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

Bednarek, W.

doi:10.3847/1538-4357/ab774b

Cited by 3 publications

(2 citation statements)

References 46 publications

(44 reference statements)

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“…However in the radio galaxy Cen A, extended TeV emission has recently been reported [135], thanks to the unique proximity of the source. The estimated projected distance from the core is roughly a few kpc, although the real distance may be larger due to projection effects [136]. This observational result provides further evidence for the acceleration of ultra-relativistic electrons in radio jets and confirms their major role in the TeV emission and misaligned AGN.…”

Section: Soft γ-Ray To Tev Radiation In Integral Agnsupporting

confidence: 56%

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

et al. 2021

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Investigations that were carried out over the last two decades with novel and more sensitive instrumentation have dramatically improved our knowledge of the more violent physical processes taking place in galactic and extra-galactic Black-Holes, Neutron Stars, Supernova Remnants/Pulsar Wind Nebulae, and other regions of the Universe where relativistic acceleration processes are in place. In particular, simultaneous and/or combined observations with γ-ray satellites and ground based high-energy telescopes, have clarified the scenario of the mechanisms responsible for high energy photon emission by leptonic and hadronic accelerated particles in the presence of magnetic fields. Specifically, the European Space Agency INTEGRAL soft γ-ray observatory has detected more than 1000 sources in the soft γ-ray band, providing accurate positions, light curves and time resolved spectral data for them. Space observations with Fermi-LAT and observations that were carried out from the ground with H.E.S.S., MAGIC, VERITAS,and other telescopes sensitive in the GeV-TeV domain have, at the same time, provided evidence that a substantial fraction of the cosmic sources detected are emitting in the keV to TeV band via Synchrotron-Inverse Compton processes, in particular from stellar galactic BH systems as well as from distant black holes. In this work, employing a spatial cross correlation technique, we compare the INTEGRAL/IBIS and TeV all-sky data in search of secure or likely associations. Although this analysis is based on a subset of the INTEGRAL all-sky observations (1000 orbits), we find that there is a significant correlation: 39 objects (∼20% of the VHE γ-ray catalogue) show emission in both soft γ-ray and TeV wavebands. The full INTEGRAL database, now comprising almost 19 years of public data available, will represent an important legacy that will be useful for the Cherenkov Telescope Array (CTA) and other ground based large projects.

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Section: Soft γ-Ray To Tev Radiation In Integral Agnsupporting

confidence: 56%

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

et al. 2021

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“…However in the radio galaxy Cen A, extended TeV emission has recently been reported [136], thanks to the unique proximity of the source. The estimated projected distance from the core is roughly a few kpc, although the real distance may be larger due to projection effects [137]. This observational result provides further evidence for the acceleration of ultra-relativistic electrons in radio jets and confirms their major role in the TeV emission and misaligned AGN.…”

Section: Soft γ-Ray To Tev Radiation In Integral Agnsupporting

confidence: 56%

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

Malizia¹,

Fiocchi²,

Natalucci³

et al. 2021

Preprint

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Nuclear and electromagnetic cascades induced by ultra-high-energy cosmic rays in radio galaxies: implications for Centaurus A

Zhang

Murase

2023

Monthly Notices of the Royal Astronomical Society

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Very-high-energy (VHE) γ-rays ($\gtrsim 0.1\rm ~TeV$) and neutrinos are crucial for identifying accelerators of ultrahigh-energy cosmic rays (UHECRs), but this is challenging especially for UHECR nuclei. In this work, we develop a numerical code to solve the transport equation for UHECRs and their secondaries, where both nuclear and electromagnetic cascades are taken into account self-consistently, considering steady UHECR accelerators such as radio galaxies. In particular, we focus on Centaurus A, which has been proposed as one of the most promising UHECR sources in the local universe. Motivated by observations of extended VHE γ-ray emission from its kiloparsec-scale jet by the H.E.S.S. telescope, we study interactions between UHECRs accelerated in the large-scale jet and various target photon fields including blazar-like beamed core emission, and present a quantitative study on VHE γ-ray signatures of UHECR nuclei, including the photodisintegration and Bethe-Heitler pair-production processes. We show that VHE γ-rays from UHECR nuclei could be detected by the ground-based γ-ray telescopes given that the dominant composition of UHECRs consists of intermediate-mass (such as oxygen) nuclei.

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

Cited by 3 publications

References 46 publications

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

Nuclear and electromagnetic cascades induced by ultra-high-energy cosmic rays in radio galaxies: implications for Centaurus A

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