Cos-Gto Warm and Hot ISM in and Near the Milky way

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COS G130M and G160M 20,000 resolution observations will be obtained for 10 AGNs situated beyond Milky Way high velocity clouds. For all objects good O VI line profile observations exist from FUSE and high velocity O VI is detected. The COS observations will be used to obtain high quality absorption line profiles {S/N 30 to 40} for C IV, Si IV and N V in the low and high velocity gas toward each AGN. The high ionization profiles of O VI {from FUSE}, N V, C IV, and Si IV will be compared to low ionization profiles {O I, S II, Si II, Fe II, etc.} in order to evaluate the physical conditions and origins of the highly ionized gas in and near the Milky Way at low and high velocity. The HVCs include Complex C {four lines of sight}, Complex A, WD, WB, and several negative velocity O VI HVCs. Other studies to be undertaken with this data set include studies of the physical conditions and abundances in the cool and warm HVC gas and studies of the physical conditions in low redshift IGM systems detected along the 10 lines of sight.;

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