Results 51 to 60 of about 16,452 (194)

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

Canonical high-power blazars [PDF]

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

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

, 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, Abdo, Abdo, Abdo, Abdo, Abdo, Barth, Blandford, Błażejowski, Chen, Coppi, Dermer, Falomo, Fan, Fan, Georganopoulos, Ghisellini, Ghisellini, Hartman, Huang, J. M. Bai, Liang Chen, Liu, Scarpa, Sikora, Sikora, Tavecchio, Wang, Woo, Xie, Xie, Xu, Yuan   +32 more
core   +1 more source

Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background [PDF]

, 2012
We place new constraints on the contribution of blazars to the large-scale isotropic gamma-ray background (IGRB) by jointly analyzing the measured source count distribution (logN-logS) of blazars and the measured intensity and anisotropy of the IGRB.
Cuoco, Alessandro, Komatsu, Eiichiro, Siegal-Gaskins, Jennifer   +2 more
core   +2 more sources

EGRET (GeV) Blazars

AIP 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

Multi-messenger emission characteristics of blazars

Frontiers in Astronomy and Space Sciences
Multi-messenger observations and theories of astrophysical objects are rapidly becoming a critical research area in the astrophysics scientific community. In particular, point-like objects such as BL Lacertae (BL Lac) objects, flat-spectrum radio quasars
Ronald Gamble, Ronald Gamble, Ronald Gamble, Jordan Forman, Amethyst Barnes, Gokul Srinivasaragavan, Gokul Srinivasaragavan, Isiah Holt, Isiah Holt, Marvin Jones, Marvin Jones   +10 more
doaj   +1 more source

Two new catalogs of blazar candidates in the WISE infrared sky [PDF]

, 2019
We present two catalogs of radio-loud candidate blazars whose WISE mid-infrared colors are selected to be consistent with the colors of confirmed gamma-ray emitting blazars.
Campana, Riccardo, Chavushyan, Vahram, Crespo, Nuria Alvarez, D'Abrusco, Raffaele, La Franca, Fabio, Landoni, Marco, Masetti, Nicola, Massaro, Francesco, Milisavljevic, Dan, Paggi, Alessandro, Ricci, Federica, Smith, Howard A.   +11 more
core   +2 more sources

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

Universe
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

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, Anton Strigachev, Evgeni Semkov, Rosa Victoria Muñoz Dimitrova, Georgi Latev, Borislav Spassov, Blagovest Petrov   +6 more
doaj   +1 more source

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

The 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, L. Marcotulli, K. Labrie, S. Marchesi, M. Ajello   +4 more
doaj   +1 more source