Abstract Details
| Name: Priyanka Singh Affiliation: Raman Research Institute Conference ID: ASI2016_482 Title : Suppression of galactic outflows by cosmological infall/circumgalactic medium Authors and Co-Authors : Sandeep Rana, IISER, Mohali. Jasjeet S. Bagla, IISER, Mohali. Biman B. Nath, RRI, Bangalore Abstract Type : Poster Abstract Category : General Relativity and Cosmology Abstract : Galaxies undergo feedback processes such as supernovae and active galactic nuclei giving rise to outflows carrying metal enriched gas into the galactic halo and intergalactic medium (IGM). At the same time, galaxies accrete matter from the IGM. We study the suppression of outflow velocity by the infalling gas. The reduction in the outflow velocity due to the infall depends on the mass and redshift of the galaxy. We find that in the presence of infall, the upper mass limit beyond which there are no outflows, decreases approximately by a factor of two, independent of the redshift of the galaxy. In addition to infall, the existence of hot circumgalactic medium (CGM) in massive galaxies also decelerates the outflows. Together, infall and the hot CGM give a mass limit separating the galaxies with and without unsuppressed outflows. We investigate the relative importance of these two outflow suppression processes as a function of redshift and discuss their impact on the enrichment history of the galaxy and its environment. |