A multizone view on the multiwavelength emission of blazars

Author:

Liu Ruo-Yu12ORCID,Xue Rui3ORCID,Wang Ze-Rui4,Tan Hong-Bin12,Böttcher Markus5

Affiliation:

1. School of Astronomy and Space Science, Nanjing University , Nanjing 210023 , China

2. Key laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education , Nanjing 210023 , China

3. Department of Physics, Zhejiang Normal University , Jinhua 321004 , China

4. College of Physics and Electronic Engineering, Qilu Normal University , Jinan 250200 , China

5. Centre for Space Research, North-West University , Potchefstroom 2520 , South Africa

Abstract

ABSTRACT In this work, a time-dependent modelling is developed to study the emission properties of blazars in the low state. Motivated by various observations, we speculate and assume that numerous discrete radiation zones throughout the jet of a blazar contribute to the broad-band emission. We model the temporal evolution of the electron spectrum in each emission zone taking into account the injection, cooling, and escape of relativistic electrons. By doing so, we are able to calculate the multiwavelength emission of each radiation zone. The observed emission of a blazar is then the superposition of the emission from all discrete radiation zones. We revisit the multiwavelength spectral energy distributions, light curves, and polarization under the model, and discuss its potential to reproduce the flat radio spectra, the core-shift phenomena, the minute-scale gamma-ray variability, and the large polarization-angle swings, which are difficult to explain under the conventional one-zone models simultaneously.

Funder

NSFC

Department of Science and Technology of Shandong Province

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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