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Paper: Intrinsic Curvature in the X-ray Spectra of BL Lac Objects
Volume: 350, Blazar Variability Workshop II: Entering the GLAST Era
Page: 191
Authors: Perlman, E.S.; Daugherty, T.; Georganopoulos, M.; Koratkar, A.; Madejski, G.; Andersson, K.; Krolik, J.; Rector, T.; Stocke, J.T.; Wagner, S.; Aller, M.; Aller, H.; Allen, M.G.
Abstract: We report results from XMM-Newton observations of thirteen X-ray bright BL Lacertae objects, selected from the Einstein Slew Survey sample. The survey was designed to look for evidence of either curvature or line features in the X-ray spectra. Previous data had suggested absorption features in the X-ray spectra of some BL Lacs; however, none of our spectra show convincing examples of lines, either in absorption or emission. We find significant evidence for a constant, likely intrinsic, curvature in 14 of 17 X-ray spectra. We model the curvature as resulting from episodic particle acceleration.
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