Abstract Details
| Name: Venkat Vijendra Punjabi Affiliation: Savitribai Phule Pune University Conference ID: ASI2018_788 Title : Modeling non-thermal emission from SDSS galaxy groups Authors and Co-Authors : Dr. Surajit Paul Department of Physics, S.P.Pune University Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : In the structural hierarchy, galaxy groups are the intermediate link between the field galaxies and the rich galaxy clusters. Unlike clusters that are formed at the crossroads of cosmic filaments, groups reside inside the filaments itself. Groups being denser than the filamentary material while attracted by the nodal clusters, groups experience tremendous shear force and dynamical friction and get stretched along the filaments. This may introduce a large scale turbulence at the surface of group and filamentary medium and enter the group medium before getting dissipated. Squeezing of groups inside the filaments due to elongation, will also increase the rate of collisions among the constituent galaxies and these interactions inject turbulence and shocks inside the group medium. Such turbulence can easily accelerate ambient charged particles through turbulent re-acceleration and Diffusive Shock acceleration. This can also amplify cosmic magnetic fields through shock compression and turbulent dynamo mechanism to as high as sub micro Gauss level. Its consequence is the production of diffuse synchrotron radio emission that can make groups observable through radio halo emission. We have implemented radio synchrotron emission models on SDSS galaxy group data and our findings will be presented in this poster. |