Interstellar scintillations and nanoarcsecond resolution in radio astronomy

Details Interstellar scintillations and nanoarcsecond resolution in radio astronomy Interstellar scintillations and nanoarcsecond resolution in radio astronomy

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010arep...54..724s&link_type=abstract

Astronomy Reports, Volume 54, Issue 8, pp.724-729

Astronomy and Astrophysics

Astronomy

Scientific paper

Interstellar turbulent plasma can be considered to be a radio astronomy antenna—an interstellar diffraction grating, with an aperture size roughly equal to the scattering-disk radius, R sc = z eff θ sc ≈ 1 AU (where z eff is the effective distance and θ sc the scattering angle). The angular resolution of this interstellar diffraction grating is of the order of ϕ dif = 1/( k R sc ). A single ground-based radio telescope can be used as a receiver for the interstellar diffraction grating. The grating’s parameters can be obtained only from observations on a system of interferometers with an angular resolution comparable to the scattering angle θ sc . The range of baselines necessary to determine the parameters of the grating is close that of the Earth-space RadioAstron interferometer.

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