Ultraviolet and X-ray variability of active galactic nuclei withSwift

• DOI: 10.1093/mnras/stw2486
• Publication Date: 2016-09-29T19:06:19Z
• Authors: D. J. K. Buisson; A. M. Lohfink; W. N. Alston; A. C. Fabian
• Keywords: Swift; Ultraviolet

We analyse a sample of 21 active galactic nuclei using data from the Swift satellite to study variability properties population in X-ray, UV and optical band. find that variable part UV–optical emission has spectrum consistent with power law, an average index −2.21 ± 0.13, as would be expected central illumination thin disc (index −7/3). also calculate slope law X-ray emission, αOX, Var; for this is Var = −1.06 0.04. The anticorrelation αOX luminosity, LUV, previously found present part: ( − 0.177 0.083)log (Lν, Var(2500 Å)) + (3.88 2.33). Correlated between X-rays detected significantly 9 sources. All these cases are lagging X-rays, seen if correlated variations were produced by reprocessing emission. observed lags tentatively longer than standard disc.