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PDS456: an extreme accretion-rate quasar?
Paul O'Brien (Leicester)
We present multi-wavelength (radio - X-ray) observations of the most
luminous object in the local (z<0.3) Universe: the nearby, radio-quiet
quasar PDS456. In the optical and near-IR, PDS456 is a brighter `twin' of
3C273. In the X-ray band, however, PDS456 displays a remarkable spectrum.
In particular, it has a very deep, ionized K edge coupled with fast X-ray
continuum variability (doubling in 15 ksecs). These properties are
consistent with the idea that PDS456 is a quasar running at an unusually
high accretion rate.
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