The goodness of simultaneous fits in ISIS
- Creators
- 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
- Torrejón, José Miguel
- Fürst, Felix
- Klochkov, Dmitry
- Staubert, Rüdiger
- Kretschmar, Peter
- Wilms, Jörn
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.
Additional Information
© Czech Technical University in Prague, 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. M. Kühnel was supported by the Bundesministerium für Wirtschaft und Technologie under Deutsches Zentrum für Luft- und Raumfahrt grants 50OR1113 and 50OR1207. The SLxfig module, developed by John E. Davis, was used to produce all figures shown in this paper. We are thankful for the constructive and critical comments by the reviewers, which were helpful to significantly improve the quality of the paper.Attached Files
Published - 3047-6920-1-PB.pdf
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Additional details
- Eprint ID
- 86120
- Resolver ID
- CaltechAUTHORS:20180430-101113775
- 50OR1113
- Deutsches Zentrum für Luft- und Raumfahrt (DLR)
- 50OR1207
- Deutsches Zentrum für Luft- und Raumfahrt (DLR)
- Created
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2018-04-30Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field