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Long Term X-Ray Spectral Variations of the Seyfert-1 Galaxy Mrk 279

Jeena, K.; Misra, Ranjeev; Akhila, K. +1 more

We present the results from a long term X-ray analysis of Mrk 279 during the period 2018–2020. We use data from multiple missions – AstroSat, NuSTAR and XMM-Newton, for the purpose. The X-ray spectrum can be modeled as a double Comptonization along with the presence of neutral Fe Kα line emission, at all epochs. We determined the source's X-ray fl…

A Possible X-ray Quasi-periodic Oscillation in the Narrow-line Seyfert 1 Galaxy Mrk 142

Zhong, Xiao-Gu; Wang, Jian-Cheng; Chen, Yong-Yun +1 more

A possible quasi-periodic oscillation (QPO) at frequency 7.045 × 10^‑5 Hz is found in the narrow-line Seyfert 1 galaxy Mrk 142 in the data of XMM-Newton collected on 2020 April 11. We find that the QPO signal is statistically significantly larger than the 5σ level and highly coherent with quality factor Q > 5 at the 0.3–10 keV band by…