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Paper: A Test for Dark Halos in High-Velocity Clouds
Volume: 240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA
Page: 539
Authors: Lewis, G. F.; Bland-Hawthorn, J.
Abstract: Many high-velocity HI 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 HI masses (>106 Msolar). It has been suggested that these structures may be associated with dark matter `mini-halos' accreting onto the Galactic halo. For a compact HVC along the sight line to a more distant galaxy, we show 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 to map the mass distribution within HVCs.
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