The simulated image to the left
was created by E. K. Hege and J. R. P. Angel as an example of the kind of
image LBT would make of a familiar object. Their starting point was a Galileo
spacecraft image of Jupiter's moon Io taken in visible light. Io is one of
Jupiter's Galilean moons and has more volcanoes than any other world.
The upper image "a" is a
simulated LBT image created by convolving the spacecraft image with the LBT
point spread function. This image corresponds to a single LBT exposure. The
resolution was modeled for wavelengths of 0.8, 1.25 and 1.65 microns in the
near-infrared (displayed here as blue, green and red). Because of the
binocular aperture of LBT, this image is sharper in the left-right direction
(resolution corresponding to 22.8 m baseline) than in the top-bottom direction
(resolution corresponding to 8.4 m baseline). The point spread function (PSF)
of LBT can be seen in the image at the right of this page created by Serge
Corriea of Arcetri Observatory. The PSF can also be seen in the simulated star
image just to the lower left of Io's disk. These images assume that the LBT
adaptive optics system is correcting the blurring caused by turbulence in
Earth's atmosphere.
By taking several such images
through a night, the astronomer can deconvolve the images to recover the image
quality of a 22.8 m circular aperture. This resolution is demonstrated by the
"b" image of Io in the lower panel. The lower image is the result of
combining three LBT images taken at different angles in the computer.