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Proceedings Paper

Image reconstruction for observations with a high dynamic range: LINC-NIRVANA simulations of a stellar jet
Author(s): Andrea La Camera; Simone Antoniucci; Mario Bertero; Patrizia Boccacci; Dario Lorenzetti; Brunella Nisini
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Paper Abstract

We report the results of a simulation and reconstruction of observations of a young stellar object (YSO) jet with the LINC-NIRVANA (LN) interferometric instrument, which will be mounted on the Large Binocular Telescope (LBT). This simulation has been performed in order to investigate the ability of observing the weak diffuse jet line emission against the strong IR stellar continuum through narrow band images in the H and K atmospheric windows. In general, this simulation provides clues on the image quality that could be achieved in observations with a high dynamic range. In these cases, standard deconvolution methods, such as Richardson-Lucy, do not provide satisfactory results: we therefore propose here a new method of image reconstruction. It consists in considering the image to be reconstructed as the sum of two terms: one corresponding to the star (whose position is assumed to be known) and the other to the jet. A regularization term is introduced for this second component and the reconstruction is obtained with an iterative method alternating between the two components. An analysis of the results shows that the image quality obtainable with this method is significantly improved with respect to standard deconvolution methods, reducing the number of artifacts and allowing us to reconstruct the original jet intensity distribution with an error smaller than 10%.

Paper Details

Date Published: 1 September 2012
PDF: 11 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84453D (1 September 2012); doi: 10.1117/12.925539
Show Author Affiliations
Andrea La Camera, Univ. degli Studi di Genova (Italy)
Simone Antoniucci, INAF - Osservatorio Astronomico di Roma (Italy)
Mario Bertero, Univ. degli Studi di Genova (Italy)
Patrizia Boccacci, Univ. degli Studi di Genova (Italy)
Dario Lorenzetti, INAF - Osservatorio Astronomico di Roma (Italy)
Brunella Nisini, INAF - Osservatorio Astronomico di Roma (Italy)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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