Multi-frequency study of a double-double radio galaxy J0028+0035
| Autor: | Andrzej Marecki, Marek Jamrozy, Jerzy Machalski, U. Pajdosz-Śmierciak |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Jet (fluid) 010308 nuclear & particles physics Radio galaxy Radio flux FOS: Physical sciences myr Astronomy and Astrophysics Astrophysics LOFAR Astrophysics::Cosmology and Extragalactic Astrophysics Compact star 01 natural sciences Astrophysics - Astrophysics of Galaxies Space and Planetary Science Coincident Astrophysics of Galaxies (astro-ph.GA) Long period 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Popis: | We report the discovery of a double-double radio source (DDRS) J0028+0035. We observed it with LOFAR, GMRT, and the VLA. By combining our observational data with those from the literature, we gathered an appreciable set of radio flux density measurements covering the range from 74 MHz to 14 GHz. This enabled us to carry out an extensive 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 about 245 Myr, the renewal of the jet activity, which is directly responsible for the double-double structure, took place only about 3.6 Myr ago after about 11 Myr long period of quiescence. Another important property typical for DDRSs and also present here is that the injection spectral indices for the inner and the outer pair of lobes are similar. The jet powers in J0028+0035 are similar too. Both these circumstances support our inference that it is, in fact, a DDRS which was not recognized as such so far because of the presence of a coincident compact object close to the inner double so that the centre of J0028+0035 is apparently a triple. 14 pages, 8 figures, matches the version published in MNRAS |
| Databáze: | OpenAIRE |
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