MASIV:The Microarcsecond Scintillation-Induced Variability Survey

Details MASIV:The Microarcsecond Scintillation-Induced Variability Survey MASIV:The Microarcsecond Scintillation-Induced Variability Survey

2007-01-21

arxiv.org/abs/astro-ph/0701601v1

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures, invited talk at "Small Ionized and Neutral Structures in Diffuse Interstellar Medium" meeting, to be publ

Scientific paper

We are undertaking a large-scale 5 GHz VLA survey of the northern sky to search for rapid intra-day variability (IDV). Over four observing epochs we found that 56% of the sources showed variability on timescales of hours to several days. Fewer variables were seen at high galactic latitudes, supporting interstellar-scintillation as the principal mechanism responsible for IDV. We find evidence that many of the scattering screens are not moving with the local standard of rest. There are few scintillating sources seen at high redshift which may be an indication of scattering in the turbulent intergalactic medium.

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