The properties of BL Lacs in a complete sample of RASS Souces

Details The properties of BL Lacs in a complete sample of RASS Souces The properties of BL Lacs in a complete sample of RASS Souces

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.150m&link_type=abstract

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199

Astronomy and Astrophysics

Astronomy

Scientific paper

During the identification program of a complete sample of RASS sources (Zickgraf et al. 1997), BL Lacs were particularly difficult to identify due to their intrinsic spectroscopic properties. Therefore, we used their photometric variability as additional criterion. We monitored all the objects with a suspicious featureless spectrum, from the ID project, and with a radio detection. In addition, we checked their position in the \alphaox-\alpharo diagram. In this way, a variable object with a suspicious featureless spectrum and adequate spectral indices can be classified as a BL Lac. We present the results on the broad-band and optical variability properties of this subsample of BL Lacs. We found that several of the BL Lacs have intermediate positions (with respect to the RBLs and XBLs) in the \alphaox and \alpharo diagram. The existence of these objects put some restrictions to unifications models. We also found correlations between the spectral indices \alphaox, \alpharo and \alpharx and the amplitude of the variations, with smaller amplitudes for flatter overall, i.e.\ X-ray to radio, spectra.

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