72 citations · 265 across the 9 of their papers we have counts for
9 papers
QPO in RE J1034+396: model constraints from observed trends
B. Czerny, P. Lachowicz, M. Dovciak +3
We analyze the time variability of the X-ray emission of RE J1034+396, an active galactic nucleus with the first firm detection of a quasi-periodic oscillations (QPO). Based on the…
Quasi-Periodic Pulsations in Solar Flares: new clues from the Fermi Gamma-Ray Burst Monitor
D. Gruber, P. Lachowicz, E. Bissaldi +14
In the last four decades it has been observed that solar flares show quasi-periodic pulsations (QPPs) from the lowest, i.e. radio, to the highest, i.e. gamma-ray, part of the elect…
The model constraints from the observed trends for the quasi-periodic oscillation in RE J1034+396
B. Czerny, P. Lachowicz, M. Dovciak +3
We analyze the time variability of the X-ray emission of RE J1034+396 -- an active galactic nucleus with the first firm detection of a quasi-periodic oscillations (QPO). Based on t…
Detection of Intra-day Variability Timescales of Four High Energy Peaked Blazars with XMM-Newton
Haritma Gaur, Alok C. Gupta, Pawel Lachowicz +1
We selected a sample of 24 XMM-Newton light curves (LCs) of four high energy peaked blazars, PKS 0548-322, ON 231, 1ES 1426+428 and PKS 2155-304. These data comprise continuous lig…
Quasi-periodic oscillations under wavelet microscope: the application of Matching Pursuit algorithm
Pawel Lachowicz, Chris Done
We zoom in on the internal structure of the low-frequency quasi-periodic oscillation (LF QPO) often observed in black hole binary systems to investigate the physical nature of the…
Wavelet analysis: a new significance test for signals dominated by intrinsic red-noise variability
Pawel Lachowicz
We develop a new statistical test for the wavelet power spectrum. We design it with purpose of testing signals which intrinsic variability displays in a Fourier domain a red-noise…