# Extreme X‐ray variability in the luminous quasar PDS 456

@article{Reeves2002ExtremeXV,
title={Extreme X‐ray variability in the luminous quasar PDS 456},
author={J. N. Reeves and Graham A. Wynn and P. T. O’Brien and Kenneth Alwyne Pounds},
journal={Monthly Notices of the Royal Astronomical Society},
year={2002},
volume={336}
}
• Published 6 September 2002
• Physics
• Monthly Notices of the Royal Astronomical Society
We present evidence from BeppoSAX and XMM–Newton of extreme X-ray variability in the high-luminosity radio-quiet quasar PDS 456, the most luminous known active galactic nucleus (AGN) at z < 0.3. Repeated X-ray flaring is found in PDS 456, over the duration of the 340-ks long BeppoSAX observation. The X-ray flux doubles in just 30 ks, whilst the total energy output of the flaring events is as high as 1051 erg. Under the assumption of isotropic emission at the Eddington limit, this implies that…

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