scholarly journals STUDY OF BLAZAR ACTIVITY IN 10 YEAR FERMI-LAT DATA AND IMPLICATIONS FOR TEV NEUTRINO EXPECTATIONS

2021 ◽  
Vol 57 (2) ◽  
pp. 251-268
Author(s):  
J. R. Sacahui ◽  
A. V. Penacchioni ◽  
A. Marinelli ◽  
A. Sharma ◽  
M. Castro ◽  
...  
Keyword(s):  
Duty Cycle ◽  
Gamma Ray ◽  
Active State ◽  
Light Curves ◽  
Neutrino Emission ◽  
Extragalactic Background Light ◽  
Background Light

Blazars are the most active extragalactic gamma-ray sources. They show sporadic bursts of activity, lasting from hours to months. In this work we present a 10-year analysis of a sample of bright sources detected by Fermi-LAT (100 MeV - 300 GeV). Using 2-week binned light curves (LC) we estimate the duty cycle (DC): fraction of time that the source spends in an active state. The objects show different DC values, with an average of 22.74% and 23.08% when considering (or not) the extragalactic background light ( EBL). Additionally, we study the so-called “blazar sequence” trend for the sample of selected blazars in the ten years of data. This analysis constrains a possible counterpart of sub-PeV neutrino emission during the quiescent states, leaving open the possibility to explain the observed IceCube signal during the flaring states.

Chapter 3 Extra-galactic Gamma-Ray Sources

2021 ◽  
Author(s):  
Xiang-Yu Wang
Keyword(s):  
Active Galactic Nuclei ◽  
Lower Energy ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
Starburst Galaxies ◽  
Gamma Ray Bursts ◽  
Cherenkov Detector ◽  
Extragalactic Background Light ◽  
Background Light ◽  
Water Cherenkov Detector

Abstract Extra-galactic gamma-ray sources, such as gamma-ray bursts, active galactic nuclei, starburst galaxies, are interesting and important targets for LHAASO observations. In this chapter, the prospects of detecting these sources with LHAASO and their physical implications are studied. The upgrade plan for the Water Cherenkov Detector Array (WCDA), which aims to enhance the detectability of relatively lower energy photons, is also presented. In addition, a study on constraining the extragalactic background light with LHAASO observation of blazars is presented.

scholarly journals Gamma-ray Spectra and the Extragalactic Background Light

2012 ◽  
Vol 355 ◽  
pp. 012026
Author(s):  
Rudy Gilmore ◽  
Rachel Somerville ◽  
Joel Primack ◽  
Alberto Domínguez
Keyword(s):  
Gamma Ray ◽  
Extragalactic Background Light ◽  
Background Light

scholarly journals Extragalactic background light: Constraints from the TeV gamma-ray observations

2020 ◽  
Vol 1468 ◽  
pp. 012088
Author(s):  
V.G. Sinitsyna ◽  
V.Y. Sinitsyna ◽  
S.S. Borisov ◽  
K.A. Balygin ◽  
A.I. Klimov ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Extragalactic Background Light ◽  
Background Light

scholarly journals The intrinsic gamma-ray spectrum of TXS 0506+056: intergalactic propagation effects

2020 ◽  
Vol 500 (2) ◽  
pp. 2188-2195
Author(s):  
Andrey Saveliev ◽  
Rafael Alves Batista
Keyword(s):  
Gamma Ray ◽  
Recent Observation ◽  
High Energy ◽  
Spectral Energy ◽  
Electromagnetic Spectrum ◽  
Extragalactic Background Light ◽  
Background Light ◽  
Propagation Effects ◽  
Very High Energy ◽  
Energy Gamma

ABSTRACT The recent observation of high-energy neutrinos from the 2017 flare of the blazar TXS 0506+056, together with counterparts across the whole electromagnetic spectrum, opens up new possibilities for investigating the properties of this class of objects as well as the traversed medium. Propagation effects such as the attenuation of the very-high-energy gamma-ray component by the extragalactic background light are well known, and usually taken into account when fitting spectral energy distributions of objects. Other effects such as those of intergalactic magnetic fields are, however, often neglected. In this work, we present a comprehensive study of the influence of these fields and the extragalactic background light on the determination of the intrinsic gamma-ray spectrum of this blazar.

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