SIMBAD references

Galaxy evolution is regulated by the interplay between galactic discs and their surrounding medium. We study this interplay by examining how the galactic coronal emission efficiency of stellar feedback depends on the (surface and specific) star formation rates (SFRs) and other parameters for a sample of 52 Chandra-observed nearby highly inclined disc galaxies. We first measure the star-forming galactic disc sizes, as well as the SFRs of these galaxies, using data from the Wide-Field Infrared Survey Explorer, and then show that (1) the specific 0.5-2 keV luminosity of the coronal emission correlates with the specific SFR in a sub-linear fashion: on average, L_X/L_K∝(SFR/M_*)^Γ with Γ=0.29±0.12; (2) the efficiency of the emission L_X/SFR decreases with increasing surface SFR (I_SFR; Γ=-0.44±0.12); and (3) the characteristic temperature of the X-ray-emitting plasma weakly correlates with I_SFR (Γ=0.08±0.04). These results, somewhat surprising and anti-intuitive, suggest that (i) the linear correlation between L_X and SFR, as commonly presented, is largely due to the correlation of these two parameters with galaxy mass; (ii) much of the mechanical energy from stellar feedback likely drives global outflows with little X-ray cooling and with a mass-loading efficiency decreasing fast with increasing I_SFR (Γ <= -0.5); (iii) these outflows heat and inflate the medium around the galactic disks of massive galaxies, reducing its radiative cooling rate, whereas for relatively low-mass galaxies, the energy in the outflows is probably dissipated in regions far away from the galactic discs.