Challenges and techniques for simulating line emission

Karen P. Olsen, Andrea Pallottini, Aida Wofford, Marios Chatzikos, Mitchell Revalski, Francisco Guzmán, Gergö Popping, Enrique Vázquez-Semadeni, Georgios E. Magdis, Mark L.A. Richardson, Michaela Hirschmann, William J. Gray

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Modeling emission lines from the millimeter to the UV and producing synthetic spectra is crucial for a good understanding of observations, yet it is an art filled with hazards. This is the proceedings of "Walking the Line", a 3-day conference held in 2018 that brought together scientists working on different aspects of emission line simulations, in order to share knowledge and discuss the methodology. Emission lines across the spectrum from the millimeter to the UV were discussed, with most of the focus on the interstellar medium, but also some topics on the circumgalactic medium. The most important quality of a useful model is a good synergy with observations and experiments. Challenges in simulating line emission are identified, some of which are already being worked upon, and others that must be addressed in the future for models to agree with observations. Recent advances in several areas aiming at achieving that synergy are summarized here, from micro-physical to galactic and circum-galactic scale.

Original languageEnglish
Article number100
Issue number4
StatePublished - Sep 20 2018

Bibliographical note

Funding Information:
The authors thank the two anonymous referees for their thoughtful comments and suggestions. The authors thank all participants at the Walking the Line 2018 conference for presenting their work and stimulating discussions. The authors also thank Mark Krumholz, Livia Vallini, Christian Brinch, Robert Loughnane, Peter van Hoof, Moupiya Maji, William Gray, and Sthabile Kolwa for providing additional info and comments to this paper. The workshop of which the results are presented was in part sponsored by professor Rogier Windhorst and the School of Earth and Space Exploration at Arizona State University. M.R. gratefully acknowledges support from the National Science Foundation through the Graduate Research Fellowship Program (DGE-1550139). M.C. was supported by NASA through a grant (HST-AR-14556.001-A) from the Space Telescope Science Institute. F.G. acknowledges support by NSF (1412155). GEM acknowledges support from a research grant (13160) from Villum Fonden.

Publisher Copyright:
© 2018 by the authors.


  • AGN
  • CGM
  • Galaxies
  • Hydrodynamic simulations
  • ISM
  • Line emission
  • Radiative transfer
  • Simulation

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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