Photo-disintegration of heavy nuclei at the core of Cen A

Kundu, Esha; Gupta, Nayantara

doi:10.1088/1475-7516/2014/04/030

Cited by 3 publications

(1 citation statement)

References 53 publications

(141 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to model the HESS data it was assumed that protons, Fe nuclei are accelerated in the inner jet of Cen A and their interaction with synchrotron photons can produce VHE emission (Sahu et al 2012;Joshi & Gupta 2013). More recent models explain the GeV hardness and VHE spectrum by considering the photo-disintegration of Fe-nuclei in the jet of Cen A (Kundu & Gupta 2014). Similarly a revised one zone SSC model combined with photo-hadronic interaction in the jet can explain the broad spectral energy distribution (SED) of Cen A (Petropoulou et al 2014;Fraija 2014).…”

Section: Introductionmentioning

confidence: 99%

Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A

Joshi,

Miranda,

Razzaque

et al. 2018

Preprint

View full text Add to dashboard Cite

The association of at least a dozen ultrahigh-energy cosmic-ray (UHECR) events with energy 55 EeV detected by the Pierre Auger Observatory (PAO) from the direction of Centaurus-A, the nearest radio galaxy, supports the scenario of UHECR acceleration in the jets of radio galaxies. In this work, we model radio to very high energy (VHE, 100 GeV) γ-ray emission from Cen A, including GeV hardness detected by Fermi-LAT and TeV emission detected by HESS. We consider two scenarios: (i) Two zone synchrotron self-Compton (SSC) and external-Compton (EC) models, (ii) Two zone SSC, EC and photo-hadronic emission from cosmic ray interactions. The GeV hardness observed by Fermi-LAT can be explained using these two scenarios, where zone 2 EC emission is very important. Hadronic emission in scenario (ii) can explain VHE data with the same spectral slope as obtained through fitting UHECRs from Cen A. The peak luminosity in cosmic ray proton at 1 TeV, to explain the VHE γ-ray data is ≈ 2.5 × 10 46 erg/s. The bolometric luminosity in cosmic ray protons is consistent with the luminosity required to explain the origin of 13 UHECR signal events that are correlated with Cen A.

show abstract

Section: Introductionmentioning

confidence: 99%

Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A

Joshi,

Miranda,

Razzaque

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

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

View full text Add to dashboard Cite

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.

show abstract

Very high-energy gamma-ray signature of ultrahigh-energy cosmic ray acceleration in Centaurus A

Joshi

Miranda

Razzaque

et al. 2018

Monthly Notices of the Royal Astronomical Society: Letters

View full text Add to dashboard Cite

The association of at least a dozen ultrahigh-energy cosmic ray (UHECR) events with energy ≳ 55 EeV detected by the Pierre Auger Observatory from the direction of Centaurus-A, the nearest radio galaxy, supports the scenario of UHECR acceleration in the jets of radio galaxies. In this work, we model radio to very high energy (VHE,≳ 100 GeV) γ-ray emission from Cen A, including GeV hardness detected by Fermi–LAT and TeV emission detected by the High Energy Stereoscopic System (HESS). We consider two scenarios: (i) two-zone synchrotron self-Compton (SSC) and external-Compton (EC) models, (ii) two-zone SSC, EC, and photohadronic emission from cosmic ray interactions. The GeV hardness observed by Fermi–LAT can be explained using these two scenarios, where zone 2 EC emission is very important. Hadronic emission in scenario (ii) can explain VHE data with the same spectral slope as obtained through fitting UHECRs from Cen A. The peak luminosity in cosmic ray proton at 1 TeV, to explain the VHE γ-ray data is ≈2.5 × 1046 erg s−1. The bolometric luminosity in cosmic ray protons is consistent with the luminosity required to explain the origin of 13 UHECR signal events that are correlated with Cen A.

show abstract

Photo-disintegration of heavy nuclei at the core of Cen A

Cited by 3 publications

References 53 publications

Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A

Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A

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

Very high-energy gamma-ray signature of ultrahigh-energy cosmic ray acceleration in Centaurus A

Contact Info

Product

Resources

About