Ramses User Meeting 2019

Session

Galaxy Clusters

30 Sept 2019, 13:40

Niels Bohr Institute

10. A hydrodynamical simulation of the Virgo cluster of galaxies

Jenny Sorce (CRAL)

30/09/2019, 13:40

At about 15 Mpc from us, the Virgo cluster of galaxies is a formidable source of information to study cluster formation and galaxy evolution in this rich environment. Several observationally-based scenarios for the cluster formation arose within the past decade regarding the number and properties of the galaxies that entered the cluster recently and the nature of the last major merger that the...

11. Hierarchical fragmentation in high redshift galaxies revealed by hydrodynamical simulations

Mr Baptiste Faure (CEA)

30/09/2019, 14:00

High redshift galaxies have a very different morphology than nearby ones. Indeed, the high gas fraction in such galaxies drives strong gravitational instabilities which lead to fragmentation and formation of giant star forming structures of masses up to $10^8$ and $10^9$ \msun often dubbed «giant clumps». Recent observations with high resolution questioned the existence of the giant clumps by...

12. Cold gas formation in galaxy clusters

Dr Beckmann Ricarda (Institut d'Astrophysique de Paris)

30/09/2019, 14:20

Extended filamentary nebulae of cold, dense gas are a striking feature or nearby galaxy clusters, but their formation mechanism and the processes which shape their morphology remain poorly understood. In this talk, I will present work investigating the condensation and evolution of this cold gas under the influence of a spin-driven AGN jet in a Perseus-like clusters.

14. Measuring the dark matter velocity anisotropy to the cluster edge

Mr Jacob Svensmark

30/09/2019, 15:10

Dark matter dominates the properties of large cosmological structures such as galaxy clusters, and the mass profiles of the dark matter have been measured for these equilibrated structures for years using X-rays, lensing or galaxy velocities. A new method has been proposed, which should allow us to measure a dynamical property of the dark matter, namely the velocity anisotropy. For the gas a...

15. The Properties and Evolution of High Redshift Filaments

Mr Marius Ramsoy (University of Oxford)

30/09/2019, 15:30

Cold mode accretion filaments are extremely important in determining the morphology of galaxies at high redshifts, being responsible for transporting around 90% of a galaxy's mass and angular momentum. Unfortunately these structures are nearly invisible to current instruments despite numerous pieces of indirect evidence. With simulations however we can bypass these limitations to study their...

13. The star-gas misalignment from Horizon-AGN

Mr Donghyeon Khim (Yonsei University)

30/09/2019, 15:50

We have explored star-gas misalignment using Horizon-AGN simulation and compared the result with Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. While stars and gas are expected to have aligned rotational axes in a galaxy, IFU observations found that about 11% of the observed galaxies are misaligned. Horizon-AGN showed the distribution of misalignment angles found by...