ABSTRACT: Understanding the evolution of structure formation in the young Universe remains one of the outstanding challenges for modern astronomy. By observing the Universe at longer FIR-to-cm wavelengths we can obtain a unique perspective on the growth of massive galaxies at high-redshift. Powerful radio galaxies have long been known to act as the sign posts for over-dense regions when the Universe was less than half of its present age. This has led to the assumption that these may signify early proto-clusters of galaxies. Similarly, submm-wavelength continuum observations trace the formation of obscured galaxy formation out to the early Universe, and so targeted submm-wavelength surveys of radio galaxy fields can assess the degree to which dusty starburst galaxies may be associated with proto-cluster regions. To this end, we have conducted The RAdio Galaxy Environment Reference Survey (RAGERS) using the East Asian Observatory on Mauna Kea. I will present maps and preliminary results on the submm sources, their number counts and the associated Very Large Array radio observations of the fields of more than 20 high-redshift radio galaxies. We address the question of whether the FIR and radio-selected galaxies may be more abundant around power radio galaxies relative to what is observed in the field.

BIO:
Jeff Wagg is an astronomer and data scientist with over fifteen years of experience working for radio telescope observatories. He is a PIFI Visiting Scientist hosted by PMO. Until recently, he was a project scientist for the Square Kilometre Array Observatory (SKAO) based in the UK. Prior to that he was a research Fellow at the European Southern Observatory (ESO) in Chile, and the National Radio Astronomy Observatory (NRAO) in New Mexico.

He studies the formation and evolution of galaxies at high-redshift, focussing on the understanding of their cool molecular gas and dust content. He is a Co-I on the RAGERS large programme using the East Asian Observatory, which is studying the large-scale distribution of submm galaxies associated with power distant radio galaxies.