Title: Giant black hole jets and baryon feedback to the Cosmic Web

Place: Seminar del DAA. Jeroni Muñoz Research Building, fourth floor, in Burjassot.

Day: Tuesday, june 30 , 2026. Time: 12.00.

Abstract:

When the launching of powerful SMBH jets persists over millions of years, megaparsec-long flows of thermal, magnetic, and cosmic ray energy emerge. These giant feedback systems to the Cosmic Web are the largest galaxy-made structures in the Universe. Over the last years, thanks to sensitivity gains of large-scale radio surveys, such as LOFAR's, evidence has accrued that megajets — generally thought to be rare and cosmologically insignificant only years ago — are not only common, but possibly the dominant source of black hole feedback to the Cosmic Web. A renewed interest in megajets coincides with the realisation that leading cosmological simulations feature insufficient large-scale baryon feedback, affecting cosmologists' ability to infer cosmological parameters from the newest surveys, such as DESI's, Euclid's, and the LSST.
To help improve simulations and realise precision late-time cosmology with these flagship surveys, it is a priority to understand the origin and cosmological impact of megajets. This talk presents recent results on the host galaxies of megajets, their feedback potential, and — through stacking — the low–surface brightness relativistic electron populations indicative of feedback that new radio surveys are starting to pick up.