Stellar stream beyond Milky Way offers new tool to map dark matter

A globular cluster stellar stream has been discovered beyond the Milky Way, marking the first time such a stream has been observed outside our galaxy. The stream was identified in an ultra-diffuse galaxy, a type of galaxy that emits very little light, and it was detected using advanced astronomical data sets and sophisticated analysis techniques. The discovery is significant because it provides a new tool for mapping dark matter in galaxies beyond the Milky Way. The researchers demonstrated that globular cluster stellar streams can be used to measure dark matter in other galaxies, which is important because dark matter makes up most of the mass in the universe, but its nature remains unknown. The study focused on the ultra-diffuse galaxy UGC9050-Dw1 and presented new estimates of its mass distribution and dark matter content. The results are consistent with previous studies and show that this method works beyond our own galaxy. The discovery opens up new possibilities for studying dark matter in other galaxies and could help in building a broader understanding of how dark matter behaves across different galaxy types. The study was conducted by Ph.D. student Julie Kiel Holm and associate professor Sarah Pearson, along with an international team of researchers. The findings were published in Nature.

AI-generated summary of the original article — see the source for the full story.