What little we know of dark matter comes from calculations based on the glow of surrounding galaxies. The further away we look, however, the dimmer that starlight gets, making it harder to see the subtle influence of this most mysterious of forces.
in the Universe's evolution. Using it to estimate the average mass of distant galaxies and the distribution of dark-matter haloes surrounding them, however, was a first.Masami Ouchi, an astrophysicist from the University of Tokyo.
"But after I gave a talk about a large distant galaxy sample, Hironao came to me and said it may be possible to look at dark matter around these galaxies with the CMB."Lyman-break galaxiesUsing a sample consisting of nearly 1.5 million of these objects collected through the Hyper Suprime-Cam Subaru Strategic Program survey, they went about analyzing patterns in the microwave radiation as seen by the European Space Agency's Planck satellite.
The results provided the researchers with a typical halo mass for galaxies close to 12 billion years in the past, an era that was rather different to the one we see closer to home today.According to standard cosmological theory, the formation of those early galaxies was largely determined by fluctuations in space exaggerating the clumping of matter. Interestingly, these new findings of early galactic masses reflect a clumping of matter that is lower than current favored models predict.Miyatake.
Revisiting existing models on how freshly-baked elements came together to form the first galaxies could reveal gaps that may also explain the origins of dark matter. As faded as the Universe's baby photos are, it's clear they still have quite a story to tell about how we came to be.
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