Forskning ved Københavns Universitet - Københavns Universitet


On the time variability of gamma-ray sources

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

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.
TidsskriftAstronomische Nachrichten
Udgave nummer4
Sider (fra-til)223-227
Antal sider4
StatusUdgivet - 30 okt. 2001

ID: 34382900