Results 41 to 50 of about 24,339 (257)
BL Lac Contribution to the Extragalactic Gamma-Ray Background [PDF]
, 2007 Very high energy gamma-rays from blazars traversing cosmological distances through the metagalactic radiation field can convert into electron-positron pairs in photon-photon collisions. The converted gamma-rays initiate electromagnetic cascades driven by
Aharonian +37 more
core +2 more sources
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
General Physical Properties of Fermi Blazars
The Astrophysical Journal Supplement Series, 2023 We study the general physical properties of Fermi blazars using the Fermi fourth source catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength data of Fermi blazars are fitted by using the one-zone leptonic model to obtain some physical ...
Yongyun Chen +8 more
doaj +1 more source
Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS) [PDF]
, 2007 We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude below the MOJAVE survey and most other samples that have been used to study ...
A. C. S. Readhead +16 more
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
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
Short Term Flux and Colour Variations in Low-Energy Peaked Blazars [PDF]
, 2010 We have measured multi-band optical flux and colour variations for a sample of 12 low energy peaked blazars on short, day-to-month, timescales. Our sample contains six BL Lacertae objects and six flat spectrum radio quasars.
Bachev, R. +13 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
Connection Between Optical and VHE Gamma-ray Emission in Blazar Jets
, 2011 MAGIC has been performing optically triggered Target of Opportunity observations of flaring blazars since the beginning of its scientific operations.
Aimo Sillanpää +7 more
core +1 more source
, 2014 We present an analysis of the optical spectra available in the Sloan Digital Sky survey data release nine (SDSS DR9) for the blazars listed in the ROMA-BZCAT and for the gamma-ray blazar candidates selected according to their IR colors. First, we adopt a
, +9 more
core +2 more sources