Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..419..263s&link_type=abstract
Galaxy Evolution: Emerging Insights and Future Challenges ASP Conference Series, Vol. 419, proceedings of a conference held 11-1
Astronomy and Astrophysics
Astronomy
Scientific paper
Galaxy merger simulations have explored the behavior of gas within a galactic disk, yet the dynamics of hot gas within the galaxy halo has been neglected. We report on the results of high-resolution hydrodynamic simulations of colliding galaxies with hot halo gas. We find that: (i) A strong shock is produced in the galaxy halos before the first passage, increasing the temperature of the gas by almost an order of magnitude to ˜106.3 K. (ii) The X-ray luminosity of the shock is strongly dependent on the gas fraction. It is ≥1039 erg/s for gas fractions larger than 10%. (iii) The hot diffuse gas in the simulation also produces X-ray luminosities as large as 1042 erg/s, contributing to the total X-ray background in the Universe. (iv) Approximately 10-20% of the initial gas mass is unbound from the galaxies for equal-mass mergers, while 3-5% of the gas mass is released for the 3:1 and 10:1 mergers. This unbound gas ends up far from the galaxy and can be a feasible mechanism for metal enrichment of the WHIM. We use an analytical halo merger tree to estimate the fraction of gas mass lost over the history of the Universe.
Holley-Bockelmann Kelly
Sinha Mandira
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