Abstract
A possible quasi-periodic oscillation (QPO) at frequency $7.045\times10^{-5}$ Hz is found in the narrow-line seyfert 1 (NLS1) galaxy Mrk 142 in the data of XMM-Newton collected on 2020 April 11. We obtain that the QPO signal is statistically significant larger than the $5\sigma$ level and highly coherent with quality factor $Q > 5$ at the 0.3-10 keV band by using the method of the Lomb-Scargle Periodogram (LSP), the Weighted Wavelet Z-transform (WWZ) and the REDFIT. We analyse the data in 0.3-0.6 keV, 0.6-1 keV, 1-3 keV and 3-10 keV energy bands, and find obvious QPO signals at 0.3-0.6 keV and 1-3 keV bands. We then analyze the time-average spectra and time variability at the QPO frequency of $7.045\times10^{-5}$ Hz, and use a model to fit them. We find that the QPO signal mainly comes from the X-ray hot corona.
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