Special Issue "Multi-Phase Fueling and Feedback Processes in Jetted AGN"

Dear Colleagues,

Relativistic radio-emitting jets associated with active galactic nuclei (AGNs) likely play a crucial role in the evolution of galaxies. By transferring a fraction of their kinetic energy to the surrounding medium (the so-called “kinetic-mode” AGN feedback), radio jets can both quench (negative feedback) and promote (positive feedback) star formation, thus regulating the growth of both central supermassive black holes (SMBHs) and their host galaxies. One of the most spectacular phenomena associated with relativistic jets is the creation of cavities and shocks in the hot X-ray-emitting atmospheres of galaxies, groups, and clusters, providing the most striking evidence that expanding radio jets can heat their surroundings, balancing their spontaneous radiative cooling losses.

Complementing earlier high-resolution radio, optical, and X-ray instruments (e.g., VLA, HST, Chandra, XMM-Newton), the unprecedented resolution and sensitivity provided by the latest generation of telescopes (e.g., VLT/MUSE, ALMA and the SKA precursors) combined with state-of-the-art simulations have opened up new regimes that have begun to revolutionize our view of the interplay between radio jets and their surrounding media. For instance, evidence has accumulated over the past few years indicating that jet-mode feedback can significantly alter the distribution, kinematics, and physics of the surrounding gaseous medium, including on (sub-)kpc scales, with a few examples starting to appear at high redshift as well. Recent observations also suggest that jetted AGNs may be self-regulated by a feeding and feedback loop, in which the matter that fuels the SMBH and triggers the jet activity gets regularly heated by these latter and stops being accreted, setting up a cycle that is fast compared to the evolutionary timescales of the host galaxies. All this provides clear evidence of a deep connection between the large-scale environment, fueling/feedback processes of jetted AGNs, and their host galaxy evolution, although the complexity of these phenomena still leave many open questions.

In this volume we will summarize the current state of knowledge on this topic, focusing on recent results from both multi-wavelength observations and complementary simulations, and looking towards future perspectives in the context of forthcoming facilities.

Dr. Isabella Prandoni
Dr. Ilaria Ruffa
Guest Editors

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• AGN feedback
• radio jets
• SMBH fueling
• galaxy evolution