Attenuation of TeV γ-rays by the starlight photon field of the host galaxy

Zacharias, M.; Chen, Xuhui; Wagner, S. J.

doi:10.1093/mnras/stw3032

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…In fact, the optical depths for such absorption process are predicted to be rather low (see e.g. Stawarz et al 2006, Zacharias, Chen & Wagner 2016.…”

Section: Discussionmentioning

confidence: 99%

Morphology of TeV Gamma-Ray Emission from the Kiloparsec-scale Jets in Radio Galaxies

Bednarek¹

2020

ApJ

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TeV γ rays are observed from a few nearby radio galaxies whose jets are viewed at relatively large angles towards the observer. This emission can be produced in the kpc scale jets whose Lorentz factors are decelerated from values of the order of several at the parsec scale distances. We consider in detail the model in which TeV γ-ray emission is produced by the relativistic electrons in the kpc scale jet which comptonize strongly beamed radiation from the inner (parsec scale) jet. As an example, we study morphology of the TeV γ-ray emission from the decelerated kpc scale jet in the nearby radio galaxy Cen A. It is shown that TeV γ-ray emission can extend throughout the kpc scale distances, being relatively smoothly distributed along the jet for some parameters of the considered model. Investigation of the morphological structure of such specific γ-ray emission by the future Cherenkov Telescope Array (e.g. CTA) should provide important constraints on the content and dynamics of the kpc scale jet in Cen A.

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“…In fact, the optical depths for such absorption process are predicted to be rather low (see e.g. Stawarz et al 2006, Zacharias, Chen & Wagner 2016.…”

Section: Discussionmentioning

confidence: 99%

Morphology of TeV Gamma-Ray Emission from the Kiloparsec-scale Jets in Radio Galaxies

Bednarek¹

2020

ApJ

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“…While its influence on the total spectrum through IC emission is minor (cf., Potter & Cotter 2013b) in most cases (even though it may play a role in Centaurus A, H.E.S.S. Collaboration et al 2020), the host galaxy light may serve as a target for γ-ray absorption at TeV energies, which could be observable with the future Cherenkov Telescope Array (Zacharias et al 2017a). We also plan to include a more realistic particle acceleration scenario to go beyond the current simplistic injection of the same power-law shape in each slice.…”

Section: Discussionmentioning

confidence: 99%

ExHaLe-jet: An extended hadro-leptonic jet model for blazars. I. Code description and initial results

Zacharias,

Reimer,

Boisson

et al. 2022

Preprint

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The processes operating in blazar jets are still an open question. Modeling the radiation emanating from an extended part of the jet allows one to capture these processes on all scales. Kinetic codes solving the Fokker-Planck equation along the jet flow are well suited to this task, as they can efficiently derive the radiation and particle spectra without the need for computationally demanding plasma-physical simulations. Here, we present a new extended hadro-leptonic jet code -ExHaLe-jet -which considers simultaneously the processes of relativistic protons and electrons. Within a pre-set geometry and bulk flow, the particle evolution is derived self-consistently. Highly relativistic secondary electrons (and positrons) are created through γ-γ pair production, Bethe-Heitler pair production, and pion/muon decay. These secondaries are entrained in the jet flow decreasing the ratio of protons to electrons with distance from the jet base. For particle-photon interactions, we consider all internal and many external photon fields, such as the accretion disk, broad-line region, and the dusty torus. The external fields turn out to be the most important source for particle-photon interactions governing the resulting photon and neutrino spectra. In this paper, we present the code and an initial parameter study, while in follow-up works we present extensions of the code and more specific applications.

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“…Potter & Cotter 2013b ) in most cases (even though it may play a role in Centaurus A; H.E.S.S. Collaboration 2020 ), the host galaxy light may serve as a target for γ -ray absorption at TeV energies, which could be observable with the future Cherenkov Telescope Array (Zacharias, Chen & Wagner 2017a ). We also plan to include a more realistic particle acceleration scenario to go beyond the current simplistic injection of the same power-law shape in each slice.…”

Section: S U M M a Ry A N D O U T L O O Kmentioning

confidence: 99%

ExHaLe-jet: an extended hadro-leptonic jet model for blazars – I. Code description and initial results

Zacharias

Reimer

Boisson

et al. 2022

Monthly Notices of the Royal Astronomical Society

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The processes operating in blazar jets are still an open question. Modelling the radiation emanating from an extended part of the jet allows one to capture these processes on all scales. Kinetic codes solving the Fokker–Planck equation along the jet flow are well suited to this task, as they can efficiently derive the radiation and particle spectra without the need for computationally demanding plasma physical simulations. Here, we present a new extended hadro-leptonic jet code – ExHaLe-jet– which considers simultaneously the processes of relativistic protons and electrons. Within a pre-set geometry and bulk flow, the particle evolution is derived self-consistently. Highly relativistic secondary electrons (and positrons) are created through γ–γ pair production, Bethe–Heitler pair production, and pion/muon decay. These secondaries are entrained in the jet flow decreasing the ratio of protons to electrons with distance from the jet base. For particle–photon interactions, we consider all internal and many external photon fields, such as the accretion disc, broad-line region, and the dusty torus. The external fields turn out to be the most important source for particle–photon interactions governing the resulting photon and neutrino spectra. In this paper, we present the code and an initial parameter study, while in follow-up works we present extensions of the code and more specific applications.

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Attenuation of TeV γ-rays by the starlight photon field of the host galaxy

Cited by 4 publications

References 21 publications

Morphology of TeV Gamma-Ray Emission from the Kiloparsec-scale Jets in Radio Galaxies

Morphology of TeV Gamma-Ray Emission from the Kiloparsec-scale Jets in Radio Galaxies

ExHaLe-jet: An extended hadro-leptonic jet model for blazars. I. Code description and initial results

ExHaLe-jet: an extended hadro-leptonic jet model for blazars – I. Code description and initial results

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