463 citations · 6.1k across the 68 of their papers we have counts for
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Rapid X-ray Variability of Seyfert 1 Galaxies
S. Vaughan, A. C. Fabian, K. Iwasawa
The rapid and seemingly random fluctuations in X-ray luminosity of Seyfert galaxies provided early support for the standard model in which Seyferts are powered by a supermassive bl…
The exceptional X-ray variability of the dwarf Seyfert nucleus NGC 4395
S. Vaughan, K. Iwasawa, A. C. Fabian +1
An analysis of the X-ray variability of the low luminosity Seyfert nucleus NGC 4395, based on a long XMM-Newton observation, is presented. The power spectrum shows a clear break fr…
The narrow-line quasar NAB 0205+024 observed with XMM-Newton
L. C. Gallo, Th. Boller, W. N. Brandt +2
The XMM-Newton observation of the narrow-line quasar NAB 0205+024 reveals three striking differences since it was last observed in the X-rays with ASCA. Firstly, the 2-10 keV power…
X-ray reflection in the NLS1 1H 0707-495
A. C. Fabian, G. Miniutti, L. Gallo +4
We apply a reflection-dominated model to the second XMM-Newton observation of the Narrow Line Seyfert 1 galaxy 1H 0707-495. As in the first XMM-Newton observation a sharp spectral…
Long-term spectral changes in the partial-covering candidate NLS1 1H 0707-495
L. C. Gallo, Y. Tanaka, Th. Boller +3
We compare two XMM-Newton observations of the Narrow-Line Seyfert 1 galaxy 1H 0707-495 separated by two years, and discuss the results in terms of the partial-covering phenomenon.…
An XMM-Newton observation of Ark 120: the X-ray spectrum of a `bare' Seyfert 1 nucleus
S. Vaughan, A. C. Fabian, D. R. Ballantyne +3
We report on a long (100 ks) XMM-Newton observation of the bright Seyfert 1 galaxy Arakelian 120. The source previously showed no signs of intrinsic reddening in its infrared-ultra…