XIIIth School of Cosmology
November 12 - 18, 2017IESC, Cargèse
The CMB from A to Z
promises and challenges of the CMB as a cosmological probe

The magnetized Galactic interstellar medium (ISM)

François Boulanger
Ecole Normale Supérieure, Paris


  1. Broad context: cosmic magnetism
  2. Observations of interstellar magnetic fields
  3. The interplay between interstellar matter and magnetic fields as seen by Planck


Turbulence, magnetic fields, thermal instability and gravity all play a role in the formation of stars through processes that we are far from understanding. The full understanding of this complex interplay of non-linear physics is beyond theoretical grasp, and we have to turn to observations and numerical simulations  for guidance. I will introduce this research field within the broader context of cosmic magnetism.  Next, I will focus presenting observations that characterize the structure of the magnetized ISM.  Last, I will show how the statistical properties of the Planck dust polarization maps relate and contribute to our understanding.


  • Articles
    • Planck intermediate results. XIX. An overview of the polarized thermal emission from Galactic dust
      Planck Collaboration, et al.
      2015, A&A, 576, A104
    • Planck intermediate results. XX. Comparison of polarized thermal emission from Galactic dust with simulations of MHD turbulence
      Planck Collaboration, et al.
      2015, A&A, 576, A105
    • The structure of the thermally bistable and turbulent atomic gas in the local interstellar medium
      Saury, E.; Miville-Deschênes, M.-A.; Hennebelle, P.; Audit, E.; Schmidt, W.
      2014, A&A, 567, A16
    • Planck intermediate results. XXXII. The relative orientation between the magnetic field and structures traced by interstellar dust
      Planck Collaboration, et al.
      2016, A&A, 586, A135
    • Planck intermediate results. XXXV. Probing the role of the magnetic field in the formation of structure in molecular clouds
      Planck Collaboration, et al.
      2016, A&A, 586, A138