6.1 Examples for Reducing Spectra

   

In this section typical EXSAS sessions are given to get familiar with the spectral analysis package without claiming any completeness:

1. Extract a spectrum of a point source from an event file and fit a power law model to it.
2. Calculate values for a grid of parameters and plot error contour lines at given confidence levels.    
3. Calculate a photon flux spectrum.
4. Calculate integrated photon and energy fluxes.
5. Calculate total count rate of a source.
6. Calculate a luminosity.
7. Convert a count rate into a flux.

For this purpose a special directory with the path name testdata1: is delivered with the system. This directory contains real X-ray data taken by ROSAT.   Since some of the calibration files may be changed in the meantime results can be slightly different.

Not as an alternative but more than a completion of these examples the study of the spectral tutorial might be valuable.

 
• Power Law Fit to a Point Source
• Chi-square Grid Search
• Calculation of Photon Flux Spectrum
• Calculation of Photon and Energy Flux
• Calculation of a total Count Rate
• Calculation of Luminosity
• Calculation of Energy Flux from a Count Rate