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Geometrical model fitting for interferometric data: GEM-FIND
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
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2012 (English)In: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 2012, Vol. 8445Conference paper, Published paper (Refereed)
Abstract [en]

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?

Place, publisher, year, edition, pages
2012. Vol. 8445
Series
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-196849DOI: 10.1117/12.925881OAI: oai:DiVA.org:uu-196849DiVA: diva2:610951
Conference
Society of Photo-Optical Instrumentation Engineers 4135 (SPIE) Conference
Available from: 2013-03-13 Created: 2013-03-13 Last updated: 2013-03-13

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Theoretical Astrophysics
Astronomy, Astrophysics and Cosmology

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