CfA OIR Division Lunch Talks
Thursday, May 29, 2008, 12:30 pm, Pratt Conference Room

Why Are Only Some Quasars Radio Sources?

Dr. Rudy Schild (CfA)

I show how direct microlensing-reverberation analysis performed on two well-known Quasars (Q2237 - The Einstein Cross, and Q0957 - The Twin) can be used to determine the inner structure of the two quasars, which are in significantly different spectral states. These observations allow us to measure the detailed internal structure of Q2237 in a radio quiet high-soft state, and compare it to Q0957 in a radio loud low-hard state. We find that the observed differences can be understood as being due to the location of the inner edge of their accretion discs relative to the co-rotation radii of rotating intrinsically magnetic supermassive compact objects in the centers of these quasars.