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On the time variability of gamma-ray sources

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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.
OriginalsprogEngelsk
TidsskriftAstronomische Nachrichten
Vol/bind322
Udgave nummer4
Sider (fra-til)223-227
Antal sider4
ISSN0004-6337
DOI
StatusUdgivet - 30 okt. 2001

ID: 34382900