars.
Contribution
First detection of a kHz QPO in 4U 0614+09 with NICER, including energy dependence and amplitude measurements below 2 keV.
Findings
Detected kHz QPO with frequencies 400-750 Hz
Measured QPO amplitude below 2 keV for the first time
Discussed implications for Comptonization emission models
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.
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