SIMULTANEOUS FITS IN ISIS ON THE EXAMPLE OF GRO J1008–57

Authors

  • M. Kühnel Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • S. Müller Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • I. Kreykenbohm Kreykenbohm Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • F.-W. Schwarm Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • C. Grossberger Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • B. T. Dauser Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • M. A. Nowak MIT Kavli Institute for Astrophysics, Cambridge, MA 02139, USA
  • K. Pottschmidt CRESST, Center for Space Science and Technology, UMBC, Baltimore, MD 21250, USA NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • C. Ferrigno ISDC Data Center for Astrophysics, Chemin d’Écogia 16, 1290 Versoix, Switzerland
  • R. E. Rothschild Center for Astronomy and Space Sciences, University of California, San Diego, La Jolla, CA 92093, USA
  • D. Klochkov Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
  • R. Staubert Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
  • J. Wilms Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany

DOI:

https://doi.org/10.14311/AP.2015.55.0123

Abstract

Parallel computing and steadily increasing computation speed have led to a new tool for analyzing multiple datasets and datatypes: fitting several datasets simultaneously.  With this technique, physically connected parameters of individual data can be treated as a single parameter by implementing this connection directly into the fit. We discuss the terminology, implementation, and possible issues of simultaneous fits based on the Interactive Spectral Interpretation System (ISIS) X-ray data analysis tool. While all data modeling tools in X-ray astronomy in principle allow data to be fitted individually from multiple data sets, the syntax used in these tools is not often well suited for this task. Applying simultaneous fits to the transient X-ray binary GRO J1008–57, we find that the spectral shape is only dependent on X-ray flux. We determine time independent parameters e.g., the folding energy Efold, with unprecedented precision.

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Published

2015-04-30

How to Cite

Kühnel, M., Müller, S., Kreykenbohm, I. K., Schwarm, F.-W., Grossberger, C., Dauser, B. T., Nowak, M. A., Pottschmidt, K., Ferrigno, C., Rothschild, R. E., Klochkov, D., Staubert, R., & Wilms, J. (2015). SIMULTANEOUS FITS IN ISIS ON THE EXAMPLE OF GRO J1008–57. Acta Polytechnica, 55(2), 126–127. https://doi.org/10.14311/AP.2015.55.0123

Issue

Vol. 55 No. 2 (2015)

Section

Articles