Geometrical model fitting for interferometric data: GEM-FIND

Author(s)

Daniela Klotz, Stephane Sacuto, Claudia Paladini, Josef Hron, Georg Wachter

Abstract

We developed the tool GEM-FIND that allows to constrain the morphology

and brightness distribution of ob- jects. The software fits geometrical

models to spectrally dispersed interferometric visibility measurements

in the N-band using the Levenberg-Marquardt minimization method. Each

geometrical model describes the bright- ness distribution of the object

in the Fourier space using a set of wavelength-independent and/or

wavelength- dependent parameters. In this contribution we numerically

analyze the stability of our nonlinear fitting approach by applying it

to sets of synthetic visibilities with statistically applied errors,

answering the following questions: How stable is the parameter

determination with respect to (i) the number of uv-points, (ii) the

distribution of points in the uv-plane, (iii) the noise level of the

observations?

Organisation(s)

Department of Astrophysics

External organisation(s)

Veterinärmedizinische Universität Wien, Technische Universität Wien

Volume

8445

Pages

14

DOI

https://doi.org/10.1117/12.925881

Publication date

07-2012

Austrian Fields of Science 2012

103004 Astrophysics, 103003 Astronomy

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