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The properties of X-ray selected BL Lac objectsThe 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.
Document ID
19870026014
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Maccacaro, T. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Gioia, I. M. (Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Bologna, Universita Italy)
Maccagni, D. (CNR Istituto di Fisica Cosmica e Technologie Alternative, Milan, Italy)
Stocke, J. T. (Steward Observatory Tucson, AZ, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
Astrophysics
Accession Number
87A13288
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
CONTRACT_GRANT: NAG8-442
Distribution Limits
Public
Copyright
Other

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