Extreme blazars

@inproceedings{Ghisellini2003ExtremeB,
  title={Extreme blazars},
  author={Gabriele Ghisellini},
  year={2003}
}
TeV emission can be a common characteristic of low power blazars. This is in line with the sequence of blazars relating the observed bolometric luminosity with their overall spectral energy distribution. Detecting new TeV blazars, possibly at different redshifts, is important for studying the particle acceleration process operating in the jet, and it is even more important for studying the far infrared–optical background. Recent studies of low power BL Lacs suggest that the particle… 

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References

SHOWING 1-10 OF 35 REFERENCES
Multiwavelength Observations of Markarian 421 During a TeV/X-Ray Flare: Erratum
A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of
A theoretical unifying scheme for gamma-ray bright blazars
ABSTRA C T The phenomenology of g-ray bright blazars can be accounted for by a sequence in the source power and intensity of the diffuse radiation field surrounding the relativistic jet.
Bulk Acceleration in Relativistic Jets and the Spectral Properties of Blazars
Models for the synchrotron and inverse Compton emission from relativistic jets with bulk acceleration are studied, under the assumption that the bulk velocity increases with increasing distance along
Internal shocks in blazar jets
The discovery of strong γ–ray and hard X–ray emission and the results from various multifrequency campaigns have disclosed new aspects of the blazar phenomenology, leading to a much more robust
BeppoSAX Observations of Unprecedented Synchrotron Activity in the BL Lacertae Object Markarian 501
The BL Lacertae object Markarian 501, one of only three extragalactic sources (with Mrk 421 and 1ES 2344+514) so far detected at TeV energies, was observed with the BeppoSAX satellite in 1997 April
Intraday Variability in Quasars and BL LAC Objects
Active galactic nuclei with flat radio spectra exhibit significant variations of continuum flux density on time scales of days or less throughout the entire wavelength range. These rapid variations
Hard X-ray properties of blazars
We have considered all blazars observed in the X{ray band and for which the slope of the X{ray spectrum is available. We have collected 421 spectra of 268 blazars, including 12 archival unpublished
A jet model for the gamma-ray emitting blazar 3C 279
The physical conditions in the gamma-ray-emitting blazar 3C 279 are discussed. The requirement of transparency for gamma-rays, together with the observation of rapid variability, imply that the
A unifying view of the spectral energy distributions of blazars
ABSTRA C T We collect data at well-sampled frequencies from the radio to the g-ray range for the following three complete samples of blazars: the Slew survey, the 1-Jy samples of BL Lacs and the 2-Jy
X-Ray Emission of Markarian 421: New Clues from Its Spectral Evolution. I. Temporal Analysis
Mrk 421 was repeatedly observed with BeppoSAX in 1997 and 1998. This is the first of two papers where we present the results of a thorough temporal and spectral analysis of all the data available to
...
1
2
3
4
...