Reeves, J. N.J. N.ReevesBRAITO, ValentinaValentinaBRAITONARDINI, EMANUELEEMANUELENARDINIHamann, F.F.HamannChartas, G.G.ChartasLobban, A. P.A. P.LobbanO'Brien, P. T.P. T.O'BrienTurner, T. J.T. J.Turner2020-11-182020-11-1820180004-637Xhttp://hdl.handle.net/20.500.12386/28417Simultaneous XMM-Newton, NuSTAR, and HST observations, performed in 2017 March, of the nearby (z = 0.184) luminous quasar PDS 456 are presented. PDS 456 had a low X-ray flux compared to past observations, where the first of the two new XMM-Newton observations occurred during a pronounced dip in the X-ray light curve. The broadband X-ray spectrum is highly absorbed, attenuated by a soft X-ray absorber of column density N <SUB>H</SUB> = 6 × 10<SUP>22</SUP> cm<SUP>-2</SUP>. An increase in obscuration occurs during the dip, which may be due to an X-ray eclipse. In addition, the persistent, fast Fe K outflow is present, with velocity components of -0.25c and -0.4c. The soft absorber is less ionized ({log}ξ =3) compared to the iron K outflow ({log}ξ =5) and is outflowing with a velocity of approximately -0.2c. A soft X-ray excess is present below 1 keV against the highly absorbed continuum and can be attributed to the re-emission from a wide-angle wind. The complex X-ray absorption present in PDS 456 suggests that the wind is inhomogeneous, whereby the soft X-ray absorber originates from denser clumps or filaments that may form farther out along the outflow. In contrast to the X-ray observations, the simultaneous UV spectrum of PDS 456 is largely unabsorbed, where only a very weak broad absorption trough is present blueward of Lyα, compared to a past observation in 2000 when the trough was significantly stronger. The relative weakness of the UV absorption may be due to the soft X-ray absorber being too highly ionized and almost transparent in the UV band.STAMPAenArticle10.3847/1538-4357/aae30c2-s2.0-85056079384000448736000005https://iopscience.iop.org/article/10.3847/1538-4357/aae30c2018ApJ...867...38RFIS/05 - ASTRONOMIA E ASTROFISICA