The goodness of simultaneous fits in ISIS

Kühnel M, Falkner S, Großberger C, Ballhausen R, Dauser T, Schwarm FW, Kreykenbohm I, Nowak MA, Pottschmidt K, Ferrigno C, Rothschild RE, Martínez-Núñez S, Torrejón JM, Fürst F, Klochkov D, Staubert R, Kretschmar P, Wilms J (2016)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Acta Polytechnica Czech Technical University, Publishing House

Publisher: Czech Technical University

Book Volume: 56

Pages Range: 41-46

Journal Issue: 1

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.

Authors with CRIS profile

Matthias Bissinger Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Sebastian Falkner Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Christoph Großberger Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Ralf Ballhausen Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Thomas Dauser Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Fritz-Walter Schwarm Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Ingo Kreykenbohm Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut Jörn Wilms Professur für Astronomie und Astrophysik

Involved external institutions

Massachusetts Institute of Technology (MIT) US United States (USA) (US) Eberhard Karls Universität Tübingen DE Germany (DE) California Institute of Technology (Caltech) US United States (USA) (US) University of Alicante / Universidad de Alicante / Universitat d'Alacant ES Spain (ES) University of California, San Diego US United States (USA) (US) University of Maryland, Baltimore County (UMBC) US United States (USA) (US) European Space Astronomy Centre (ESAC) ES Spain (ES) University of Geneva / Université de Genève (UNIGE) CH Switzerland (CH)

How to cite

APA:

Kühnel, M., Falkner, S., Großberger, C., Ballhausen, R., Dauser, T., Schwarm, F.-W.,... Wilms, J. (2016). The goodness of simultaneous fits in ISIS. Acta Polytechnica, 56(1), 41-46. https://doi.org/10.14311/APP.2016.56.0041

MLA:

Kühnel, Matthias, et al. "The goodness of simultaneous fits in ISIS." Acta Polytechnica 56.1 (2016): 41-46.

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