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A subgrid model for the turbulent circumgalactic medium: Understanding the [CII] line emission

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  • Figure 1: The interpolated luminosity for the metallicity density space. For the interpolation a grid of 32 × 32 with density and metallicity values between 4e−27 g cm−3 and 2e−21 g cm−3 and 1e−6 Z to 1e1 Z are chosen. The color bar indicates the determined luminosity for a given metallicity and density. The performed simulations of the metallicity density tuples are overplotted in form of red dots.
  • Figure 2: [CII] emission maps viewed from face-on (top) and edge-on (bottom). The left column has a field of view of 120 kpc and shows the complete halo. In the middle row we zoom in and show the region with r < 60 kpc. In the right column only the innermost region of the halo is considered, r < 15 kpc. The color indicates the luminosity of the [CII] emission.

Theoretical Astrophysics group Cologne - TAC

Our research deals with the numerical modelling of the star formation process by means of high-performance, 3D, magneto-hydrodynamical (MHD) simulations. The simulations cover large spatial scales from ISM physics on kpc scales over molecular clouds on scales of 10 - 100 pc to star forming filaments on (sub-) pc scales and finally to protostellar discs and jets on scales of 10 - 1000 AU.

In our research group we use several tools like the (M)HD codes FLASH, GADGET, GANDALF , the astrochemical code KROME, 3D-PDR or radiative transport codes like RADMC-3D and POLARIS.

Prof. Dr. Stefanie Walch-Gassner is the head of the SILCC project (SImulating the life Cyle of molecular Clouds), a collaboration of several European astrophysical institutes, which has set the aim to model the formation, evolution, and dispersal of molecular clouds in 3D, MHD simulations with particular focus on a detailed astro-chemical modelling and the inclusion of various feedback processes.

Contact information:

  • Phone: (+49|0) 221 / 470 - 3497
  • Fax: (+49|0) 221 / 470 - 5162
  • Email: walch [at]

Consultation hours

upon agreement in Room 1.14, Building 312