Study of Blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations

TL;DR

This study analyzes 10 years of Fermi-LAT data on bright blazars to determine their activity patterns, duty cycles, and potential links to TeV neutrino emissions, providing insights into their behavior and neutrino expectations.

Contribution

It offers a comprehensive 10-year analysis of blazar activity, duty cycles, and their implications for TeV neutrino emission, highlighting the variability and potential neutrino counterparts.

Findings

Average duty cycle around 23% for blazars.

Different duty cycle values among sources.

Constraints on neutrino emission during quiescent states.

Abstract

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 lightcurves (LC) we estimated the Duty Cycle (DC): fraction of time that the source spends in an active state. The objects present different DC values, with an average of $22.74\%$ and $23.08 \%$ when considering (and 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 the possibility to explain the observed IceCube signal during the flaring states.