X-ray emission and star formation history in Spitzer-selected ETGs

With this proposal we focus on a well selected sample of nearby ellipticals forwhich we reliably determine the star formation history from high S/N Spitzer andGALEX observations. We aim at determining the incidence and where possible theproperties of the hot ISM in light of the detailed characteristics of theirstellar population. Chosen galaxies are passively evolving systems, at most witha small episode of recent star formation. In light of current scenario we expectthem to have a sizable hot ISM. We request high quality Xray data to determinethe ISM parameters, such as luminosity, spatial distribution, temperature wherepossible, to explore whether gas properties are homogeneous or whether evensmall perturbations in the SF history can alter the hot gas content. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]