Abstract
Shadow observations are the only way to observe emission from the galactic
halo (GH) and/or the circumgalactic medium (CGM) free of any foreground
contamination from local hot bubble (LHB) and solar wind charge exchange
(SWCX). We analyzed data from a shadow observation in the direction of the high
latitude, neutral hydrogen cloud MBM 16 with \Suzaku. We found that all
emission can be accounted for by foreground emission from LHB and SWCX, plus
power law emission associated with unresolved point sources. The GH/CGM in the
direction of MBM 16 is negligible or inexistent in our observation, with upper
limits on the emission measure of 9.5x10^{-4} pc cm^{-6} (90% C.L.), at the
lowest end of current estimates.
