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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26045
Title: The Fate of Dead Radio-loud Active Galactic Nuclei: A New Prediction of Long-lived Shell Emission
Authors: Ito, Hirotaka
Kino, Motoki
Kawakatu, Nozomu
ORIENTI, Monica 
Issue Date: 2015
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 806
Issue: 2
First Page: 241
Abstract: We examine the fate of a dead radio source in which jet injection from the central engine has stopped at an early stage of its evolution (t={t}<SUB>j</SUB>≲ {10}<SUP>5</SUP> {years}). To this aim, we theoretically evaluate the evolution of the emission from both the lobe and the shell, which are composed of shocked jet matter and a shocked ambient medium (i.e., shell), respectively. Based on a simple dynamical model of expanding lobe and shell, we clarify how the broadband spectrum of each component evolves before and after the cessation of the jet activity. It is shown that the spectrum is strongly dominated by the lobe emission while the jet is active (t≤slant {t}<SUB>j</SUB>). On the other hand, once the jet activity has ceased (t\gt {t}<SUB>j</SUB>), the lobe emission fades out rapidly, since fresh electrons are no longer supplied from the jet. Meanwhile, shell emission only shows a gradual decrease, since fresh electrons are continuously supplied from the bow shock that is propagating into the ambient medium. As a result, overall emission from the shell overwhelms that from the lobe at a wide range of frequencies from radio up to gamma-ray soon after the jet activity has ceased. Our result predicts a new class of dead radio sources that are dominated by shell emission. We suggest that the emission from the shell can be probed in particular at radio wavelengths with the Square Kilometer Array phase 1.
URI: http://hdl.handle.net/20.500.12386/26045
URL: https://iopscience.iop.org/article/10.1088/0004-637X/806/2/241
ISSN: 0004-637X
DOI: 10.1088/0004-637X/806/2/241
Bibcode ADS: 2015ApJ...806..241I
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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