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Paper: Properties of BL Lac Objects in a Complete Sample of Northern RASS Sources
Volume: 159, BL Lac Phenomenon
Page: 513
Authors: Mujica, R.; Zickgraf, F.-J.
Abstract: We have identified and studied the BL Lacs in a subsample of X-ray sources detected during the ROSAT All-Sky Survey. We exploited their intrinsic broad-band and variability properties to reliably identify them. We found that several of our objects fall in a region that was previously thought to be empty in the alpha _ox - alpha_ro diagram that can be interpreted as a transition between the two classes of (RBLs and XBLs). We also found correlations between the spectral indices alpha_ox and alpha_ro and the amplitude of the variations.
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