Stochastic acceleration in Extreme TeV BL Lacs through MCMC
arXiv:2403.01908 · doi:10.1051/0004-6361/202449870
Abstract
Extreme TeV BL Lacs are a class of blazars with unique spectral and temporal features, not easily reproducible using standard one-zone models based on single shock acceleration. To account for their peculiar properties we elaborated a two-steps acceleration model where a recollimation shock and the subsequent downstream turbulence energize non-thermal electrons. We apply the model to a sample of Extreme TeV BL Lacs with well characterized spectral energy distributions. Since we are considering several sources, we automatized the exploration of the parameter space. This also allows us to derive the parameter distributions and to study the correlations among them. We numerically solved a system of two coupled non-linear differential equations to obtain the non-thermal particles and turbulence spectra. We calculated the spectral energy distribution via the Synchrotron Self-Compton emission model. The automatization of the parameter space exploration is possible through a Markov Chain Monte Carlo (MCMC) ensemble sampler, in our case emcee. We derived well defined posterior distributions for the parameters, showing that the model is well constrained by available data and supporting the suitability of our method. The cross-correlations among some of the physical parameters are not trivial, therefore we conclude that MCMC sampling is a key instrument to characterize the complexity of our multi-parametric phenomenological model.
9 pages, 16 figures, accepted for publication in A&A
References in corpus (28)
- emcee: The MCMC Hammer
- A theoretical unifying scheme for gamma-ray bright blazars
- Relativistic Jets in Active Galactic Nuclei
- Leptonic and Hadronic Modeling of Fermi-Detected Blazars
- General physical properties of bright Fermi blazars
- Constraints on the Physical Parameters of TeV Blazars
- Particle Acceleration in Relativistic Magnetized Collisionless Electron-Ion Shocks
- The Fermi blazar sequence
- A hadronic origin for ultra-high-frequency-peaked BL Lac objects
- Extreme synchrotron BL Lac objects
- A new interpretation of the gamma-ray observations of active galactic nuclei
- Relativistic Jets in Active Galactic Nuclei und Microquasars
- Formation of hard VHE gamma-ray spectra of blazars due to internal photon-photon absorption
- Formation of hard very-high energy spectra of blazars in leptonic models
- The NuSTAR view on Hard-TeV BL Lacs
- A Particle Module for the PLUTO code: II - Hybrid Framework for Modeling Non-thermal emission from Relativistic Magnetized flows
- The Hard VHE Gamma-ray Emission in High-Redshift TeV Blazars: Comptonization of Cosmic Microwave Background Radiation in an Extended Jet?
- Progress in unveiling extreme particle acceleration in persistent astrophysical jets
- Magnetic Field Amplification and Saturation in Turbulence Behind a Relativistic Shock
- Reconfinement and Loss of Stability in Jets from Active Galactic Nuclei
- Simulating the dynamics and synchrotron emission from relativistic jets II. Evolution of non-thermal electrons
- Electron-proton co-acceleration on relativistic shocks in extreme-TeV blazars
- Magnetic inhibition of the recollimation instability in relativistic jets
- Fundamental physics with blazar spectra: a critical appraisal
- LeHaMoC: a versatile time-dependent lepto-hadronic modeling code for high-energy astrophysical sources
- Extreme blazars: the result of unstable recollimated jets?
- Stochastic Gyroresonant Acceleration for Hard Electron Spectra of Blazars: Effect of Damping of Cascading Turbulence
- Extreme TeV BL Lacs: a self-consistent stochastic acceleration model