Results 11 to 20 of about 18,989 (273)
Astrophysical Neutrinos and Blazars [PDF]
Universe, 2021 We review and discuss recent results on the search for correlations between astrophysical neutrinos and γ-ray-detected sources, with many extragalactic studies reporting potential associations with different types of blazars.
P. Giommi, P. Padovani
semanticscholar +6 more sources
Blazars at the Cosmic Dawn [PDF]
The Astrophysical Journal, 2020 The uncharted territory of the high-redshift (z ≳ 3) universe holds the key to understanding the evolution of quasars. In an attempt to identify the most extreme members of the quasar population, that is, blazars, we have carried out a multiwavelength ...
V. Paliya +7 more
semanticscholar +7 more sources
Origin of Blazar Activity [PDF]
Symposium - International Astronomical Union, 1999 Models of Blazars based on the propagation of finite discontinuities or fronts in the Poynting flux jet from the innermost regions of an accretion disk around a black hole are discussed. Such fronts may be responsible for short time–scale (from less than hours to days) flares in different wavebands from high frequency radioband to TeV, with delay in ...
M. M. Romanova
openalex +4 more sources
Characterizing Long-term Optical Variability Properties of γ-Ray-bright Blazars [PDF]
Astrophysical Journal, 2021 Optical observations of a sample of 12 γ-ray-bright blazars from four optical data archives—American Association of Variable Star Observers, Small and Moderate Aperture Research Telescope System, Catalina, and Steward Observatory—are compiled to create ...
G. Bhatta
semanticscholar +1 more source
Classification of unassociated fermi-LAT sources [PDF]
ITM Web of Conferences, 2022 The Large Area Telescope (LAT) on board NASA’s Fermi Gamma-ray Space telescope has detected 5788 sources in the 4FGL catalogue. Among them, 271 have been associated to pulsars, 3436 to blazars, and 1782 remain unassociated sources.
Meng Qiyu
doaj +1 more source
An Optical Overview of Blazars with LAMOST. I. Hunting Changing-look Blazars and New Redshift Estimates [PDF]
, 2021 The extragalactic γ-rays sky observed by the Fermi Large Area Telescope (LAT) is dominated by blazars. In the fourth release of the Fermi LAT Point Source Catalog (4FGL) are sources showing a multifrequency behavior similar to that of blazars but lacking
H. Peña-Herazo +8 more
semanticscholar +1 more source
The Spectral Energy Distributions for 4FGL Blazars
Astrophysical Journal Supplement Series, 2022 In this paper, the multiwavelength data from radio to X-ray bands for 2709 blazars in the 4FGL-DR3 catalog are compiled to calculate their spectral energy distributions using a parabolic equation log(νfν)=P1logν−P22+P3 .
J. H. Yang +21 more
semanticscholar +1 more source
The Astrophysical Journal, 2023 Recent works have developed samples of blazars from among the Fermi Large Area Telescope unassociated sources via machine-learning comparisons with known blazar samples. Continued analysis of these new blazars tests the predictions of the blazar sequence
Stephen Kerby, Abraham D. Falcone
doaj +1 more source
The recognition of blazars and the blazar spectral sequence [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 Accepted for publication in ...
Ian Browne, Sonia Anton, Sonia Anton
openaire +3 more sources
The blazar sequence revised [PDF]
Astronomische Nachrichten, 2021 We propose and test a fairly simple idea that could account for the blazar sequence: all jets are launched with similar energy per baryon, independently of their power. For instance, flat‐spectrum radio quasars (FSRQs), the most powerful jets, manage to accelerate to high bulk Lorentz factor, as observed in the radio.
Dimitrios Giannios +2 more
openaire +3 more sources