Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-24
Astrophys.J. 646 (2006) 61-75
Astronomy and Astrophysics
Astrophysics
20 pages, 11 figures, accepted for publication in ApJ
Scientific paper
10.1086/504700
We present X-ray observations of the blazar Mrk501 obtained with RXTE during 1997, 1998, 1999, 2000, and 2004. The goal of this study is twofold: 1) characterize the long-term X-ray flux and spectral variability of the source with a model-independent analysis, and 2) investigate the X-ray and TeV correlation on long timescales. The spectral and temporal variability properties appear to be markedly different compared to those of non-jet-dominated radio-loud and radio-quiet AGN monitored with RXTE. To investigate the X-ray/TeV correlation on long timescales we compared RXTE data with HEGRA and Whipple historical light curves. We confirm the presence of a direct correlation, which appears to be stronger when the source is brighter. The analysis of individual flares shows that the X-ray\TeV correlated activity is heterogeneous. However, more sensitive TeV observations are necessary to confirm these findings, and to put tighter constraints on jet models (abridged).
Gliozzi Mario
Horan Deirdre
Jung Inhwa
Krawczynski Henric
Sambruna Rita
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