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Extremely fast variability in the quasar J1819+3845

Extremely fast variability in the quasar J1819+3845 Ger de Bruyn, Jane Dennett-Thorpe & Jean-Pierre Macquart ( ApJL , 2000; Nature, 2001, A&A 2003, A&A 2005, A&A 2006) + contributions by Leonid Gurvits , Denise Gabuzda , Brian Moloney , Guiseppe Cimo. 22 Jan 2006.

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Extremely fast variability in the quasar J1819+3845

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  1. Extremelyfastvariability in the quasar J1819+3845 Ger de Bruyn, Jane Dennett-Thorpe& Jean-Pierre Macquart (ApJL, 2000; Nature, 2001, A&A 2003, A&A 2005, A&A 2006) + contributionsbyLeonidGurvits , Denise Gabuzda, BrianMoloney, GuiseppeCimo 22 Jan 2006 Time delays+ VLBI separationbetween I and Q/U yielddistance ! 12 hour

  2. The variationsin J1819+3845 are NOT intrinsicbutdue to interstellarscintillations • Important, and unique, observations: • systematicseasonalvariations (factor 10 change) • still most dramatic extragalacticsource • variable time delay of ~100s between WSRT and VLA • veryrichpolarizationstructure, delayed in time • variationsstoppedabruptly in 2007 ! • Astrophysicalconclusions: • normalalthough compact (< 0.5 massize) quasar • turbulent screen extremely close to Sun: ~ 1-2 pc !! • sharpedge to screen, lessthan ~ 10 AU • origin screen stillmystery (colliding IS clouds ?) 1.25ox 1.25o

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