On the Gini-statistic and the search for variability in a HESS PKS 2155-304 time series

Details On the Gini-statistic and the search for variability in a HESS PKS 2155-304 time series On the Gini-statistic and the search for variability in a HESS PKS 2155-304 time series

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..295v&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Gini statistic (V_n) considers individual photons and is standard normally distributed for exponentially distributed arrival times. The statistic can identify segments in a light curve within which the count rate changes and may therefore indicate the presence of variability. V_n is calculated for data from constant count rate and simple assumed intrinsic source simulations, windowing the photon lists on time-intervals between 10 s and 500 s. %, which implies the presence of a multitude of faint flares contributing to these timescales. Plots of V_n vs. time show that peak values of the statistic identify sufficiently sharp changes in the slope of a light curve. Qualitatively, V_n(t) identifies small flares that are 'visible' in the light curve and thus does not add information.

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