April 2026
Estimating ionization fractions in SILCC simulations (Lennart Buhlmann)
SUPPRESSION OF CO CLUMP FORMATION BY MAGNETIC FIELDS
The understanding the structural and chemical evolution of molecular clouds could provide us with a better insight to the conditions leading to star formation.
We address this task by hydrodynamical simulations realised by 3D AMR code FLASH. We study cloud formation in two colliding magnetised flows of various strenght of the magnetic field, which varies from 0 to 5μG.
At the beginning, the magnetic field lines are parallel with the flow velocity. The simulations include the chemistry model of Nelson & Langer (1997), which is used to track the chemical evolution of some abundant gas species including CO molecule.
We detect the forming molecular clumps in CO by the Fellwalker algorithm (Berry 2014). This analysis is done on snapshots taken at different time throughout the simulations. Then, the clump mass function can be calculated; the time-averaged clump mass function for models with different magnetic field strength B is shown in the figure. We do not see that the presence of the magnetic fields, or their strength suppresses or promotes formation of higher mass clumps in respect to lower mass clumps. Thus, these tentative results indicate that the clump mass function is largely unaffected by the value of B (at least up to 5μG).
Monthly Highlights
March 2026
1D protostellar disk sub-grid model for star formation 3D MHD simulations (Anaïs Pauchet)
January 2026
Protostellar Outflows: From Simulations to Synthetic Observations (Taishi Ushirogi)
December 2025
Prestellar Core Formation in Colliding Gas Flows: Simulations and Synthetic Observations (Felix Rauprich)
November 2025
Measuring the Velocity Dispersion of the Warm Neutral Medium of the Milky Way at Galactic Scale using the Code FLASH (Wajdee Chayeb)
October 2025
Higher-order finite volume method for modelling shock waves in the interstellar medium (Mervin Yap)
June 2025
Simulating [CII] emission in high-redshift galaxies and their halos (Clarissa Immisch)
May 2025
Episodic Accretion onto Low Mass Protostars (Christian Riesop)
April 2025
Molecular cloud formation: Impact of metallicity, far-UV and CR heating using SILCC-Zoom simulations (Sanjit Pal)
March 2025
Modelling Protostellar Outflows in ISM Simulations (Michael Weis)
February 2025
Multi-band ray-tracing of ionizing photons (Sebastian Vider)
December 2024
Simulating the ISM and its processes (Sebastian Vider)