Fornax Dwarf Galaxy

The Fornax Dwarf Spheroidal is an elliptical dwarf galaxy. The galaxy is a satellite of the Milky Way and contains six globular clusters, the largest of which is NGC 1049. The galaxy is also receding from the Milky Way at 53 km/s. It mostly contains population II stars.

Globular clusters

Fornax 4, a globular cluster within this galaxy, is peculiar in that unlike the globular clusters Fornax 1, 2, 3, and 5, which have horizontal branches across a wide range of colors and include RR Lyrae variables, Fornax 4 is found to have only red in its horizontal branch. Fornax 4 is also ~3 Gyr younger than the other globular clusters. The color-magnitude diagram of Fornax 4 has a strong similarity to "young" galactic globular Ruprecht 106.

This leads to two open questions: Why do dwarf spheroidals allow the formation of globular clusters like Fornax 4 and Terzan 7 (of Sagittarius dwarf) long after globular clusters ceased to form in the main body of the Galactic halo? Is it possible that "young" globular clusters of the outer halo like Ruprecht 106 were originally formed in now defunct dwarf spheroidals?