Abstract Details
| Name: Kartick Chandra Sarkar Affiliation: SRF, Raman Research Institute, Bangalore. Conference ID: ASI2015_662 Title : Effect of hot halo gas on supernovae driven outflows Authors and Co-Authors : 1) Biman B. Nath, Raman Research Institute, Bangalore. 2) Prateek Sharma, Indian Institute of Science, Bangalore. 3) Yuri Shchekinov, Southern Federal University, Rostov-on-Don, Russia Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : Galactic outflows are understood to be crucial in galaxy formation theory and enrichment of the intergalactic medium (IGM). We have studied the effect of the often-neglected hot halo gas on supernova driven outflows from Milky Way (MW) type galaxies. Based on hydrodynamic simulations, we relate the mass loss rates, at different radii and times, with the central star formation rate (SFR). We find that the time averaged mass loss rate at the virial radius scales roughly linearly with the SFR ($\dot{M} \propto {\rm SFR}^{0.85}$). The temperature distribution of the outflowing material within 10 kpc is found to be bimodal in nature, peaking at $10^5$ K and $10^{6.5}$ K, responsible for optical and X-ray emission. We show that the warm ($T < 10^{5.5}$ K) mass loading factor ($\eta_{3e5}$=mass outflow rate/SFR, commonly used in observations) can be connected to the mass loading factor at the virial radius ($\eta_v$) as $\eta_v \sim 2 \times \eta_{3e5}$. This link between observed outflow rate at inner region and expected rate at the virial radius is important for cosmological simulations which do not resolve galaxies and depend on feedback prescriptions. |