Spectral properties of blazars. I - Objects observed in the far-ultraviolet. II - an X-ray observed sample

Details Spectral properties of blazars. I - Objects observed in the far-ultraviolet. II - an X-ray observed sample Spectral properties of blazars. I - Objects observed in the far-ultraviolet. II - an X-ray observed sample

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..317g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. 317-333.

Astronomy and Astrophysics

Astronomy

94

Astronomical Spectroscopy, Bl Lacertae Objects, Blazars, Spaceborne Astronomy, Ultraviolet Astronomy, Astronomical Catalogs, Far Ultraviolet Radiation, Quasars, X Ray Astronomy

Scientific paper

All blazars observed with the IUE are studied and shown to form a well-defined subgroup according to their spectral properties. These properties are discussed with respect to theoretical models and are compared with those of quasars. Radio, ultraviolet, and X-ray fluxes are used to construct composite spectral indices, and systematic differences between X-ray selected and otherwise selected objects are discussed. It is confirmed that X-ray selected objects have flatter overall spectra, and are therefore weaker radio emitters relative to their X-ray emission than objects selected otherwise. It is found that X-ray selected blazars have the same average X-ray luminosity as blazars selected otherwise and are underluminous at UV and radio frequencies. This finding is used to argue that the radio-weak, X-ray selected BL Lac objects are, in terms of space density, the dominant members of the blazar population. The results are interpreted in the framework of synchrotron emission models involving relativistic plasma jets.

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