%0 Generic %1 sokolowska2015diffuse %A Sokołowska, Aleksandra %A Mayer, Lucio %A Babul, Arif %A Madau, Piero %A Shen, Sijing %D 2015 %K halo simulation xrays %T Diffuse coronae in cosmological simulations of Milky Way-sized galaxies %U http://arxiv.org/abs/1504.04620 %X We investigate the properties of halo gas using three cosmological `zoom-in' simulations of realistic Milky Way-galaxy analogs with varying sub-grid physics. In all three cases, the mass of hot ($T > 10^6$ K) halo gas is $\sim 1\%$ of the host's virial mass. Hot halos extend to 140 kpc from the galactic center and are surrounded by a bubble of warm-hot ($T = 10^5 - 10^6$K) gas that extends to the virial radius. Simulated halos agree well outside 20-30 kpc with the $\beta$-model of Miller $&$ Bregman (2014) based on OVII absorption and OVIII emission measurements. Warm-hot and hot gas contribute up to $80\%$ of the total gas reservoir, and contain nearly the same amount of baryons as the stellar component. The mass of warm-hot and hot components falls into the range estimated for $L^*$ galaxies. With key observational constraints on the density of the Milky Way corona being satisfied, we show that concealing of the ubiquitous warm-hot baryons, along with the ejection of just $20-30 \%$ of the diffuse gas out of the potential wells by supernova-driven outflows, can solve the "missing baryon problem". The recovered baryon fraction within 3 virial radii is $90\%$ of the universal value. With a characteristic density of $\sim 10^-4$ cm$^-3$ at $50-80$ kpc, diffuse coronae meet the requirement for fast and complete ram-pressure stripping of the gas reservoirs in dwarf galaxy satellites, which signals the importance of satellite accretion in the assembly of halos and explains naturally how dSphs lost their gas soon after infall.

@misc{sokolowska2015diffuse, abstract = {We investigate the properties of halo gas using three cosmological `zoom-in' simulations of realistic Milky Way-galaxy analogs with varying sub-grid physics. In all three cases, the mass of hot ($T > 10^6$ K) halo gas is $\sim 1\%$ of the host's virial mass. Hot halos extend to 140 kpc from the galactic center and are surrounded by a bubble of warm-hot ($T = 10^5 - 10^6$K) gas that extends to the virial radius. Simulated halos agree well outside 20-30 kpc with the $\beta$-model of Miller $\&$ Bregman (2014) based on OVII absorption and OVIII emission measurements. Warm-hot and hot gas contribute up to $80\%$ of the total gas reservoir, and contain nearly the same amount of baryons as the stellar component. The mass of warm-hot and hot components falls into the range estimated for $L^*$ galaxies. With key observational constraints on the density of the Milky Way corona being satisfied, we show that concealing of the ubiquitous warm-hot baryons, along with the ejection of just $20-30 \%$ of the diffuse gas out of the potential wells by supernova-driven outflows, can solve the "missing baryon problem". The recovered baryon fraction within 3 virial radii is $90\%$ of the universal value. With a characteristic density of $\sim 10^{-4}$ cm$^{-3}$ at $50-80$ kpc, diffuse coronae meet the requirement for fast and complete ram-pressure stripping of the gas reservoirs in dwarf galaxy satellites, which signals the importance of satellite accretion in the assembly of halos and explains naturally how dSphs lost their gas soon after infall.}, added-at = {2015-04-21T08:11:29.000+0200}, author = {Sokołowska, Aleksandra and Mayer, Lucio and Babul, Arif and Madau, Piero and Shen, Sijing}, biburl = {https://www.bibsonomy.org/bibtex/27973f5b9a77ee8f8ef9e430730408b09/miki}, description = {[1504.04620] Diffuse coronae in cosmological simulations of Milky Way-sized galaxies}, interhash = {f421f93001f73a0a09a6ac0803b95b6a}, intrahash = {7973f5b9a77ee8f8ef9e430730408b09}, keywords = {halo simulation xrays}, note = {cite arxiv:1504.04620Comment: Submitted to ApJ, 5 figures}, timestamp = {2015-04-21T08:11:29.000+0200}, title = {Diffuse coronae in cosmological simulations of Milky Way-sized galaxies}, url = {http://arxiv.org/abs/1504.04620}, year = 2015 }