Although radio AGN play a key role in galaxy evolution through their feedback effect, we still do not fully understand how they are triggered and fuelled. Possibilities range from major, gas-rich mergers on the one hand, to direct accretion of the hot gas from the X-ray haloes of the host galaxies and clusters on the other. The cool ISM reservoirs of the host galaxies provide key information...
We report the first results of the MURALES survey, a program of MUSE observations of 40 nearby (z<0.3) 3C radio galaxies. The MUSE data, combined with the unique multiband dataset available for these sources adds a key ingredient for our understanding of the radio-loud AGN feedback. We already fully modelled the MUSE data obtained for all the sources. The line emission images ...
This presentation resume our results using optical integral field spectroscopy of four nearby (z < 0.07) radio galaxies obtained with GMOS in Gemini North and South telescopes (Couto et al. 2013, 2016, 2017,in prep), a series of studies of the gas excitation and kinematics of the sample. The field-of-view probes a circumnuclear region of ~3.5”x5”, with average spatial resolution of ~0.6”. The...
The basic principles of the dynamical evolution of powerful radio sources have been known for over 40 years but the details, and particularly the details of their interaction with their environments, continue to be an interesting topic. I'll discuss the current state of the art of radio source dynamics based on the latest observations and on numerical and analytical models.
Supermassive black holes at the centre of galaxies can cycle through periods of activity (in this phase known as active galactic nuclei, AGN) and quiescence. Quantifying the duty cycle of AGN is crucial for understanding the energetic impact they have on the host galaxy. In radio AGN this duty cycle can be investigated by using the characteristics of the radio spectrum and the morphology of...
Powerful radio galaxies are known to play a key role in determining the evolutionary path of galactic populations; however, much of the physics that underlie these important sources remains poorly understood. One of the most pressing questions in radio galaxy physics today is determining the age, life expectancy, and duty cycle of these sources and how this evolves over cosmic time. A detailed...
Double-double Radio Galaxies (DDRGs) consist of a pair of double radio sources with a common central AGN. They are unique observational evidence of recurrent jet activity in AGN. In most cases, the diffuse outer double lobes appear reasonably well aligned with the inner ones and they maintain long-term steadiness in bipolar relativistic jet outflows. There are a few examples of “misaligned...
We introduce a new class of "hybrid" radio structures associated with tailed
sources in clusters of galaxies. These hybrid structures do not appear consistent
with models or simulations of material that originated in the outflowing jets.
At the same time, they are not random features of the ICM, e.g., from old radio
galaxies, because they are structurally connected to tailed sources. ...
Radio loud Active Galactic Nuclei are episodic in nature, cycling through periods of activity and quiescence. The study of this duty cycle is essential for quantifying the feedback of radio jets on the host galaxy, which is a key parameter in galaxy evolution models. Evidence of this recurrence is observed in restarted radio galaxies, where large-scale old plasma is seen together with a pair...
The masses of central supermassive black holes are known to correlate with the bulge components of their host galaxies, suggesting a coevolution of the two. Here, we report the discovery of a tight correlation between the temperatures of the hot atmospheres permeating brightest cluster/group galaxies (BCGs) and the masses of their central supermassive black holes, making the atmospheric gas...
