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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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