A 3D View on Galaxy Evolution

To decipher the underlying processes that shape galaxies over time, we need to uncover their physical properties and the conditions controlling them. This in turn requires in-depth measurements of the stars, gas and dust, inside as well as surrounding the galaxies.

The advent of new powerful spectral imagers in the optical and radio to (sub-)millimeter domain is providing now the opportunity to obtain detailed 3D information about the physical properties of these components in nearby galaxies. In the optical, several larger integral-field unit surveys like CALIFA, SAMI, and MaNGA are underway to gather detailed information on the distribution, kinematics and chemical properties of the stars and ionized gas in galaxies of different morphological types and in different environments. The (sub-)millimeter interferometers ALMA and NOEMA can provide similar detailed information for the molecular gas (and dust), though for a smaller number of galaxies. The coming years thus provide a unique opportunity to link research with spectral imagers across wavelengths and gain unprecedented insights in the physics determining a galaxy’s fate.

We propose a workshop to search for synergy approaches between the optical and radio community to progress our physical understanding of the evolution of galaxies across the Hubble sequence. With these constraints from nearby galaxies providing a benchmark for high(er) redshift galaxy observations as well as for galaxy formation models in a cosmological context, we are also aiming for targeted contributions by scientists from both these communities. The format will be that of a classical workshop with a review talk followed by invited and contributed talks as well as ample time for discussions. One particular aim of the workshop is to identify potential areas where dedicated efforts from both the optical and radio community can lead to major scientific break-throughs.

Questions to be addressed include :

  1. Dynamical structure and formation history – How are luminous and dark matter distributed in galaxies? Does the (internal) structure of galaxies reflect fossil records of their formation?
  2. Interstellar Medium – Where does the gas in galaxies come from? What controls the gas heating and cooling?
  3. Star formation – Why do stars form where they form in a galaxy? On which time-scales are stars being formed?
  4. Energetic phenomena – Are energetic phenomena (AGN, starburst) the cause for quenching? What is the physical impact on a galaxy’s fate of these phenomena?