The most important results obtained from the BeppoSAX observation of the luminous quasar PDS 456 can be summarized as follows:
Further investigations with CHANDRA and XMM would be extremely helpful to assess the nature of the X-ray emission (both in the soft and in hard X-rays domain) and the ionization state of the absorbing matter. Moreover, X-ray spectroscopy of others bright, relatively nearby quasars would be very important to check whether PDS 456 is an exceptional object or the imprints of highly ionized high column density gas are common in luminous quasars. A better knowledge of the X-ray properties of bright AGN would also allow to probe the physics of accretion processes at high luminosities.
© European Southern Observatory (ESO) 2000
Online publication: October 30, 19100