Variability of Blazars and Blazar Models over 38 Years
نویسندگان
چکیده
منابع مشابه
Variability of Blazars and Blazar Models over 38 Years
Since 1978, when BL Lac objects and violently variable quasars were married to become “blazars”, physical interpretations of the phenomenon have evolved. Remarkably, though, the general picture of relativistic jets beaming their radiation in our direction, proposed that year by Blandford and Rees, remains intact. The main stress on theoretical models has come from observations that reveal ever ...
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Nearly simultaneous multiband monitoring of blazars is very limited and most studies reported in literature are conflicting, too. Although optical variability on intra-night timescales is now a well established phenomenon for blazars, its relationship to long-term variability remains unclear. Possible clues could come from monitoring the optical spectrum for correlation with brightness. The pr...
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Much observational efforts have been devoted in recent years to study blazar variability across the electromagnetic spectrum (for a recent review see e.g., Ulrich, et al. 1997). In addition to spectral and polarization information, variability data can provide stringent constraints on the radiation mechanisms, the geometry of the emission regions, beaming factors, formation and dynamics of shoc...
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We analyse a group of radio sources, a subset of the 200 mJy sample, all of which have core-jet radio structures measured with VLBI and have flat spectra stretching from the radio to the millimetre/sub-millimetre band. Thus the objects have most of the properties expected of blazars. However, they display varied optical properties ranging from “Seyfert-like” objects, through BL Lac objects, to ...
متن کاملLeptonic Jet Models of Blazars: Broadband Spectra and Spectral Variability
The current status of leptonic jet models for gamma-ray blazars is reviewed. Differences between the quasar and BL-Lac subclasses of blazars may be understood in terms of the dominance of different radiation mechanisms in the gamma-ray regime. Spectral variability patterns of different blazar subclasses appear to be significantly different and require different intrinsic mechanisms causing gamm...
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ژورنال
عنوان ژورنال: Galaxies
سال: 2016
ISSN: 2075-4434
DOI: 10.3390/galaxies4040037