Details on the event

01/09/2018

Warning: following the coronavirus emergency, all the talks will be given remotely online. The link to connect to the seminar will be available in due time. A playlist of the remote talks already online is available on our YouTube channel »

Joint Astrophysical Colloquium

Faint radio galaxies at the highest redshifts

Aayush Saxena (INAF-OAR)

Thursday 07/11/2019 @ 11:30, Sala IV piano Battiferro

Radio galaxies are fascinating objects and being one of the rarest and most massive types of galaxies in the early Universe, they can provide insights into the build-up of supermassive black holes and how it affects the growth of their host galaxy. High-redshift radio galaxies are often seen to be actively building up their stellar mass through intense star formation, lie in overdense parts of the Universe and contain large amounts of dust and gas. In this talk, I will first present a brief overview of modelling the origin and evolution of radio emission from AGN at high redshifts. I will then introduce our campaign leading to a new sample of faint radio sources selected at low radio frequencies and present follow-up spectroscopy and imaging for this sample. I will then talk about the discovery of the highest redshift radio galaxy known till date, at a redshift of 5.72, which was discovered in our sample. Lastly, I will describe the properties of other faint radio galaxies from our sample and how they are different from the luminous radio galaxies already known in the literature.