Ritali Ghosh Successfully Defends Her PhD Thesis
Congratulations to Ritali Ghosh on defending her PhD thesis at IISc.
ASGARD Group
We study magnetohydrodynamics (MHD) and radiative transfer (RT) problems to understand how gas moves in and around galaxies. Our work connects theory, simulations, and observations to probe the physics of turbulent, magnetised interstellar gas, galactic inflows and outflows, and the multi-phase circumgalactic and intracluster medium. We aim to predict observable signatures across wavelengths and develop methods to compare models directly to data.
Latest News
Postdoc Position Open
A postdoctoral position is open (see AAS Job Register listing).
Work by Hitesh Featured on the MPA Webpage
Hitesh Kishore Das' recent work was highlighted on the Max Planck Institute for Astrophysics website.
Website is online (work in progress)
The website is now online — content and layout are still under construction.
We hosted some renowned guests
Seok-Jun Chang, Sumnyon Chon, Alankar Dutta and Hitesh Kishore Das visited the group — photos inside.
About
ASGARD (Astrophysical Gas & Radiation Dynamics) is based at the Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie (ZAH), Heidelberg University.
This group investigates the complex interplay of gas dynamics and radiative processes that shape galaxy formation and evolution. We employ high-performance computing and analytical theory to study these fundamental astrophysical phenomena.
Research focuses on
- Radiative Processes & Transfer: modeling resonant line transfer (e.g., Lyman-alpha), ionizing photon escape, and photon–gas interactions to connect theory with observations—particularly those of high-redshift galaxies and their surroundings, as well as the Epoch of Reionization.
- (Magneto-)Hydrodynamics: exploring the dynamics of multiphase gas across diverse astrophysical environments, including the interstellar, circumgalactic, and intracluster medium (ISM, CGM, ICM). We also investigate the broader galactic ecosystem (e.g., galactic winds and fountain flows).
- High-Performance Computing: developing and applying novel numerical methods to model multiscale processes in galaxy formation with high fidelity.
By integrating theoretical insights with computational models and observational data, we aim to advance the understanding of the physical mechanisms governing galaxies and their gaseous environments across cosmic time.
Check out our past or open projects. See our Publications and Projects.
Events
Upcoming events
Latest Publications
Impact of Resonance, Raman, and Thomson Scattering on Hydrogen Line Formation in Little Red Dots
Simulating realistic Lyman- α emitting galaxies including the effect of radiative transfer
Fading in the flow: suppression of cold gas growth in expanding galactic outflows
ABSTRACT
Multiphase outflows, revealed by multiwavelength observations, are crucial in redistributing gas and metals within and around galaxies. These outflows are often modelled theoretically using wind tunnel simulations of a cold ($\sim 10^4$ K) cloud interac...
MOGLI: model for multiphase gas using multifluid hydrodynamics
ABSTRACT
Multiphase gas, with hot ($\sim 10^6$ K) and cold ($\sim 10^4$ K) gas, is ubiquitous in astrophysical media across a wide range of scales. However, simulating multiphase gas has been a long-standing challenge, due to large separation between the size of...
Multi-cloud crushing – the collective survival of cold clouds in galactic outflows
Abstract
The ram-pressure acceleration of cold gas by hot outflows plays a crucial role in the dynamics of multiphase galactic winds. Recent numerical studies incorporating radiative cooling have identified a size threshold for idealized cold clouds to survive w...
This project received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 101165038).