Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-11-02
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
5 pages, 2 figures, invited lecture at "Young Scientits' Conference on Astronomy and Space Physics", Kiev, Taras Shevchenko Na
Scientific paper
This talk focuses on the statistical properties of X-ray selected BL Lacertae objects (XBLs) whose catalogue has been compiled. It consists of 312 sources from different X-ray surveys, unambiguously identified to mid-2010. Results of the statistical research of different observational quantities (redshift, muliwavelength luminosities, host/nucleus absolute Magnitudes, central black hole masses, synchrotron peak frequencies, broadband spectral indices) are also provided and existence of the correlation between them is proved. Overall flux variability shows an increasing trend towards greater frequencies. XBL are found to be much less active in point of intra-night optical variability compared to radio-selected BL Lacs (RBLs). A separate list of 106 XBL candidates is also created including the same characteristics for each source as in the case of XBL catalogue.
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