Recent Progress in Understanding X-ray Emission From Early-type Galaxies: The Hot Gas ComponentJimmy A. IrwinUniversity of MichiganX-rays From Nearby Galaxies - September 7, 2019IntroductionOrigin of hot gas and metals in ellipticals - stellar mass loss + accretion of gas during/after formation - metal-enriched by Type Ia/II supernovaeTemperature: kT 0.3-1 keVMass up to 1010 MMetallicity: solar for gas-rich systemsMajor outstanding problems: LX vs. Lopt relation metallicity of hot gasLX vs. Lopt