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

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https://ojs.cvut.cz/ojs/index.php/ap/article/view/2983

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https://doi.org/10.14311/AP.2015.55.0123
 http://hdl.handle.net/11603/29563

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

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https://orcid.org/0000-0002-4656-6881

Date

2015-04-30

Type of Work

journal articles
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Citation of Original Publication

Kühnel, M., S. Müller, I. Kreykenbohm Kreykenbohm, F.-W. Schwarm, C. Grossberger, B. T. Dauser, M. A. Nowak, K. Pottschmidt, C. Ferrigno, R. E. Rothschild, D. Klochkov, R. Staubert, and J. Wilms. 2015. “SIMULTANEOUS FITS IN ISIS ON THE EXAMPLE OF GRO J1008–57”. Acta Polytechnica 55 (2):126-27. https://doi.org/10.14311/AP.2015.55.0123.

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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.