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- W2094564385 abstract "Abstract The quasar J1819+3845 has shown extreme variability with flux density variations in the radio regime up to 600% in less than one hour. In case of intrinsic high varibility, the short time scale sets a limit on the size of the emitting region and allows to estimate its brightness temperature. This would exceed 10 21 K in the case of J1819+3845. Even an high relativistic jet beamed and doppler boosted in our line of sight cannot explain such an extreme violation of the Inverse Compton limit (10 12 K). The variability of this source has been proven to be due to scattering in the Interstellar medium by a number of different experiments. Such an explanation requires a closeby scattering screen (few parsecs) and it results in a brightness temperature of about 10 14 K. Many observing campaigns have been carried on to map the innermost jet structures of J1819+3845. Here we present the results of a number of VLBI observations, including space VLBI, to search for the missing jet in this puzzling source." @default.
- W2094564385 created "2016-06-24" @default.
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- W2094564385 date "2010-09-01" @default.
- W2094564385 modified "2023-10-17" @default.
- W2094564385 title "Multi-Epoch VLBI observations of the extreme scintillator J1819+3845" @default.
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- W2094564385 doi "https://doi.org/10.1017/s1743921310016005" @default.
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