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- W2006995767 abstract "The low-luminosity active galactic nucleus of M81 has been monitored at centimeter wavelengths since early 1993 as a by-product of radio programs to study the radio emission from supernova 1993J. The extensive data sets reveal that the nucleus experienced several radio outbursts during the monitoring period. At 2 and 3.6 cm, the main outburst occurred roughly in the beginning of 1993 September and lasted for approximately 3 months; at longer wavelengths, the maximum flux density decreases and the onset of the burst is delayed. These characteristics qualitatively resemble the standard model for adiabatically expanding radio sources, although certain discrepancies between the observations and the theoretical predictions suggest that the model is too simplistic. In addition to the large-amplitude, prolonged variations, we also detected milder changes in the flux density at 3.6 cm and possibly at 6 cm on short (≲1 day) timescales. We discuss a possible association between the radio activity and an optical flare observed during the period that the nucleus was monitored at radio wavelengths." @default.
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- W2006995767 date "1999-08-01" @default.
- W2006995767 modified "2023-10-16" @default.
- W2006995767 title "Discovery of Radio Outbursts in the Active Nucleus of M81" @default.
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- W2006995767 doi "https://doi.org/10.1086/300950" @default.
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