Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-15
Astronomy and Astrophysics
Astrophysics
20 pages, including 7 figures; accepted by The Astrophysical Journal
Scientific paper
10.1086/322462
Light curves of 3C 279 are presented in optical (R-band), X-rays (RXTE/PCA), and gamma rays (CGRO/EGRET) for 1999 Jan-Feb and 2000 Jan-Mar. During both of those epochs the gamma-ray levels were high, and all three observed bands demonstrated substantial variation, on time scales as short as one day. Correlation analyses provided no consistent pattern, although a rather significant optical/gamma-ray correlation was seen in 1999, with a gamma-ray lag of ~2.5 days, and there are other suggestions of correlations in the light curves. For comparison, correlation analysis is also presented for the gamma-ray and X-ray light curves during the large gamma ray flare in 1996 Feb and the two gamma-bright weeks leading up to it; the correlation at that time was strong, with a gamma-ray/X-ray offset of no more than 1 day.
Balonek Thomas J.
Bertsch David L.
Bock H.
Boettcher Markus
Carini Michael T.
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