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

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

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop...93s&link_type=abstract

XMM-Newton Proposal ID #05529201

Physics

Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, Mbm12, Xmm-Newton Proposal Id #05529201

Scientific paper

MBM12 is a nearby molecular cloud that absorbs nearly all background emission from O VII and O VIII. Observing diffuse O VII and O VIII towards MBM12 fixes the emission measure in the Local Hot Bubble (LHB). Suzaku recently observed MBM12 and found the O VII to be 3x brighter than predicted from canonical LHB models, although this could have been affected by solar wind charge exchange (SWCX). Fortunately, the SWCX rate is known to vary with time, viewing geometry, and solar wind flux, so a second observation would likely measure a different SWCX value. We propose to observe MBM12 with XMM-Newton to confirm the recent measurement. If confirmed, this resultwill require a reanalysis of existing LHB models and put strong limits on the depletion of Si and Fe relative to O in the LHB.

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