The Goodness of Simultaneous Fits in ISIS

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Title: The Goodness of Simultaneous Fits in ISIS
Authors: Kühnel, Matthias | Falkner, Sebastian | Grossberger, Christoph | Ballhausen, Ralf | Dauser, Thomas | Schwarm, Fritz-Walter | Kreykenbohm, Ingo | Nowak, Michael A. | Pottschmidt, Katja | Ferrigno, Carlo | Rothschild, Richard E. | Martínez Núñez, Silvia | Torrejon, Jose M. | Fürst, Felix | Klochkov, Dmitry | Staubert, Rüdiger | Kretschmar, Peter | Wilms, Jörn
Research Group/s: Astronomía y Astrofísica
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Keywords: Data analysis | Multiple datasets | X-rays: binaries
Knowledge Area: Física Aplicada
Issue Date: 2016
Publisher: Czech Technical University in Prague
Citation: Acta Polytechnica. 2016, 56(1): 41-46. doi:10.14311/APP.2016.56.0041
Abstract: In a previous work, we introduced a tool for analyzing multiple datasets simultaneously, which has been implemented into ISIS. This tool was used to fit many spectra of X-ray binaries. However, the large number of degrees of freedom and individual datasets raise an issue about a good measure for a simultaneous fit quality. We present three ways to check the goodness of these fits: we investigate the goodness of each fit in all datasets, we define a combined goodness exploiting the logical structure of a simultaneous fit, and we stack the fit residuals of all datasets to detect weak features. These tools are applied to all RXTE-spectra from GRO 1008−57, revealing calibration features that are not detected significantly in any single spectrum. Stacking the residuals from the best-fit model for the Vela X-1 and XTE J1859+083 data evidences fluorescent emission lines that would have gone undetected otherwise.
Sponsor: M. Kühnel was supported by the Bundesministerium für Wirtschaft und Technologie under Deutsches Zentrum für Luft- und Raumfahrt grants 50OR1113 and 50OR1207.
ISSN: 1210-2709 (Print) | 1805-2363 (Online)
DOI: 10.14311/APP.2016.56.0041
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Czech Technical University in Prague, 2016. This work is licensed under a Creative Commons Attribution 4.0 International License
Peer Review: si
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Appears in Collections:INV - Astronomía y Astrofísica - Artículos de Revistas

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