Multifrequency study of a double-double radio galaxy J1706+4340
| Autor: | Marek Jamrozy, Jerzy Machalski, Andrzej Marecki |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Radio galaxy
Astrophysics::High Energy Astrophysical Phenomena jets [galaxies] FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Instability X-shaped radio galaxy 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics individual: J1706+4340 [galaxies] Astrophysics::Galaxy Astrophysics Spin-½ Physics Very large array Supermassive black hole Jet (fluid) Giant Metrewave Radio Telescope 010308 nuclear & particles physics Astronomy Astronomy and Astrophysics non-thermal [radiation mechanisms] Astrophysics - Astrophysics of Galaxies galaxies [radio continuum] Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics |
| Popis: | We report the outcome of multifrequency radio observations of a double-double radio source J1706+4340 carried out with the Very Large Array and Giant Metrewave Radio Telescope. After supplementing our own data with those available in the literature, we collected a considerable set of radio measurements covering the range from 74 to 8460 MHz. This has enabled us to perform a comprehensive review of physical properties of the source and its dynamical evolution analysis. In particular, we found that, while the age of the large-scale outer lobes is in the range 260-300 Myr, the renewal of the jet activity, which is directly responsible for the double-double structure, took place only about 12 Myr ago after about 27-Myr long period of quiescence. Another important property of J1706+4340 we found is that the injection spectral indices and the jet powers for the inner and the outer doubles are very similar. This implies that it is the spin of the supermassive black hole rather than e.g. an instability of the accretion disc that is likely responsible for the jet production and its properties. 11 pages, 4 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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