# Can stars form in the stellar halo?

The wiki page for Galactic Halo states:

Star formation in the stellar halo of the Milky Way ceased long ago.

In addition, the wiki page for Stellar Halo states:

Astrophysical simulations of galaxies have predicted that stellar halos should have two components; one inner region dominated by stars which formed within the galaxy, and an outer region primarily composed of stars accreted through merger events.

This implies that newly formed stars in the galactic halo of the Milky Way, if any in the first place, do not originate from the halo itself. My question is why? Would it not be possible in theory for stars to form from the galactic corona (before it cools down and fall back into the galactic disc) for example?

Side note: If star formation in the stellar halo of the Milky Way has ceased, how did they even form long ago in the first place?

1 The formula to calculate this is $$v = \sqrt{2k_\mathrm{B}T/m}$$, where $$k_\mathrm{B}$$ is Boltzmann's constant, $$T$$ is the temperature, and $$m$$ is the mass of the particle.
2 The characteristic temperature in a cloud that collapses under gravity but is unable to cool is the "virial temperatur", $$T_\mathrm{vir} \simeq \frac{m}{2 k_\mathrm{B}} \frac{G M_\mathrm{vir}}{R_\mathrm{vir}}$$, where $$G$$ is the gravitational constant, and $$M_\mathrm{vir}$$ and $$R_\mathrm{vir}$$ are the mass and radius of the collapsed cloud. For the Milky Way this evaluates to $$\sim10^7\,\mathrm{K}$$.