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

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Sebastien Guillot Jeroen Homan Gaurava K. Jaisawal Frederick K. Lamb Renee M. Ludlam Simin Mahmoodifar Craig Markwardt Takashi Okajima Sam Price Tod E. Strohmayer Luke Winternitz

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classification 🌌 astro-ph.HE

keywords niceramplitudekilohertzoscillationquasi-periodicx-rayanalyzingapproximately

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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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NICER Detects a Soft X-ray Kilohertz Quasi-periodic Oscillation in 4U 0614+09

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