Limits on refractive interstellar scattering toward Sagittarius B2

Details Limits on refractive interstellar scattering toward Sagittarius B2 Limits on refractive interstellar scattering toward Sagittarius B2

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..817g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 817-827.

Astronomy and Astrophysics

Astrophysics

44

H Ii Regions, Interstellar Masers, Interstellar Matter, Milky Way Galaxy, Water Masers, Flux Density, Histograms, Kolmogoroff Theory, Normal Density Functions, Power Spectra, Size Distribution

Scientific paper

The authors place an upper limit on the spectral index of density fluctuations in the interstellar plasma by comparing apparent maser sizes, due to small-scale fluctuations, with wander in position of masers about constant-velocity paths, due to refraction by large-scale fluctuations. The scattered images of H2O maser spots in Sgr B2(N) are about 300 microarcseconds in diameter, while their deviation from constant-velocity motion is less than 18 microarcseconds. These two measurements constrain possible power-law spectra of the density fluctuations to indices less than or about the Kolmogorov value of 3.67; alternatively, the spectrum may have a long-wavelength cutoff at about 1013cm.

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