On leptonic models for blazars in the Fermi era

TL;DR

This paper reviews leptonic models for blazars in light of Fermi-LAT data, addressing spectral features, emission site locations, and model fitting challenges for TeV blazars.

Contribution

It summarizes key questions raised by Fermi data and explores solutions within leptonic models, highlighting current challenges and uncertainties.

Findings

GeV spectral breaks' possible origins discussed

Locations of gamma-ray emission sites analyzed

Difficulties in fitting TeV blazar spectra with synchrotron/SSC models

Abstract

Some questions raised by Fermi-LAT data about blazars are summarized, along with attempts at solutions within the context of leptonic models. These include both spectral and statistical questions, including the origin of the GeV breaks in low-synchrotron peaked blazars, the location of the gamma-ray emission sites, the correlations in the spectral energy distributions with luminosity, and the difficulty of synchrotron/SSC models to fit the spectra of some TeV blazars.