The Hot Winds of Ultraluminous Infrared Galaxies

Ultraluminous infrared galaxies (ULIGs) represent an important stage in thebirth of an ellipitcal galaxy. They are powered largely by starbursts which may drive massive galactic winds. These outflows likely affect the chemical evolution of ellipticals, heat the intergalactic medium, and unveil nascent quasars. From a large Keck II spectroscopic survey, I have selected two ULIGswith strong, blueshifted interstellar absorption lines. These cold clouds must be entrained in a hot outflow. Measurement of the temperature and emission measure of the hot wind are needed to describe the dynamics of the outflow. Only XMM provides the sensitivity required for this spectral analysis, but additional Chandra observations would greatly aid in their interpretation. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]