1 / 2

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.

kemal
Download Presentation

Extremely fast variability in the quasar J1819+3845

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related