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

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

2001-04-21

arxiv.org/abs/astro-ph/0104351v2

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.

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