Abstract
ABSTRACTMany high‐velocity H i clouds (HVCs) are now believed to be scattered throughout the Galactic halo on scales of tens of kiloparsecs. Some of these clouds appear to contain substantial H i masses (> 106 M⊙). It has been suggested that these structures may be associated with dark matter “minihalos” accreting onto the Galactic halo. For a compact HVC along the sight line to a more distant galaxy, we demonstrate that “pixel gravitational lensing” provides a crucial test for the presence of a dark halo in the form of massive compact objects. The detection of pixel lensing will provide an independent means of mapping the mass distribution within HVCs.
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