Radio-quiet active galactic nuclei as possible sources of ultrahigh-energy cosmic rays

Asaf Pe'er, Kohta Murase, Peter Mészáros

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Active galactic nuclei (AGNs) have been one of the most widely discussed sources of ultrahigh-energy cosmic rays (UHECRs). The recent results of the Pierre Auger observatory have indicated a possible composition change of UHECRs above ∼1018.5eV toward heavy nuclei. We show here that if indeed UHECRs are largely heavy nuclei, then nearby radio-quiet AGNs can also be viable sources of UHECRs. We derive constraints on the acceleration sites which enable acceleration of UHECRs to 1020eV without suffering losses. We show that the acceleration of UHECRs and the survival of energetic heavy nuclei are possible in the parsec-scale weak jets that are typically observed in these objects, the main energy loss channel being photodisintegration. On this scale, energy dissipation by shock waves resulting from interactions inside a jet or of the jet with surrounding material are expected, which may accelerate the particles up to very high energies. We discuss the possible contribution of radio-quiet AGNs to the observed UHECR flux, and show that the required energy production rate in UHECRs by a single object could be as low as 3×1039ergs-1, which is less than a percent of the bolometric luminosity, and thus energetically consistent. We discuss consequences of this model, the main one being the difficulty in detecting energetic secondaries (γ-rays and neutrinos) from the same sources.

Original languageEnglish (US)
Article number123018
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume80
Issue number12
DOIs
StatePublished - Dec 30 2009

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Fingerprint

Dive into the research topics of 'Radio-quiet active galactic nuclei as possible sources of ultrahigh-energy cosmic rays'. Together they form a unique fingerprint.

Cite this