Conveners
Clusters/LSS & AGN/High-z
- Konstantinos Kolokythas (Rhodes University)
Radio galaxies moving through the intra-cluster medium with high velocities experience ram-pressure, which deflects their radio jets and re-shapes them into head-tail galaxies (HTs) typically spanning few hundreds of kpc. Electrons are initially ejected from the head (core), and then progressively age along the tail due to radiative losses. However, recent observations at low ($\sim$ 100 MHz)...
I will present new VLA observations that reveal the structure of a new population of low-luminosity FRII radio galaxies discovered in LoTSS. Fanaroff and Riley (1974) identified a luminosity break between their two morphological classes. FRIs are defined to be low-luminosity, centre bright jets and the higher luminosity FRIIs have jets that are edge brightened and terminate in hotspots. Using...
A variety of radio sources have so far questioned the idea that AGN-driven jets are always stable, straight, linear outflows. A significant challenge in understanding how jets can change their orientation over time is related to the vast range of spatial scales involved, spanning from a few pc to tens of kpc. To illustrate the importance of high-resolution and sensitive observations for...
The MeerKAT Absorption Line Survey (MALS) has observed 391 telescope pointings at L-band (900-1670 MHz) at declination<20 deg. In this talk, I’ll present the radio continuum images and a catalog of 495,325 (240,321) radio-sources detected at SNR> 5 over an area of 2289 deg^2 (1132 deg^2) at 1006 MHz (1381 MHz). With excellent continuum (20 microJy/beam) and spectral sensitivity (0.5 mJy/beam...
In this talk I will present what is now the largest statistically complete sample of $z>5$ radio-powerful AGN currently available. The sample was built starting from the RACS radio survey and its combination with the deepest wide-area optical/NIR survey. It is composed by 32 high-$z$ objects, 15 of which newly discovered by us through dedicated spectroscopic observations. I will also present...
Jetted Active Galactic Nuclei (AGN) recurrently inflate lobes of relativistic plasma and magnetic fields, which are thought to rise buoyantly as light bubbles into the intragroup/intracluster medium, counterbalancing its spontaneous cooling. Understanding how these bubbles evolve and eventually mix with the surrounding gas on long timescales is important to constrain the impact they have on...
