Testing turbulence model at metric scales with mid-infrared VISIR images at the VLT

Details Testing turbulence model at metric scales with mid-infrared VISIR images at the VLT Testing turbulence model at metric scales with mid-infrared VISIR images at the VLT

2007-04-03

arxiv.org/abs/0704.0470v1

Mon.Not.Roy.Astron.Soc.378:701-708,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. 8 pages, 11 figures

Scientific paper

10.1111/j.1365-2966.2007.11803.x

We probe turbulence structure from centimetric to metric scales by simultaneous imagery at mid-infrared and visible wavelengths at the VLT telescope and show that it departs significantly from the commonly used Kolmogorov model. The data can be fitted by the von Karman model with an outer scale of the order of 30 m and we see clear signs of the phase structure function saturation across the 8-m VLT aperture. The image quality improves in the infrared faster than the standard lambda^{-1/5} scaling and may be diffraction-limited at 30-m apertures even without adaptive optics at wavelengths longer than 8 micron.

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