A multi-tracer view of galaxies in the first few billion years

Start Date
End Date

In the past decades the study of the high-redshift Universe has been dominated by observations of mostly unobscured sources found in optical and near-infrared surveys from telescopes such as Hubble and now JWST. 

Despite the clear power of near-infrared photometry and spectroscopy in finding and studying distant galaxies, the wavelength coverage of these data limits direct measurements of the interstellar gas and dust.  Deep sub-mm and radio surveys from e.g. ALMA and the VLA are now able to provide measurements of the obscured star-formation, ISM conditions and potential AGN contribution for the first time at z > 4. 

Furthermore, line intensity mapping experiments can provide global constraints on gas properties in galaxies, from HI as well as CO lines. Both global CO and HI constraints from experiments like COMAP, CHIME and SKA will provide complementary information on star formation and general galaxy evolution at high-z.

In this specialist discussion meeting we will summarise and discuss what we can learn by combining multi-wavelength/radio/sub-mm observations with current optical/NIR data from HST/JWST.  The primary topics for discussion are:

  • Properties of high-z galaxies from optical/NIR observations
  • Constraints on the ISM and dust in these galaxies 
  • The contribution of `HST’-dark/heavily dusty obscured/quiescent objects
  • The abundance and multi-wavelength signatures of AGN in high-z galaxies
  • HI and CO gas constraints from line intensity mapping

We aim to bring together experts on both optical/NIR and sub-mm/radio properties of galaxies in the first few billion years to share knowledge and discuss existing or new synergies. 

The meeting is timely given we will have had 1.5 years of JWST results and follow-up of these sources with ALMA and other facilities, in addition to the recent completion of deep radio surveys such as the MeerKAT and LOFAR deep fields



Rebecca Bowler

Renske Smit

Laura Wolz

Nathan Adams

Chris Conselice

Venue Address

The Geological Society,Burlington House,LONDON


51.5087877, -0.13876359999995