Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1240..171s&link_type=abstract
HUNTING FOR THE DARK: THE HIDDEN SIDE OF GALAXY FORMATION. Edited by Victor P. Debattista and Cristina C. Popescu AIP Conferen
Physics
Galaxies, Hydrodynamics, Red Shift, Luminescence, Galaxy Mergers, Collisions, And Tidal Interactions, Hydrodynamics, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Magnitudes And Colors, Luminosities
Scientific paper
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. This contributes to the total X-ray background in the Universe. (iv) ~10-20% of the initial gas mass is unbound from the galaxies for equal-mass mergers. We use an analytical halo merger tree and estimate that >~10% of the total baryon content of the Universe could have been unbound via mergers over the history of the Universe.
Holley-Bockelmann Kelly
Sinha Manodeep
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