
TY  - JOUR
A1  - Valtaoja, E. 
A1  - Savolainen, T. 
A1  - Wiik, K. 
A1  - L&auml;hteenm&auml;ki, A. 
T1  - Millimetre Continuum Variations, VLBI Structure and Gamma Rays: Investigating Shocked Jet Physics
JF  - Publications of the Astronomical Society of Australia
JO  - Publ. Astron. Soc.  Aust.
Y1  - 2002
VL  - 19
IS  - 1
SP  - 117
EP  - 121
KW  - black hole physics &#8212; galaxies: active &#8212; galaxies: jets &#8212; X-rays: binaries &#8212; radio continuum: galaxies &#8212; radio continuum: stars
UR  - https://doi.org/10.1071/AS01117 
N2  - We compare the total flux density variations and the VLBI structural variations in a sample of 27 gamma-ray blazars. We find that all the radio variations are due to shocks; the flux of the underlying jet remains constant. A large fraction of the shocks grow and fade within the innermost 0.1 mas, appearing only as &#8216;core flares&#8217;. Comparisons with the EGRET data show that gamma-ray flares must come from the shocks, not from the jet. At the time of an EGRET flare, the shock is typically already over a parsec downstream from the radio core, beyond the accretion disk and/or the broad line region (BLR) photon fields. Thus, present models for gamma-ray production are inadequate, since they typically model the gamma-ray inverse Compton flux as coming from the jet, with significant disk or BLR external Compton components. 
ER  -

