Linked from
The 10 pages that link to Galactic halo, each with the reason it gives.
Globular clusterRelated: Many globular clusters orbit far beyond their galaxy’s bright disk.
Galactic bulgeCompared with: The halo is also spheroidal, but extends far beyond the central bulge.
Stellar streamRelated: Many stellar streams orbit through the Milky Way’s halo.
Population II starRelated: Many of the Milky Way’s oldest Population II stars occupy this region.
Sombrero GalaxyRelated: A broad stellar halo surrounds the Sombrero Galaxy’s bright disk and bulge.