Performance of SPI Point-Source Data Analysis

Details Performance of SPI Point-Source Data Analysis Performance of SPI Point-Source Data Analysis

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..841d&link_type=abstract

Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific

Computer Science

Performance

Scientific paper

Performances of SPI data analyses of point sources are assessed using the Crab observations gathered during the first year of INTEGRAL operations. At low and inter- mediate signal-to-noise (S/N) ratios, the errors for both positions and fluxes provided by the imaging reconstruc- tion program spiros are perfectly consistent with the dis- tributions of the results of independent analyses. For higher S/N, spiros underestimates the real uncertainties, certainly because it does not take into account system- atic errors, which can become comparable, or even larger, than statistical ones. Realistic source confusion tests are carried out by adding simulated data to the Crab observa- tion. These tests demonstrate that spurious results can be obtained when the source separation is equal or smaller than 2 degrees. However, reliable flux values can be ob- tained for closer sources if their positions are fixed in the data deconvolution process.

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