Chandra survey of nearby highly inclined disk galaxies -- IV: New insights into the working of stellar feedback

Abstract

Galaxy evolution is regulated by the interplay between galactic disks 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 disk galaxies. We first measure the star forming galactic disk 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 {\sl sub-linear} fashion: on average, $L_X/L_K\propto (SFR/M_{\ast }{)}^{\Gamma }$ with $\Gamma =0.29\pm 0.12$; 2) the efficiency of the emission $L_X/SFR$ decreases with increasing surface SFR ($I_{SFR}$; $\Gamma =-0.44\pm 0.12$); and 3) the characteristic temperature of the X-ray-emitting plasma weakly correlates with $I_{SFR}$ ($\Gamma =0.08\pm 0.04$). These results, somewhat surprising and anti-intuitive, suggest that a) the linear correlation between $L_X$ and SFR, as commonly presented, is largely due to the correlation of these two parameters with galaxy mass; b) 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 $I_{SFR}$ ($\Gamma \lesssim -0.5$); c) 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 disks.

accepted by MNRAS

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Cited by in corpus (23)

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• The origin of X-ray coronae around simulated disc galaxies
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• Deep Chandra observations of diffuse hot plasma in M83
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• Tracing the Origins of Hot Halo Gas in Milky Way-Type Galaxies with SMUGGLE
• Quokka-based understanding of outflows (QED) -- II. X-ray metallicity gradients as a signature of galactic wind metal loading
• Soft X-ray line emission from hot gas in intervening galaxy halos and diffuse gas in the cosmic web
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