Image Details
Caption: Figure 4.
Two galaxies around Halo 1 (Halos 3 and 5 from Figure 3) were externally enriched in metals by outflows from Halo 1 sufficiently early that their star formation started with Population II. Here we show the cumulative star formation history of Halo 1 and Halo 3. The virial radius of Halo 5 is also shown to the left. The physical extent of the gas projection is about 4 kpc.
© 2025. The Author(s). Published by the American Astronomical Society.