AO Strehl maps

Maps of Strehl ratio (a measure of light concentration) in the case of single conjugated adaptive optics, i.e. as used in present AO systems (SCAO; left) and multi-conjugated (MCAO; right), as measured in images of Omega Centauri. Different colours correspond to different Strehl ratios, from 0 (black) to red (35%). The SCAO map illustrates how inhomogeneous the correction is across the field of view. The peak Strehl ratio is about 30% close to the guide star, to the right, and decreases with the distance to the guide star due to atmospheric anisoplanatism. The MCAO map, however, is much more uniform across the field of view, and peaks close to the location of the three guide stars shown by crosses. A comparison between the two images clearly shows the advantage of MCAO.

Crediti:

ESO

A proposito dell'immagine

Identificazione:eso0719d
Tipo:Collage
Data di pubblicazione:30 Marzo 2007
Notizie relative:eso0719
Dimensione:1421 x 696 px

A proposito delll'oggetto

Nome:Omega Centauri
Tipo:Milky Way : Star : Grouping : Cluster : Globular
Distanza:17000 Anni luce
Categoria:Star Clusters

Formati delle immagini

JPEG grande
234,2 KB