22-30 July 2021
North-West University
Africa/Johannesburg timezone
More Information Coming Soon

Simulations of Stochastic Long-Term Variability in Leptonic Models for External-Compton and Synchrotron Self-Compton Dominated Blazars

27 Jul 2021, 12:15
Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Oral Presentation Track D1 - Astrophysics Astrophysics


Hannes Thiersen (NWU)


In this talk we present an investigation into the nature of
multi-wavelength variability of blazars from a purely numerical approach.
We use a time-dependent one-zone leptonic blazar emission model to
simulate multi-wavelength variability by introducing stochastic parameter
variations in the emission region. These stochastic parameter variations
are generated by Monte Carlo methods and have a characteristic power law
index, $\alpha=-2$ in their power spectral densities (PSDs). We include
representative blazar test cases for a flat spectrum radio quasar (FSRQ)
and a high synchrotron peaked BL Lacertae object (HBL) for which the high
energy component of the Spectral Energy Distribution (SED) is dominated by
external Compton (EC) or synchrotron self-Compton (SSC) emission
respectively. The simulated variability is analyzed in order to
characterise the distinctions between the two blazar cases and the type of
progenitor variations. We show that the variability's power spectrum is
closely related to underlying progenitor variations for both cases.
Distinct differences between the different progenitor variations are
present in the multi-wavelength cross-correlation functions.

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Primary author

Hannes Thiersen (NWU)

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