Description
Studying the hot ($T=10^6$ K) gas phase of the circumgalactic medium (CGM) around late-type galaxies is crucial due to its connection to the missing baryon problem and the open question of how gas accretes onto galaxies to sustain star formation.
We use a simple semi-analytic model assuming hydrostatic equilibrium, radiative cooling and mechanical heating from a central source, to evolve the hot CGM around the Milky Way. In a purely cooling scenario, we show that the gas in the inner few kpc of the system cools within a few Myr, and beyond a few kpc, flows towards the galaxy at a constant rate of 0.2 to 1.0 $\rm M_\odot \ yr^{-1}$. When we include heating, we see that the cooling can be balanced by a continuously emitting central source with energy injection rates around $10^{41-42}\ {\rm erg\ s^{-1}}$. Assuming such a source operates in duty cycles, we show these values are compatible to various estimates of sources that could have created the Fermi- and eROSITA bubbles. This suggests that the source that inflated these bubbles can also keep the CGM from cooling and consequently create a self-regulating cycle that can keep the CGM stable for a long time.
| Talk category | NOVA Network 1 |
|---|---|
| Preference for a talk or poster | Poster |
