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On the time variability of gamma-ray sources: A numerical analysis of variability indices

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arxiv astro-ph/0104351 v2 pith:77MXCDEZ submitted 2001-04-21 astro-ph gr-qc

On the time variability of gamma-ray sources: A numerical analysis of variability indices

classification astro-ph gr-qc
keywords variabilityindicessourcesanalysisdifferentlatitudeagnsapproaches
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We present a Monte Carlo analysis of the recently introduced variability indices $\tau$ (Tompkins 1999) and $I$ (Zhang et al. 2000 & Torres et al. 2001) for $\gamma$-ray sources. We explore different variability criteria and prove that these two indices, despite the very different approaches used to compute them, are statistically correlated (5 to 7$\sigma$). This conclusion is maintained also for the subset of AGNs and high latitude ($|b|>10$ deg) sources, whereas the correlation is lowered for the low latitude ones, where the influence of the diffuse galactic emission background is strong.

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