Variability of Blazars
E. VALTAOJA (Ed), Mauri Valtonen
Cambridge University Press, 1992 - Science - 465 pages
Blazars (also known as BL Lac objects), first discovered in 1978, are unusually energetic objects in the extragalactic universe. About 200 are known or suspected. They are radio sources with highly variable optical and radio emission, as well as high polarization, and their optical spectra normally have no distinguishable features. It is generally accepted that they belong to that class of galaxies with active galactic nuclei, which are presumed to be driven by infall of matter to a supermassive black hole. In this book researchers give a complete summary of the observations of blazars and the theoretical interpretation. A comprehensive listing of confirmed and candidate objects is included. Mechanisms in which the variability can arise from shocks and relativistic jets are discussed. There are at least four different answers given to the question: what is a blazar? This book is a complete overview of the violent activity observed in these extreme active galactic nuclei.
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First Detection of Nightly Variations in the Frequency Dependent
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A Study of Long Term Variability of Blazars in Multifrequency Spectral
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accretion disk active galactic nuclei Aller amplitude analysis Astron Astrophys Astrophysics Baath band beam behaviour Belokon BL Lac objects BL Lacertae objects black hole Blandford blazars brightness Burbidge Cambridge continuum core correlation Courvoisier detected distribution Doppler electrons emission lines energy epochs evolution FDPA Figure flare flux density Gabuzda Impey infrared jet axis jet components Konigl Krichbaum light curves line of sight lOOGHz Lorentz factor LPQs luminosity Maccacaro magnetic field maps Maraschi Marscher Metsahovi milliarcsecond monitoring outburst parameters peak Pearson period polarization position angle power law properties quasars Quirrenbach radiation radio galaxies radio jet radio sources rapid variability redshift relativistic jet rotation sample scale Schalinski shows Sillanpaa spectral index spectrum structure functions superluminal motion Takalo telescope timescales total flux Tuorla Observatory Unwin Valtaoja variable sources variations velocity viewing angle VLBI VLBI observations wavelength Witzel X-ray