Efficient formation of massive galaxies at cosmic dawn by feedback-free starbursts
University of California, Santa Cruz · Hebrew University of Jerusalem · +1 more institution
Abstract
ABSTRACT JWST observations indicate a surprising excess of luminous galaxies at z ∼ 10 and above, consistent with efficient conversion of the accreted gas into stars, unlike the suppression of star formation by feedback at later times. We show that the high densities and low metallicities at this epoch guarantee a high star formation efficiency (SFE) in the most massive dark-matter haloes. Feedback-free starbursts (FFBs) occur when the free-fall time is shorter than ∼$1\, {\rm Myr}$, below the time for low-metallicity massive stars to develop winds and supernovae. This corresponds to a characteristic density of ∼$3\!\times \!10^3\, {\rm cm}^{-3}$. A comparable threshold density permits a starburst by allowing…
Citation impact
- FWCI
- 45.05
- Percentile
- 100%
- References
- 145
Authors
5- ADAvishai DekelCorresponding
University of California, Santa Cruz, Hebrew University of Jerusalem
- KCKartick C. Sarkar
Tel Aviv University, Hebrew University of Jerusalem
- YBYuval Birnboim
Hebrew University of Jerusalem
- NMNir Mandelker
Hebrew University of Jerusalem
- ZLZhaozhou Li
Hebrew University of Jerusalem
Topics & keywords
- Physics
- Astrophysics
- Galaxy
- Star formation
- Metallicity
- Stars
- Redshift
- Supernova