Results 41 to 50 of about 6,255 (211)
An optical and infrared study of blazars [PDF]
This thesis presents a study of some of the optical and infrared properties of blazars. A review of previous observations of blazars is given. The evidence for bulk relativistic flows in quasars and blazars is also discussed. The observational study has
Mead, Andrew Robert Graham
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The Blazar Sequence and Its Physical Understanding
Introduced in 1998 to attempt a first unified view of the broad-band emission properties of blazars, the blazar sequence has been extensively used in the past 25 years to guide observations as well as the physical interpretation of the overall emission ...
Elisa Prandini, Gabriele Ghisellini
doaj +1 more source
Discovery of Hidden Blazars [PDF]
Every radio-loud quasar may have blazar activities, according to a unified scheme where the differences in both optical and radio observations of radio-loud quasars are the result of different viewing angles. We have predicted that blazars may be detected using emission line ratio variations caused by variable illumination of gas clouds in the broad ...
Ma, Feng, Wills, Beverley J.
openaire +3 more sources
The CLASS blazar survey: testing the blazar sequence [PDF]
We discuss the properties of the sources in the CLASS Blazar survey which aims at the selection of low radio power (P(5GHz)<10^25 W Hz^-1) blazars. We use VLA data from available catalogues and from our own observations to constrain the radio core-dominance of the sample which, together with the flat radio spectral index, is a signature of the ...
Caccianiga, A., Marchã, M. J. M.
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FLARING PATTERNS IN BLAZARS [PDF]
6 pages, 3 figures, accepted for publication in The Astrophysical ...
Paggi, A. +4 more
openaire +2 more sources
Blazars are observed to emit non-thermal radiation across the entire electromagnetic spectrum from the radio to the very-high-energy γ-ray region. The broadband radiation measured from a blazar is dominated by emission from a relativistic plasma jet ...
Krishna Kumar Singh +4 more
doaj +1 more source
Near infrared polarimetry of a sample of blazars*
Polarization variability is one of the most ubiquitous characteristic of blazars. Near infrared (NIR)polarization measurements of blazars are not common, contrary to the optical ones.
Pulido J. A. Acosta +8 more
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Relativistic Jets of Blazars [PDF]
Relativistic jets of active galactic nuclei have been known to exist for 100 years. Blazars with their jet pointing close to our line of sight are some of the most variable and extreme objects in the universe, showing emission from radio to very-high ...
Lindfors, Elina, Hovatta, Talvikki
core +1 more source
International audienceThe uncharted territory of the high-redshift (z ≳ 3) universe holds the key to understanding the evolution of quasars. In an attempt to identify the most extreme members of the quasar population, that is, blazars, we have carried ...
Cao, H.-M. +7 more
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Asca Observations of Blazars [PDF]
During the last years it has become evident that blazar class of AGN emit a lot of energy in the gamma-ray regime. It is generally thought that the non-thermal emission from blazars, observed from radio to GeV/TeV 7-rays, is radiation of very energetic particles via both synchrotron and Compton processes.
T. Takahashi, H. Kubo, G. Madejski
openaire +1 more source

