Resolving a Mystery: What is the Emission Measure of the Local Hot BubblequestionMark

MBM12 is a nearby molecular cloud that absorbs nearly all background emissionfrom O VII and O VIII. Observing diffuse O VII and O VIII towards MBM12 fixesthe emission measure in the Local Hot Bubble (LHB). Suzaku recently observedMBM12 and found the O VII to be 3x brighter than predicted from canonical LHBmodels, although this could have been affected by solar wind charge exchange(SWCX). Fortunately, the SWCX rate is known to vary with time, viewing geometryand solar wind flux, so a second observation would likely detect a change. Wepropose to observe MBM12 with XMMNewton to confirm the recent measurement. Ifconfirmed, this result will require a reanalysis of existing LHB models and atput strong limits on the depletion of Si and Fe relative to O in the LHB. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]