Publications (20)
Simulating Star Clusters Across Cosmic Time: II. Escape Fraction of Ionizing Photons from Molecular Clouds
Chong-Chong He, Massimo Ricotti, Sam Geen
We calculate the hydrogen and helium-ionizing radiation escaping star-forming molecular clouds, as a function of the star cluster mass and compactness, using a set of high-resoluti…
Influence of protostellar jets and HII regions on the formation and evolution of stellar clusters
Antoine Verliat, Patrick Hennebelle, Marta González +2
Context. Understanding the conditions in which stars and stellar clusters form is of great importance. In particular the role that stellar feedback may have is still hampered by la…
The Geometry and Dynamical Role of Stellar Wind Bubbles in Photoionised HII Regions
Sam Geen, Rebekka Bieri, Joakim Rosdahl +1
Winds from young massive stars contribute a large amount of energy to their host molecular clouds. This has consequences for the dynamics and observable structure of star-forming c…
The Energy and Dynamics of Trapped Radiative Feedback with Stellar Winds
Sam Geen, Rebekka Bieri, Alex de Koter +2
In this paper, we explore the significant, non-linear impact that stellar winds have on H ii regions. We perform a parameter study using three-dimensional radiative magnetohydrodyn…
Interpreting the Star Formation Efficiency of Molecular Clouds with Ionising Feedback
Sam Geen, Juan D Soler, Patrick Hennebelle
We investigate the origin of observed local star formation relations using radiative magnetohydrodynamic simulations with self-consistent star formation and ionising radiation. We…
Simulating Star Clusters Across Cosmic Time: I. Initial Mass Function, Star Formation Rates and Efficiencies
Chong-Chong He, Massimo Ricotti, Sam Geen
We present radiation-magneto-hydrodynamic simulations of star formation in self-gravitating, turbulent molecular clouds, modeling the formation of individual massive stars, includi…
On the Indeterministic Nature of Star Formation on the Cloud Scale
Sam Geen, Stuart K. Watson, Joakim Rosdahl +3
Molecular clouds are turbulent structures whose star formation efficiency (SFE) is strongly affected by internal stellar feedback processes. In this paper we determine how sensitiv…
The SATIN project I: Turbulent multi-phase ISM in Milky Way simulations with SNe feedback from stellar clusters
Rebekka Bieri, Thorsten Naab, Sam Geen +3
We introduce the star formation and Supernova (SN) feedback model of the SATIN (Simulating AGNs Through ISM with Non-Equilibrium Effects) project to simulate the evolution of the s…
Bottling the Champagne: Dynamics and Radiation Trapping of Wind-Driven Bubbles around Massive Stars
Sam Geen, Alex de Koter
In this paper we make predictions for the behaviour of wind bubbles around young massive stars using analytic theory. We do this in order to determine why there is a discrepancy be…
Bringing Stellar Evolution & Feedback Together: Summary of proposals from the Lorentz Center Workshop, 2022
Sam Geen, Poojan Agrawal, Paul A. Crowther +34
Stars strongly impact their environment, and shape structures on all scales throughout the universe, in a process known as ``feedback''. Due to the complexity of both stellar evolu…
When H II Regions are Complicated: Considering Perturbations from Winds, Radiation Pressure, and Other Effects
Sam Geen, Eric Pellegrini, Rebekka Bieri +1
We explore to what extent simple algebraic models can be used to describe H II regions when winds, radiation pressure, gravity and photon breakout are included. We a) develop algeb…
Impact of galactic shear and stellar feedback on star formation
Cédric Colling, Patrick Hennebelle, Sam Geen +2
A numerical shearing box is used to perform three-dimensional simulations of a 1 kpc stratified cubic box of turbulent and self-gravitating interstellar medium (in a rotating frame…
Trapping of HII regions in Population III star formation
Ondrej Jaura, Simon C. O. Glover, Katharina M. J. Wollenberg +3
Radiative feedback from massive Population III (Pop III) stars in the form of ionising and photodissociating photons is widely believed to play a central role in shutting off accre…
Satellite Survival in Highly Resolved Milky Way Class Halos
Sam Geen, Adrianne Slyz, Julien Devriendt
Surprisingly little is known about the origin and evolution of the Milky Way's satellite galaxy companions. UV photoionisation, supernova feedback and interactions with the larger…
The R136 star cluster dissected with Hubble Space Telescope/STIS. III. The most massive stars and their clumped winds
Sarah A. Brands, Alex de Koter, Joachim M. Bestenlehner +17
Context: The star cluster R136 inside the LMC hosts a rich population of massive stars, including the most massive stars known. The strong stellar winds of these very luminous star…
A Detailed Study of Feedback from a Massive Star
Sam Geen, Joakim Rosdahl, Jeremy Blaizot +2
We present numerical simulations of a 15 solar mass star in a suite of idealised environments in order to quantify the amount of energy transmitted to the interstellar medium (ISM)…
A systematic study of the escape of LyC and Ly photons from star-forming, magnetized turbulent clouds
Taysun Kimm, Rebekka Bieri, Sam Geen +4
Understanding the escape of Lyman continuum (LyC) and Lyman (Ly) photons from giant molecular clouds (GMCs) is crucial if we are to study the reionization of the Universe…
Feedback in Clouds II: UV Photoionisation and the first supernova in a massive cloud
Sam Geen, Patrick Hennebelle, Pascal Tremblin +1
Molecular cloud structure is regulated by stellar feedback in various forms. Two of the most important feedback processes are UV photoionisation and supernovae from massive stars.…
Photoionisation Feedback in a Self-Gravitating, Magnetised, Turbulent Cloud
Sam Geen, Patrick Hennebelle, Pascal Tremblin +1
We present a new set of analytic models for the expansion of HII regions powered by UV photoionisation from massive stars and compare them to a new suite of radiative magnetohydrod…
How Does Feedback Affect Milky Way Satellite Formation?
Sam Geen, Adrianne Slyz, Julien Devriendt
We use sub-parsec resolution hydrodynamic resimulations of a Milky Way (MW) like galaxy at high redshift to investigate the formation of the MW satellite galaxies. More specificall…