A repeating X-ray signal with a period of about 28 minutes is claimed in two independent observations of NGC 4151, with uncorrected combined significance 5.2 sigma that falls to 3.2 sigma under the paper's strictest trial correction.
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Detection and Characterization of Quasi-Periodic Oscillations in Seyfert Galaxy NGC 4151
A repeating X-ray signal with a period of about 28 minutes is claimed in two independent observations of NGC 4151, with uncorrected combined significance 5.2 sigma that falls to 3.2 sigma under the paper's strictest trial correction.