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• W3100809033 abstract "Rapid variability in the radio flux density of the BL Lac object PKSB1144-379 has been observed at four frequencies, ranging from 1.5 to 15 GHz, with the VLA and the University of Tasmania's Ceduna antenna. Intrinsic and line of sight effects were examined as possible causes of this variability, with interstellar scintillation best explaining the frequency dependence of the variability timescales and modulation indices. This scintillation is consistent with a compact source 20-40 microarcseconds, or 0.15-0.3 pc in size. The inferred brightness temperature for PKSB1144-379 (assuming that the observed variations are due to scintillation) is 6.2e12 K at 4.9 GHz, with approximately 10 percent of the total flux in the scintillating component. We show that scintillation surveys aimed at identifying variability timescales of days to weeks are an effective way to identify the AGN with the highest brightness temperatures." @default.
• W3100809033 created "2020-11-23" @default.
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• W3100809033 date "2012-07-10" @default.
• W3100809033 modified "2023-10-17" @default.
• W3100809033 title "BL LAC OBJECT PKS B1144–379: AN EXTREME SCINTILLATOR" @default.
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• W3100809033 doi "https://doi.org/10.1088/2041-8205/754/2/l19" @default.
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