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pro vyhledávání: '"Pechacek, T."'
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Autor:
Epitropakis, A., Papadakis, I. E., Dovčiak, M., Pecháček, T., Emmanoulopoulos, D., Karas, V., McHardy, I. M.
Publikováno v:
A&A 594, A71 (2016)
Context: Theoretical modelling of time-lags between variations in the Fe K$\alpha$ emission and the X-ray continuum might shed light on the physics and geometry of the X-ray emitting region in active galaxies (AGN) and X-ray binaries. We here present
Externí odkaz:
http://arxiv.org/abs/1607.02625
Autor:
Emmanoulopoulos, D., Papadakis, I. E., Epitropakis, A., Pecháček, T., Dovčiak, M., McHardy, I. M.
We present the results of a detailed study of the X-ray power spectra density (PSD) functions of twelve X-ray bright AGN, using almost all the archival XMM-Newton data. The total net exposure of the EPIC-pn light curves is larger than 350 ks in all c
Externí odkaz:
http://arxiv.org/abs/1606.00844
We compute fully relativistic disc response functions in the case of the "lamp-post" geometry using the full observed reflection spectrum for various X-ray source heights, disc inclination, and spin values of the central black hole. Since the observe
Externí odkaz:
http://arxiv.org/abs/1601.02860
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 results of a wavelet analysis, we find a drift in the QPO central fre
Externí odkaz:
http://arxiv.org/abs/1202.2087
Autor:
Trzesniewski, T., Czerny, B., Karas, V., Pechacek, T., Dovciak, M., Goosmann, R., Nikolajuk, M.
Publikováno v:
Astronomy and Astrophysics, vol. 530, A136 (2011)
We study the variability mechanism of active galactic nuclei (AGN) within the framework of the flare model. To this end we examine the case of Seyfert/LINER galaxy NGC 4258, which is observed at high inclination angle and exhibits rapid fluctuations
Externí odkaz:
http://arxiv.org/abs/1104.4181
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 results of a wavelet analysis, we find a drift in the QPO central f
Externí odkaz:
http://arxiv.org/abs/1009.3126
Publikováno v:
Astronomy and Astrophysics 487 (2008) 815-830
Theory of random processes provides an attractive mathematical tool to describe the fluctuating signal from accreting sources, such as active galactic nuclei and Galactic black holes observed in X-rays. These objects exhibit featureless variability o
Externí odkaz:
http://arxiv.org/abs/0807.0224
Autor:
Pechacek, T., Karas, V.
Hot spots residing on the surface of an accretion disc have been considered as a model of short-term variability of active galactic nuclei. In this paper we apply the theory of random point processes to model the observed signal from an ensemble of r
Externí odkaz:
http://arxiv.org/abs/0711.4772
Publikováno v:
Astron.Astrophys. 441 (2005) 855-861
Transient spectral features have been discovered in the X-ray spectra of Active Galactic Nuclei, mostly in the 5--7 keV energy range. Several interpretations were proposed for the origin of these features. We examined a model of Doppler boosted blue
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507196