Fossil shell emission in dying radio loud AGNs

Abstract

We investigate shell emission associated with dying radio loud AGNs. First, based on our recent work by Ito et al. (2015), we describe the dynamical and spectral evolutions of shells after stopping the jet energy injection. We find that the shell emission overwhelms that of the radio lobes soon after stopping the jet energy injection because fresh electrons are continuously supplied into the shell via the forward shock while the radio lobes rapidly fade out without jet energy injection. We find that such fossil shells can be a new class of target sources for SKA telescope. Next, we apply the model to the nearby radio source 3C84. Then, we find that the fossil shell emission in 3C84 is less luminous in radio band while it is bright in TeV gamma-ray band and it can be detectable by CTA.

5 pages, 5 figures, 1 table, in press for Astronomische Nachrichten. Contribution to the Proceedings of the "Fifth Workshop on Compact Steep Spectrum and GHz-Peaked Spectrum Radio Sources", held in Rimini (Italy) in May 2015

References in corpus (6)

• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
• High-energy particle acceleration at the radio-lobe shock of Centaurus A
• Probing the Evolution of IR Properties of z~6 Quasars: Spitzer Observations
• Magnetic Fields in the Center of the Perseus Cluster
• New class of Very High Energy gamma-ray emitter: radio-dark mini-shells surrounding AGN jets
• Evolution of non-thermal emission from shell associated with AGN jets

Cited by in corpus (4)

• Hitomi Observation of Radio Galaxy NGC 1275: The First X-ray Microcalorimeter Spectroscopy of Fe-Kα Line Emission from an Active Galactic Nucleus
• Evidence of jet-clump interaction: a flip of the radio jet head of 3C~84
• The Dynamics and Energetics of Remnant and Restarting RLAGN
• Fossil shell in 3C 84 as TeV $\gamma$-ray emitter and cosmic-ray accelerator