Science, Space and Technology News 2024
New research shows galaxy age as the key factor in star motion, challenging older theories that highlighted environment or mass. Credit: SciTechDaily.com
, has found that the most important factor is neither of these things. It shows the tendency of the stars to have random motion is driven mostly by the age of the galaxy – things just get messy over time. A comparison of a young and old galaxy observed as part of the SAMI Galaxy Survey. Panels on the left are regular optical images from the Subaru Telescope. In the middle are rotational velocity maps from SAMI. On the right are maps measuring random velocities . Both galaxies have the same total mass. The top galaxy has an average age of 2 billion years, high rotation and low random motion. The bottom galaxy has an average age of 12.5 billion years, slower rotation and much larger random motion.
The study allows astronomers to rule out many processes when trying to understand galaxy formation and so fine-tune models of how the Universe has developed.The next steps will be to develop simulations of galaxy evolution with more granular detail.
France Dernières Nouvelles, France Actualités
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