Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-21
Astron.Nachr. 322 (2001) 223-227
Astronomy and Astrophysics
Astrophysics
Small changes to match published version in Astronomische Nachrichten (2001). Paper accepted in July 2001
Scientific paper
10.1002/1521-3994(200110)322:4<2
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.
Pessah Martin E.
Romero Gustavo E.
Torres Diego F.
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