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The Microarcsecond Sky and Cosmic Turbulence | | T. Joseph W. Lazio
; J. M. Cordes
; A. G. de Bruyn
; J.-P. Macquart
; | | Date: |
5 Oct 2004 | | Journal: | New Astron.Rev. 48 (2004) 1439-1457 | | Subject: | astro-ph | | Affiliation: | 3,4), J.-P. Macquart ( NRL, Cornell U. and NAIC, ASTRON, Kapteyn Astronomical Institute | | Abstract: | Radio waves are imprinted with propagation effects from ionized media through which they pass. Owing to electron density fluctuations, compact sources (pulsars, masers, and compact extragalactic sources) can display a wide variety of scattering effects. These scattering effects, particularly interstellar scintillation, can be exploited to provide *superresolution*, with achievable angular resolutions (<~ 1 microarcsecond) far in excess of what can be obtained by very long baseline interferometry on terrestrial baselines. Scattering effects also provide a powerful sub-AU probe of the microphysics of the interstellar medium, potentially to spatial scales smaller than 100 km, as well as a tracer of the Galactic distribution of energy input into the interstellar medium through a variety of integrated measures. Coupled with future gamma-ray observations, SKA observations also may provide a means of detecting fainter compact gamma-ray sources. Though it is not yet clear that propagation effects due to the intergalactic medium are significant, the SKA will either detect or place stringent constraints on intergalactic scattering. | | Source: | arXiv, astro-ph/0410109 | | Services: | Forum | Review | PDF | Favorites | |
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