We measure and quantify properties of galactic outflows and diffuse gas at z \geq 1 in cosmological hydrodynamical simulations performed using the GADGET-3 code containing novel baryonic feedback models .
Our sub-resolution model , MUPPI , implements supernova feedback using fully local gas properties , where the wind velocity and mass loading are not given as input .
We find the following trends at z = 2 by analysing central galaxies having a stellar mass higher than 10 ^ { 9 } M _ { \odot } .
The outflow velocity and mass outflow rate ( \dot { M } _ { out } ) exhibit positive correlations with galaxy mass and with the star formation rate ( SFR ) .
However , most of the relations present a large scatter .
The outflow mass loading factor ( \eta ) is between 0.2 - 10 , with an average \eta \sim 1 .
The comparison Effective model generates a constant outflow velocity as expected from the input fixed wind kick speed , and a negative correlation of \eta with halo mass as opposed to the fixed input \eta .
The shape of the outflows is bi-polar in 95 \% of the MUPPI galaxies .
The MUPPI model produces colder galaxy cores and flatter gas metallicity radial profiles than the Effective model .
The number fraction of galaxies where outflow is detected decreases at lower redshifts , but remains more than 80 \% over z = 1 - 5 .
High SF activity at z \sim 2 - 4 drives strong outflows , causing the positive and steep correlations of velocity and \dot { M } _ { out } with SFR .
The outflow velocity correlation with SFR becomes flatter at z = 1 , and \eta displays a negative correlation with halo mass in massive galaxies .
Our study demonstrates that both the MUPPI and Effective models produce significant outflows at \sim 1 / 10 of the virial radius ; at the same time shows that the properties of outflows generated can be different from the input speed and mass loading in the Effective model .
Our MUPPI model , using local properties of gas in the sub-resolution recipe , is able to develop galactic outflows whose properties correlate with global galaxy properties , and consistent with observations .