Evolution of non-thermal shell emission associated with active galactic nucleus jets

Hirotaka Ito, Motoki Kino, Nozomu Kawakatu, Shoichi Yamada

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    We explore the evolution of emissions by accelerated electrons in shocked shells driven by jets in active galactic nuclei. Focusing on powerful sources which host luminous quasars, we evaluated the broadband emission spectra by properly taking into account adiabatic and radiative cooling effects on the electron distribution. The synchrotron radiation and inverse Compton (IC) scattering of various photons that are mainly produced in the accretion disk and dusty torus are considered as radiation processes. We show that the resultant radiation is dominated by the IC emission for compact sources (≲10 kpc), whereas the synchrotron radiation is more important for larger sources. We also compare shell emissions with those expected from the lobe under the assumption that the fractions of the energy deposited in the shell and lobe carried by non-thermal electrons are εe 0.01 and εe,lobe 1, respectively. We find that shell emissions are brighter than lobe ones at infrared and optical bands when the source size is ≳10 kpc, and the IC emissions from the shell at ≳10 GeV can be observed with an absence of contamination from the lobe irrespective of the source size. In particular, it is predicted that, for most powerful nearby sources (L j 10 47 erg s-1), TeV gamma-rays produced via IC emissions can be detected by modern Cherenkov telescopes such as MAGIC, HESS, and VERITAS.

    Original languageEnglish
    Article number120
    JournalAstrophysical Journal
    Volume730
    Issue number2
    DOIs
    Publication statusPublished - 2011 Apr 1

    Fingerprint

    active galactic nuclei
    lobes
    shell
    synchrotron radiation
    electron
    radiation
    electron distribution
    accretion disks
    quasars
    contamination
    emission spectra
    erg
    electrons
    gamma rays
    telescopes
    broadband
    cooling
    accretion
    scattering
    photons

    Keywords

    • acceleration of particles
    • galaxies: active
    • galaxies: jets
    • radiation mechanisms: non-thermal
    • shock waves

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Evolution of non-thermal shell emission associated with active galactic nucleus jets. / Ito, Hirotaka; Kino, Motoki; Kawakatu, Nozomu; Yamada, Shoichi.

    In: Astrophysical Journal, Vol. 730, No. 2, 120, 01.04.2011.

    Research output: Contribution to journalArticle

    Ito, Hirotaka ; Kino, Motoki ; Kawakatu, Nozomu ; Yamada, Shoichi. / Evolution of non-thermal shell emission associated with active galactic nucleus jets. In: Astrophysical Journal. 2011 ; Vol. 730, No. 2.
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