Escape of Lyman radiation from galactic labyrinths
18-21 April 2023, OAC, Kolymbari, Crete

Rationale
The genesis and escape of Lyman alpha and continuum radiation on galactic and subgalactic scales is a result of a complex and subtle interplay between the dynamical constituents of evolving galaxies. Our knowledge on how Lyman radiation produced by massive stars, AGN and shocks is further processed within a galaxy is woefully incomplete.

On subgalactic scales, the pathways of Lyman photons from young stellar clusters and HII regions into the surrounding diffuse ionized gas, and their imprints on the physical properties of the multi-phase ISM are still unclear. On galactic scales, the scattering Odyssey of Lyman-alpha photons from their birthplace out to the galactic halo remains to be written. How feedback processes shape the 3D structure, chemical abundance patterns and kinematics of the gas along this route, and what mechanisms regulate the escape of Lyman radiation out of the galaxy Labyrinth is an unsolved enigma. The escape fraction of Lyman radiation along the co-evolution of AGN with their galaxy hosts is another subject with key astrophysical relevance where our knowledge is still largely incomplete. A final question concerns how escaping Lyman radiation can illuminate the cosmic web and influence the evolution of galaxies across larger cosmic volumes.

The goal of this meeting is to bring observers and theoreticians together toward a joint exploration of the Odyssey of Lyman radiation on its way out of the galaxy Labyrinth.

This conference is motivated by questions such as:

• how are the formation history of galaxies and the evolving physical properties of their multi-phase ISM related to the escape fraction of Lyman-alpha and Lyman-continuum photons?
• how does the escape of Lyman radiation evolve with the rise and fall of star-forming and accretion-powered nuclear activity in galaxies, and what are its imprints on the circumgalactic medium and the cosmic web?
• what modeling concepts and observational constraints are most needed to achieve a breakthrough in our understanding of Lyman photon escape both at subgalactic and galactic scales?

Topics
i.   Production of Lyman radiation
ii.  Transport of Lyman radiation on subgalactic scales
iii. Lyman photon escape in star-forming galaxies
iv.  Observing facilities with special importance to the understanding of Lyman photon escape

Confirmed invited speakers (as of January 16, 2023)
Andrea Ferrara   (Scuola Normale Superiore, Italy)
Andrea Grazian   (INAF–Osservatorio Astronomico di Padova, Italy)
Andreas Sander   (ZAH, University of Heidelberg, Germany)
Anne Jaskot      (Department of Astronomy, Williams College, USA)
Anne Verhamme    (University of Geneva, Switzerland)
Fabrice Martins  (Université de Montpellier, France)
Jan Eldridge     (University of Auckland, New Zealand)
Jorryt Matthee   (ETH Zürich, Switzerland)
Joseph Lewis     (ZAH, University of Heidelberg, Germany)
Maxime Trebitsch (University of Groningen, Netherlands)
Peter Senchyna   (Carnegie Observatories, USA)
Ricardo Amorín   (University of La Serena, Chile)
Rogier Windhorst (Arizona State University, USA)