THE GOODNESS OF SIMULTANEOUS FITS IN ISIS

Authors

  • Matthias Kühnel Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Sebastian Falkner Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Christoph Grossberger Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Ralf Ballhausen Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Thomas Dauser Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Fritz-Walter Schwarm Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Ingo Kreykenbohm Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Michael A. Nowak MIT Kavli Institute for Astrophysics, Cambridge, MA 02139, USA
  • Katja Pottschmidt CRESST, Center for Space Science and Technology, UMBC, Baltimore, MD 21250, USA NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • Carlo Ferrigno ISDC Data Center for Astrophysics, Chemin d’Écogia 16, 1290 Versoix, Switzerland
  • Richard E. Rothschild Center for Astronomy and Space Sciences, University of California, San Diego, La Jolla, CA 92093, USA
  • Silvia Martínez-Núñez X-ray Astronomy Group, University of Alicante, Spain
  • José Miguel Torrejón X-ray Astronomy Group, University of Alicante, Spain
  • Felix Fürst Cahill Center for Astronomy and Astrophysics, CALTECH, Pasadena, CA 91125, USA
  • Dmitry Klochkov Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
  • Rüdiger Staubert Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
  • Peter Kretschmar European Space Astronomy Centre (ESA/ESAC), Science Operations Department, Villanueva de la Cañada (Madrid), Spain
  • Jörn Wilms Dr. Karl Remeis-observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany

DOI:

https://doi.org/10.14311/APP.2016.56.0041

Keywords:

Methods, data analysis, X-rays, binaries

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.

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Published

2016-02-29

Issue

Vol. 56 No. 1 (2016)

Section

Articles

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How to Cite

Kühnel, M., Falkner, S., Grossberger, C., Ballhausen, R., Dauser, T., Schwarm, F.-W., Kreykenbohm, I., Nowak, M. A., Pottschmidt, K., Ferrigno, C., Rothschild, R. E., Martínez-Núñez, S., Torrejón, J. M., Fürst, F., Klochkov, D., Staubert, R., Kretschmar, P., & 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