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

Citation
Df. Torres et al., On the time variability of gamma-ray sources: a numerical analysis of variability indices, ASTRON NACH, 322(4), 2001, pp. 223-227
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMISCHE NACHRICHTEN
ISSN journal
0004-6337 → ACNP
Volume
322
Issue
4
Year of publication
2001
Pages
223 - 227
Database
ISI
SICI code
0004-6337(2001)322:4<223:OTTVOG>2.0.ZU;2-J
Abstract
We present a Monte Carlo analysis of the recently introduced variability in dices tau (Tompkins 1999) and I (Zhang et al. 2000 & Torres et al. 2001) fo r gamma -ray sources. We explore different variability criteria and prove t hat these two indices, despite the very different approaches used to comput e them, are statistically correlated (5 to 7 sigma). This conclusion is mai ntained also for the subset of AGNs and high latitude (\b \ > 10 deg) sourc es, whereas the correlation is lowered for the low latitude ones, where the influence of the diffuse galactic emission background is strong.