Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..749w&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 749-752 (SEE N90-258
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Bl Lacertae Objects, Galactic Radiation, Luminosity, Mathematical Models, Prediction Analysis Techniques, Brightness Distribution, Heao 2, Red Shift, Star Distribution
Scientific paper
BL Lac objects, extracted from the Einstein Extended Medium Sensitivity Survey (EMSS), are examined. X-ray selection proved to be a powerful tool to find new BL Lacs, and allows the creation of complete, well defined and sizable samples. X-ray selected BL Lac objects (XBL) have in general more starlight in the optical spectra than radio selected BL Lacs. Redshifts for a significant fraction of objects in samples of XBL can be determined. It is thus possible to study the cosmological properties of BL Lac objects. Different models of luminosity functions of BL Lacs, including relativistic beaming, are considered and integrated over luminosity and redshift. The results are compared with the observed number-counts. The observed redshift distribution and the models' predictions are analyzed.
Gioia Isabella Maria
Maccacaro Tommaso
Morris Simon L.
Schild Rudy E.
Stocke John T.
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