Personal website of Pawel Biernacki

Astrophysics PhD student at University of Zurich

I'm Pawel Biernacki,
a PhD student at University of Zurich

Welcome on my personal website. See below for my research interests and my CV. Feel free to get in touch!

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Pawel Biernacki

Supermassive black holes dynamics in gas-rich galaxies

In this project I have worked on new implementation of supermassive black hole algorithm in the hydrodynamical code RAMSES. We have shown that in high-redshift galaxies supermassive black holes have to co-evolve with nuclear star clusters.
Click on the image for the paper!

The combined effect of AGN and supernovae feedback in launching massive molecular outflows in high-redshift galaxies

We show that both active galactic nuclei and supernova feedback are necessary to 1) quench star formation via preventive feedback and 2) produce massive, fast, "molecular" outflows in high-redshift galaxies.
Click on the image for the paper!

Numerical and physical stability of clusters

In the recent work (lead by Go Ogiya at University of Nice) we have compared the numerical and physical stability of clusters with different implementations of hydrodynamics - particle (GIZMO; TSPH, PSPH and MFM) and grid (RAMSES). It appears that PSPH and especially TSPH suffer from numerical effects. MFM method and RAMSES are in reasonable agreement, but the former suffers from the particle noise.
As a next step we are going to include magnetic fields to see if that stabilises bubbles. Stay tuned!
Click on the image for the paper!

Galaxy clusters

One of the topics I focus on is the evolution of galaxy clusters. I study them either in their full environment (see image to the right), as well as in the idealised cases with my collaborators in and Victoria (Canada).

Come back later for the updates!

Nuclear star clusters and their supermassive black holes

Nuclear star clusters may not only protect supermassive black holes from massive perturbers and support their dynamical evolution, but also help the gas accretion onto these compact objects. In a new suit of simulations we are looking at this connection with very high resolution simulations in an idealised scenario.

This project just started, so stay tuned!

Scientific visualization

I enjoy working on scientific visualization, including volumetric rendering, 3D/360° movies. Check out my gallery on Flickr or visit my YouTube channel for more stuff.

Background image at the top: massive galaxy cluster at z=4 from one of my simulations selected for the exhibition "Framing Science" which accompanied Zurich Film Festival 2017.

Scientific Visualisation

3D 360° movies!

Check the first 3D 360° movie of galaxy group formation rendered with RAMSES and my movie tool RAM - click on the image on the left!

VR Icon: Jon Blackwood,


Click here for my CV