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Título del libro: Proceedings Of The 12th Scientific Meeting Of The Spanish Astronomical Society - Highlights Of Spanish Astrophysics Ix, Sea 2016
Título del capítulo: Garrotxa simulations: Hot gas distribution around Milky Way size galaxies at z=0

Autores UNAM:
PEDRO COLIN ALMAZAN; JOSE OCTAVIO VALENZUELA TIJERINO; YAIR EMMANUEL KRONGOLD HERRERA;
Autores externos:

Idioma:

Año de publicación:
2016
Palabras clave:

Dark Matter; Density of gases; Galaxies; Axisymmetric structure; Dark matter halos; Galaxy simulations; Gas distribution; Huge reservoir; Metallic content; Real distribution; Spatial resolution; Gases


Resumen:

We present a new set of cosmological Milky Way size galaxy simulations using ART. In our simulations the main system has been evolved inside a 28 Mpc cosmological box with a spatial resolution of 109 pc. At z=0 our systems have an Mvir = 6-8×1011 M?. In several of our models we have observed how a well defined disk is formed inside the dark matter halo and the overall amount of gas and stars is comparable with MW observations. Several non-axisymmetric structures arise out of the disk: spirals, bars and also a warp. We have also observed that a huge reservoir of hot gas is present at large distances from the disk, embedded in the dark matter halo region, accounting for only a fraction of the "missing baryons". Gas column density, emission (EM) and dispersion (DM) measure have been computed from inside the simulated disk at a position of 8 kpc from the center and in several directions. Our preliminary results reveal that the distribution of hot gas is non-isotropic according with observations ([6], [7]). Also its metallic content presents a clear bimodality what is a consequence of a recent accretion of a satellite galaxy among others. After a careful analysis we confirm that due to the anisotropy in the gas distribution a new observational parameter needs to be defined to recover the real distribution of hot gas in the galactic halo ([11]). © 2016 Proceedings of the 12th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics IX, SEA 2016. All rights reserved.


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