3 yrs of time
10 lyr
Blazars/Quasars
•synchrotron radiation ® jets of relativistic
particles
•blazars: double radio sources seen
end-on
•motions superluminal
– appear to exceed speed of light
–usually 5 to 10 x c
•superluminal motions observed in some
quasars (1 to 5 x
c)
•3C 273: radio emission separating at 0.001 arsec/yr
® 10 x 3 x 105 km/s !
