Speaker
Description
In the radio regime, blazars are mostly compact sources. However, at low radio frequencies, we may observe large-scale (several hundred of kpcs) structures. In such a case, two different radio components make up the total radio flux: a flat-spectrum central element and steep-spectrum diffuse pair of lobes, sometimes irregular, plural or misaligned with the jet axis. We interpret their morphologies in the framework of a reorientation of the jet axis related to i.a. episodic jet activity or precession. Here, we present a continuation of the pilot study presented in Pajdosz-Śmierciak et al. 2022: a sample of „extended” blazars viewed by the Lofar Two-meter Sky Survey-V. 2nd Data Release (Shimwell et al. 2022), along with their statistical and physical properties such as total radio power, spectral index or jet realingment timescale. Based on the derived data, jets could change the direction of propagation out of the sky plane during the lifetime of at least some of these sources and with such we may observe morphologically different AGN types simultaneously – similar to the previously discovered giant radio blazar SBS B1646+499 (Pajdosz-Śmierciak et al. 2018). Several plausible origin scenarios are discussed, including i. a. fast jet realignment via Lense-Thirring drag mechanism. From the other hand, we also discussed the possibility that these objects are actually Giant Radio Blazars with rare Fanaroff–Riley I morphology. Hence, the obtained results were compared to the analysis of giant radio galaxies by Dabhade et al. 2020a, 2020b. We find the above interesting not only in the frame of the AGN unification but also, for example, feedback processes and central engines analysis.
