Results 41 to 50 of about 23,536 (235)

Exploring the connection between radio and GeV-TeV gamma-ray emission in the 1FHL and 2FHL AGN samples [PDF]

open access: yes, 2017
The Fermi Large Area Telescope (LAT) revealed that blazars, representing the most extreme radio-loud active galactic nuclei (AGN) population, dominate the census of the gamma-ray sky, and a significant correlation was found between radio and gamma-ray ...
Costamante, L.   +6 more
core   +2 more sources

Asca Observations of Blazars [PDF]

open access: yesHighlights 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

Implications on the blazar sequence and inverse Compton models from Fermi bright blazars

open access: yes, 2011
In this paper, we use the quasi-simultaneous spectra of Fermi bright blazars and Fermi detected narrow line Seyfert 1 (NLS1) to study the blazar sequence and inverse Compton (IC) models. I.
Abdo   +32 more
core   +1 more source

Canonical high-power blazars [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2009
Revised version accepted for publication in ...
Ghisellini, G., Tavecchio, F.
openaire   +2 more sources

Long-Term Optical Monitoring of Blazars

open access: yesGalaxies, 2019
Systematic monitoring of specific targets in the optical regime was historically applied on a very narrow sample of known variable stars. The discovery of blazars in the 20th century brought to the foreground the need for new global sky surveys, covering
Kosmas Gazeas
doaj   +1 more source

EGRET (GeV) Blazars

open access: yesAIP Conference Proceedings, 2001
Invited review paper, to appear in the proceedings of the International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, June 2000, AIP Conference Proc.
openaire   +2 more sources

Identifying the 3FHL Catalog. VI. Results of the 2019 Gemini Optical Spectroscopy

open access: yesThe Astronomical Journal, 2023
Active galactic nuclei with their relativistic jets pointed toward the observer are a class of luminous gamma-ray sources commonly known as blazars. The study of this source class is essential to unveil the physical processes powering these extreme jets,
M. Rajagopal   +4 more
doaj   +1 more source

Study on the Gamma-Ray Radiation Properties of High-Redshift Blazars at z > 2.5

open access: yesUniverse
The high-redshift blazars are important cosmological probes for exploring the early universe and unraveling the fundamental emission processes and the structure of the active galactic nuclei.
Fan Wu, Li Zhang, Benzhong Dai
doaj   +1 more source

Collagen organisation in the fibrous joint capsules in the digits of the human hand

open access: yesJournal of Anatomy, EarlyView.
The function of the finger joints is important for daily life. In this review of the literature, we consider the role of collagen and its organization within the fibrous finger joint capsules of the interphalangeal (IP) joints and investigate the relationships between collagen orientation and joint function. Abstract Normal function of the hand and, in
Fiona R. Saunders   +3 more
wiley   +1 more source

Extreme Jet Beaming Observed in Neutrino-associated Blazars

open access: yesThe Astrophysical Journal
Bright blazars were found to be prominent neutrino sources, and a number of IceCube events were associated with them over recent years. A particularly strong observational connection is present between neutrinos and blazars with bright, Doppler-boosted ...
A. V. Plavin   +2 more
doaj   +1 more source

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