A Very Rapid Extreme Scattering Event in the IDV Source 0954+658
نویسندگان
چکیده
منابع مشابه
1 A very rapid Extreme Scattering Event in the IDV source 0954 + 658
Extreme Scattering Events (ESEs) are dramatic variations of the flux density at Gigahertz frequencies caused by ray path distortions within an isolated inhomogeneity (“plasma lens”) in the interstellar medium. These events are characterized by a deep flux density minimum in the light curve with, in some cases, surrounding maxima. The variability time scales range from weeks to months. These phe...
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1 Hungarian Academy of Sciences, Research Group for Physical Geodesy and Geodynamics, Budapest, Hungary 2 FÖMI Satellite Geodetic Observatory, Budapest, Hungary 3 Max-Planck-Institute für Radioastronomie, Bonn, Germany 4 Urumqi Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Urumqi 830011, PR China 5 National Astronomical Observatories, Chinese Academy of Sciences...
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I re-examine the brightness temperature problem in PKS 0405-385 which is an extreme intra-day variable radio quasar with an inferred brightness temperature of ∼ 5×10 K at 5 GHz, well above the Compton catastrophe limit of ∼ 10 K reached when the synchrotron photon energy density exceeds the energy density of the magnetic field. If one takes into account the uncertainty in the distance to the io...
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Context. Short time-scale radio variations of compact extragalactic radio sources, known as IntraDay Variability (IDV), can be explained in at least some sources by a source-extrinsic effect, in which the variations are interpreted as scintillation of radio waves caused by the turbulent interstellar medium of the Milky Way. One of the most convincing observational arguments in favour of propaga...
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A strong case has been made that radio waves from sources within about half a degree of the Galactic center undergo extreme diffractive scattering. However, problems arise when standard (“Kolmogorov”) models of electron density fluctuations are employed to interpret the observations of scattering in conjunction with those of free-free radio emission. Specifically, the outer scale of a Kolmogoro...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 2002
ISSN: 1323-3580,1448-6083
DOI: 10.1071/as01097