Publications of the MPIfR
Optical & Infrared
Interferometry Group
Hofmann, K.-H., Driebe, T., Heininger,
M.,
Schertl, D., Weigelt, G.,
Aperture-synthesis imaging with the LBT:
Reconstruction
of diffraction-limited images from LBT LINC-NIRVANA data using
the Richardson-Lucy
and regularized Building Block method
Advances in Stellar Interferometry
Proceedings of SPIE: Vol. 6268, p.62683H-(1-11)
Danchi, W., Monnier, J., Schöller, M. (eds.)
Abstract
The regularized and spacevariant Building Block method1 allow the
reconstruction of diffractionlimited aperture synthesis images from
Large Binocular Telescope (LBT) LINCNIRVANA data. Images with the
diffraction limited resolution of a 22.8 m singledish telescope can
be reconstructed if raw images are taken at several different hour
angles. Computergenerated and laboratory LBT interferograms were
simulated that are similar to the data which can be obtained with the
LINCNIRVANA beam combiner instrument. From the simulated
interferograms, diffractionlimited images were reconstructed with the
regularized Building Block method, which is an extension of the
Building Block method2 We compare the Building Block reconstructions to
images ob tained with the RichardsonLucy (RL) method3,4 and the
Ordered Subsets Expectation Maximization (OSEM) method.5,6 Our image
reconstruction studies were performed with computersimulated Jband
and laboratory Hband raw data of a galaxy with simulated total
magnitudes of J = 16 to 18 and H = 16 to 19, respectively. One of the
faintest structures in the images has a brightness of J~25. The
simulated reference stars within the isoplanatic patch have magnitudes
of J = 20 21 and H = 19. All three methods are able to reconstruct
diffractionlimited images of similar quality.
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