Journal Article

Discovery of a Fanaroff–Riley type 0 radio galaxy emitting at γ-ray energies

Paola Grandi, Alessandro Capetti and Ranieri D. Baldi

in Monthly Notices of the Royal Astronomical Society

Volume 457, issue 1, pages 2-8
ISSN: 0035-8711
Published online January 2016 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1093/mnras/stv2846
Discovery of a Fanaroff–Riley type 0 radio galaxy emitting at γ-ray energies

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We present supporting evidence for the first association of a Fermi source, 3FGLJ1330.0−3818, Acero et al. (2015) with the Fanaroff–Riley type 0 (FR 0) radio galaxy Tol1326−379. FR 0s represent the majority of the local population of radio-loud active galactic nuclei but their nature is still unclear. They share the same nuclear and host properties as FR Is, but they show a large deficit of extended radio emission. Here we show that FR 0s can emit photons at very high energies. Tol1326−379 has a GeV luminosity of L>1 GeV ∼ 2 × 1042 erg s−1, typical of FR Is, but with a steeper γ-ray spectrum (Γ = 2.78 ± 0.14). This could be related to the intrinsic jet properties but also to a different viewing angle.

Keywords: galaxies: active; galaxies: individual: Tol1326–379; galaxies: jets; gamma-rays: galaxies; radio continuum: galaxies

Journal Article.  5152 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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