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- W2246720596 abstract "We introduce a new set of simulations of a Milky Way like galaxy using the AMR code ART + hydrodynamics in a $Lambda$CDM cosmogony. The simulation series is named GARROTXA and follow the formation of a late type galaxy from z=60 with a final virial mass of sim$7.4$times$10$^{11}$M$_{odot}$. This system has no major mergers since z=3 and at z=0 becomes a disk late-type spiral galaxy. Several of its large scale properties fall inside recent observational limits of our Galaxy, like the rotation curve shape, the presence of a stellar bar and flare, and a gaseous disk warp, as well as the stellar and baryonic mass. Here, as a first scientific exploitation of the model we study the total amount and spatial distribution of hot X-ray luminous gas. We do not observe in our models a significant presence of a hot gas thick disk as has been recently discussed in observational studies. The analysis of hot gas mock observations (column density and emission measure) revealed that commonly used hypothesis assumed to derive the total hot gas mass in the MW halo from observations lead to biases of about one order of magnitude. Our results suggest that such hot gas distribution is highly anisotropic and that its total mass can account for a non-negligible portion of the missing cosmic baryons leaving still open the contribution of circumgalactic gas. Finally, we have found a clear correlation between the total hot gas mass and the dark matter halo mass of galactic systems. If confirmed, this correlation can become a new method to constrain the total mass of galaxies, in particular the one of the Milky Way." @default.
- W2246720596 created "2016-06-24" @default.
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- W2246720596 date "2015-04-23" @default.
- W2246720596 modified "2023-10-14" @default.
- W2246720596 title "GARROTXA cosmological simulations of Milky Way like galaxies - I. Hot gas and the missing baryons" @default.
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