The Interaction of Hot and Cold Gas Within Galaxies

Sa galaxies have roughly equal amounts of hot and cold gas, yet little is knownabout the interaction between the two phases. It is possible that the gas isthermally coupled, with cold gas cooling hot gas where the two phases interface.This would lead to a softening of the Xray spectrum in the area of overlap.Alternatively, the phases could be thermally isolated, so that the cold gas infront of the hot gas absorbs soft Xrays behind it. We propose to observe the Sagalaxy ICvirgul5267, which has an unusual HI distribution to search for theinteraction between the two phases of its interstellar medium. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]