The First Stars in The Universe

Abstract

Large telescopes have allowed astronomers to observe galaxies that formed as early as 850 million years after the Big Bang. We predict when the first star that astronomers can observe formed in the universe, accounting for the first time for the size of the universe and for three essential ingredients: the light travel time from distant galaxies, Poisson and density fluctuations on all scales, and the effect of very early cosmic history on galaxy formation. We find that the first observable star is most likely to have formed 30 million years after the Big Bang (at redshift 65), much earlier than previously expected. Also, the first galaxy as massive as our own Milky Way likely formed when the universe was only 400 Myr old (at redshift 11). We also show that significant modifications are required in current methods of numerically simulating the formation of galaxies at redshift 20 and above.

5 pages, 4 figures, MNRAS Letters, revised version

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• Robust Velocity-induced Acoustic Oscillations at Cosmic Dawn
• Globular Clusters and Dark Satellite Galaxies through the Stream Velocity
• Supersonic Relative Velocity between Dark Matter and Baryons: A Review
• Relative Likelihood for Life as a Function of Cosmic Time
• On the faint-end of the high-$z$ galaxy luminosity function
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• Gas in Simulations of High Redshift Galaxies and Minihalos
• On the implementation of the spherical collapse model for dark energy models
• The Habitable Epoch of the Early Universe
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• Detecting Early Galaxies Through Their 21-cm Signature
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• An Observational Limit on the Earliest GRBs
• Where can we really find the First Stars' Remnants today?
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• The 21-cm Signal from the Cosmological Epoch of Recombination
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• Cosmic Reionization and the First Nonlinear Structures in the Universe
• Galaxy Formation and Symbiotic Evolution with the Inter-Galactic Medium in the Age of ELT-ANDES
• Random Primordial Magnetic Fields and the Gas Content of Dark Matter Halos
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• Cosmological Constant from Boundary Condition and Its Implications beyond the Standard Model
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• Extended Hernquist-Springel formalism for cosmic star formation
• The haloes that reionized the Universe
• A bubble size distribution model for the Epoch of Reionization
• Effect of the cosmological transition to metal-enriched star-formation on the hydrogen 21-cm signal
• Use of Redshifts as Evidence of Dark Energy