Abstract Details

Name: Ranita Jana
Affiliation: Raman Research Institute
Conference ID: ASI2020_132
Title : Effect of cosmic rays on galactic outflows: how galaxy mass and star formation rate matter
Authors and Co-Authors : Ranita Jana, Siddhartha Gupta, Biman Nath
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : The process of star formation in galaxies often lead to gaseous outflows. Understanding these galactic-scale outflows is important because they play a significant role in galactic evolution. Thermal pressure due to shock heating of the interstellar medium (ISM) has been the focus of most previous studies. The effect of non-thermal pressure components, such as radiation coming out from young stars and cosmic rays (CRs) have also been suggested as important driving mechanisms. However, their effects have not been studied in an idealized set-up. With the help of an idealized simulation, we try to understand how CRs play a role to launch the outflow and later how CRs impact its dynamics and morphology. To study the importance of various parameters, we perform simulations for three different galaxies of halo masses: 10^8, 10^11 and 10^12 Msun, and three constant star formation rates (SFRs). We study the outer shock position, mass loading factor and temperature density distribution of the outflowing gas. We suggest that the dynamical effects of CRs may not be as important as it is usually claimed, rather it can reduce the size of the outflow in most of the cases. These results are useful for a better understanding of the role of different driving mechanisms in the evolution of a galaxy and its circumgalactic medium.