X-ray variability of 104 active galactic nuclei

Bibcode
2013IAUS..290...37G
DOI
10.1017/S1743921312019151
Vaughan, S.; González-Martín, O.
Referencia bibliográfica

Feeding Compact Objects: Accretion on All Scales, Proceedings of the International Astronomical Union, IAU Symposium, Volume 290, pp. 37-40

Fecha de publicación:
2
2013
Número de autores
2
Número de autores del IAC
1
Número de citas
1
Número de citas referidas
0
Descripción
We have performed a uniform analysis of the power spectrum densities (PSDs) of 104 nearby (z<0.4) active galactic nuclei (AGN) using 209 XMM-Newton/pn observations, including several AGN classes. These PSDs span ~= 3 decades in temporal frequencies, ranging from minutes to days. We have fitted each PSD to two models: (1) a single power-law model and (2) a bending power-law model. A fraction of 72% show significant variability. The PSD of the majority of the variable AGN was well described by a simple power-law with a mean index of α = 2.01+/-0.01. In 15 sources we found that the bending power law model was preferred with a mean slope of α = 3.08+/-0.04 and a mean bend frequency of <ν b > ~= 2 × 10-4 Hz. Only KUG 1031+398 (RE J1034+396) shows evidence for quasi-periodic oscillations. The `fundamental plane' relating variability timescale, black hole mass, and luminosity is demonstrated using the new X-ray timing results presented here together with a compilation of the previously detected timescales from the literature.
Tipo
Sin árbitro
Acreción
Galaxias
Galaxias

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