Results 51 to 60 of about 34,122 (236)
A new method to unveil blazars among multi-wavelength counterparts of Unassociated Fermi gamma-ray Sources [PDF]
, 2017 We discuss a new method for unveiling the possible blazar AGN nature among the numerous population of Unassociated Gamma-ray sources (UGS) in the Fermi catalogues.
Franceschini, Alberto +2 more
core +2 more sources
Astroparticle Physics, 1999 The kinetic energy of bulk relativistic plasma ejected from the central engine of blazars is converted into nonthermal particle energy in the comoving frame through a process of sweeping up material from the surrounding medium. The resulting deceleration of the bulk plasma introduces a number of effects which must be included in blazar modeling.
openaire +2 more sources
Hadronic blazar models and correlated X-ray/TeV flares [PDF]
, 2000 The hypothesis that AGN jets might be the sources of the ultra-high energy cosmic rays has originally motivated the venture of TeV gamma ray astronomy.
Rachen, Jorg P.
core +2 more sources
The Extremes in Intra-Night Blazar Variability: The S4 0954+65 Case
Galaxies, 2016 We present results of optical observations of the extremely violently variable blazar S4 0954+65 on intra-night time scales. The object showed flux changes of up to 100% within a few hours.
Rumen Bachev +6 more
doaj +1 more source
Blazar sequence - an artefact of Doppler boosting
, 2008 The blazar sequence is a scenario in which the bolometric luminosity of the blazar governs the appearance of its spectral energy distribution. The most prominent result is the significant negative correlation between the synchrotron peak frequencies and ...
Antón +34 more
core +1 more source
BLAZAR ANTI-SEQUENCE OF SPECTRAL VARIABILITY FOR INDIVIDUAL TeV BLAZARS [PDF]
International Journal of Modern Physics: Conference Series, 2013 We compile from literature the broadband SEDs of twelve TeV blazars observed simultaneously or quasi-simultaneously with Fermi/LAT and other instruments. Two SEDs are available for each of the objects and the state is identified as a low or high state according to its flux density at GeV/TeV band.
Zhang, Jin +2 more
openaire +2 more sources
Polarization Swings Reveal Magnetic Energy Dissipation in Blazars [PDF]
, 2015 The polarization signatures of the blazar emissions are known to be highly variable. In addition to small fluctuations of the polarization angle around a mean value, sometimes large (> 180^o) polarization angle swings are observed. We suggest that such p
Boettcher, Markus +4 more
core +3 more sources
The high energy X-ray probe (HEX-P): the most powerful jets through the lens of a superb X-ray eye
Frontiers in Astronomy and Space SciencesA fraction of the active supermassive black holes at the centers of galaxies in our Universe are capable of launching extreme kiloparsec-long relativistic jets.
Lea Marcotulli +29 more
doaj +1 more source
Blazar Flaring Rates Measured with GLAST
, 2003 We derive the minimum observing time scales to detect a blazar at a given flux level with the LAT on GLAST in the scanning and pointing modes. Based upon Phase 1 observations with EGRET, we predict the GLAST detection rate of blazar flares at different ...
B.L Dingus +8 more
core +2 more sources
Gamma-ray flares from red giant/jet interactions in AGN [PDF]
, 2010 Non-blazar AGN have been recently established as a class of gamma-ray sources. M87, a nearby representative of this class, show fast TeV variability on timescales of a few days. We suggest a scenario of flare gamma-ray emission in non-blazar AGN based on
Abdo +33 more
core +2 more sources