RP @astrophga-bot.bsky.social: L. Y. Aaron Yung, Rachel S. Somerville, Kartheik G. Iyer: $\Lambda$CDM is still not broken: empirical constraints on the star formation efficiency at $z \sim 12-30$ https://arxiv.org/abs/2504.18618 https://arxiv.org/pdf/25…
simulations of high-surface density star forming clouds. [7/7 of https://arxiv.org/abs/2504.18618v1]
light-to-mass ratios such as are expected for lower metallicity stellar populations or a top-heavy Initial Mass Function, would result in even lower required star formation efficiencies, comparable to values predicted by high resolution numerical [6/7 o…
similar to those in well-studied lower redshift galaxies, our simple model can account for the observed extreme ultra-high redshift populations with star formation efficiencies that peak at values of 20-65 percent. Bursty star formation, or higher [5/7 …