Results 71 to 80 of about 16,751 (259)
Asca Observations of Blazars [PDF]
Highlights of Astronomy, 1998 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
Herschel-ATLAS: Blazars in the science demonstration phase field [PDF]
, 2010 To investigate the poorly constrained sub-mm counts and spectral properties of blazars we searched for these in the Herschel-ATLAS (H-ATLAS) science demonstration phase (SDP) survey catalog.
David Hughes
core +3 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
Proton Synchrotron Gamma-Rays and the Energy Crisis in Blazars [PDF]
Astrophysical Journal, 2020 The origin of high-energy emission in blazars jets (i.e., leptonic versus hadronic) has been a longstanding matter of debate. Here, we focus on one variant of hadronic models where proton synchrotron radiation accounts for the observed steady γ-ray ...
I. Liodakis, M. Petropoulou
semanticscholar +1 more source
The space density of z>4 blazars [PDF]
, 2019 High-redshift blazars are an important class of active galactic nuclei (AGN) that can provide an independent estimate of the supermassive black hole mass function in high-redshift radio-loud AGN without the bias due to absorption along the line of sight.
Dallacasa, Daniele +11 more
core +4 more sources
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
Testing the blazar spectral sequence: X-ray-selected blazars [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 11 figures and 6 tables.
Maraschi, L. +4 more
openaire +2 more sources
Characteristic Variability Timescales in the Gamma-Ray Power Spectra of Blazars [PDF]
Astrophysical Journal, 2019 Characteristic variability timescales in blazar γ-ray light curves can provide insights into the physical processes responsible for γ-ray variability. The power spectral density (PSD) is capable of revealing such timescales, which may appear as breaks or
J. Ryan +3 more
semanticscholar +1 more source
Doppler Factor Estimation for Fermi Blazars
Astrophysical Journal, 2020 In this work, we exploit the luminosity of the broad-line region (BLR) for 50 Fermi blazars through matching the coordinates between the Sloan Digital Sky Survey catalog, Fermi Large Area Telescope Third Source Catalog, and the Fermi Large Area Telescope
Lixia Zhang +4 more
semanticscholar +1 more source
Constraining the Limiting Brightness Temperature and Doppler Factors for the Largest Sample of Radio-bright Blazars [PDF]
Astrophysical Journal, 2018 Relativistic effects dominate the emission of blazar jets, complicating our understanding of their intrinsic properties. Although many methods have been proposed to account for them, the variability Doppler factor method has been shown to describe the ...
I. Liodakis +5 more
semanticscholar +1 more source