NASA NTRS · 19870026014
The properties of X-ray selected BL Lac objects
Abstract
The optical and radio properties of the X-ray-selected BL Lacs in the Einstein Medium sensitivity Survey (EMSS) are presented and compared with those of the HEAO 1 A-2 sample and with those of radio-selected BL Lacs. Definite redshifts are determined for two of four EMSS BL Lacs and a probable redshift if determined for a third. The number-flux relation of BL Lacs is found to show a drastic flattening below fluxes of order 10 to the -12th erg/sq cm/s; this is interpreted as evidence that BL Lac do not share the evolutionary properties of quasars.
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Maccacaro, T., Gioia, I. M., Maccagni, D., Stocke, J. T.. 1986-01-01. The properties of X-ray selected BL Lac objects. https://ntrs.nasa.gov/citations/19870026014
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