Supernovae driven outflow in circumgalactic medium and the Fermi Bubbles

Kartick Chandra Sarkar (RRI/ISS) - January 30, 2017 at 12:10 pm

The movement of gas in and out of a galaxy plays crucial role in dictating the evolution of the galaxy. The presence of a circumgalactic medium (CGM) in massive galaxies (>~ 10^12 Msun) complicates the situation while compared to a low mass galaxy. Recent detection of cold/warm gas in almost all the galaxies has baffled the community as to what is the origin and nature of this cold/warm gas. In this talk I will discuss the effect of CGM on supernovae-driven outflows. I will show how mass loading factor can change due to the presence of CGM and how the observations can be affected by the multiphase nature of such outflows. I will also discuss the possible origin of cold gas in such cases. Not only producing multiphase gas, the interaction between outflow and CGM can also host high energy phenomena and shine across the electromagnetic spectrum. One such example is the Fermi Bubbles in our Galaxy. If time permits, I will also discuss our modelling of Gamma-rays, X-rays, radio haze and UV absorption lines related to the Fermi Bubbles and obtained constrains on the nature and strength of the driving engine.

The seminar will be held in 131A Campbell Hall.

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