Optical, Radio Continuum and HI Deep Spectroscopic Survey (ORCHIDSS)

Kenneth Duncan*, Andrew Baker, Philip Best, Sarah Blyth, Nina Hatch, Benne Holwerda, Matt Jarvis, Natasha Maddox, Daniel J. B. Smith, Marina Arnaudova, Laurent Chemin, Romeel Davé, James Dunlop, Bradley Frank, Eric Gawiser, Anniek Gloudemans, Catherine Hale, Ian Heywood, Sheila Kannappan, Rohit KondapallyRoss McLure, Leah Morabito, Nicole Nesvadba, Hengxing Pan, Anastasia Ponomareva, Matt Prescott, Hayley Roberts, Huub Rottgering, Rachel Somerville, Madalina Tudorache, Imogen Whittam, John Wu, Martin Zwaan

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract / Description of output

Galaxy evolution is regulated by the continuous cycle of gas accretion, consumption and feedback. Crucial in this cycle is the availability of neutral atomic (HI) and molecular hydrogen. Our current inventory of HI, however, is very limited beyond the local Universe (z > 0.25), resulting in an incomplete picture. ORCHIDSS is designed to address this critical challenge, using the powerful combination of 4MOST spectroscopy and sensitive radio observations from the MeerKAT deep extragalactic surveys to trace the evolution of neutral gas and its lifecycle within galaxies across the bulk of cosmic history.
Original languageEnglish
Pages (from-to)25-27
Number of pages2
JournalThe Messenger
Issue number2023
Publication statusPublished - 16 May 2023


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