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We aim at addressing the questions related to galaxy mass assembly throughmajor and minor wet merging processes in the redshift range 1<z<2. A consequentfraction of Milky Way like galaxies are thought to have undergone an unstableclumpy phase at this early stage. Using the adaptive mesh refinement codeRAMSES, with a recent physically-motivated implementation of stellar feedback,we build the Merging and Isolated high-Redshift Adaptive mesh refinementGalaxies (MIRAGE) sample. It is composed of 20 mergers and 3 isolated idealizeddisks simulations with global physical properties in accordance with the 1<z<2mass complete sample MASSIV. The numerical hydrodynamical resolution reaches 7parsecs in the smallest Eulerian cells. Our simulations include: starformation, metal line cooling, metallicity advection, and a recentimplementation of stellar feedback which encompasses OB-type stars radiativepressure, photo-ionization heating, and supernovae. The initial conditions areset to match the z~2 observations, thanks to a new public code DICE. Thenumerical resolution allows us to follow the formation and evolution of giantclumps formed in-situ from Jeans instabilities triggered by high initial gasfraction. The star formation history of isolated disks shows stochastic starformation rate, which proceeds from the complex behavior of the giant clumps.Our minor and major gas-rich merger simulations do not trigger starbursts,suggesting a saturation of the star formation in a turbulent and clumpyinterstellar medium fed by substantial accretion from the circum-galacticmedium. Our simulations are close to the normal regime of the disk-like starformation on a Schmidt-Kennicutt diagram. The mass-size relation and its rateof evolution matches observations, suggesting that the inside-out growthmechanisms of the stellar disk do not necessarily require to be achievedthrough a cold accretion.

astronomy and astrophysics

Evolution of the mass, size, and star formation rate in high-redshift  merging galaxies MIRAGE - A new sample of simulations with detailed stellar  feedback