2023年11月24日 · Abstract: We extend the analysis of a physical model within the standard cosmology that robustly predicts a high star-formation efficiency (SFE) in massive galaxies at cosmic dawn due to feedback-free starbursts (FFBs). It implies an excess of bright galaxies at z>~10 compared to the standard models based on the low SFE at later epochs, an ...

2024年9月27日 · Abstract: The scenario of feedback-free starbursts (FFB), which predicts excessively bright galaxies at cosmic dawn as observed using JWST, may provide a natural setting for black hole (BH) growth. This involves the formation of intermediate-mass seed BHs and their runaway mergers into super-massive BHs with high BH-to-stellar mass ratios and ...

2023年10月4日 · Abstract: Different star-formation models at Cosmic Dawn produce detectable signatures in the observables of upcoming 21-cm experiments. In this work, we consider the physical scenario of feedback-free starbursts (FFB), according to which the star-formation efficiency (SFE) is enhanced in sufficiently massive halos at early enough times, thus ...

2024年10月3日 · The enhanced SFE is robustly predicted by the physical model of FFB, which is naturally expected preferentially at the high densities and low metallicities present in high-mass halos at cosmic dawn. This mechanism alone can enhance the …

Supermassive BH mass (left) and BH-to-stellar mass ratio (right) as a function of redshift for z ffb = 9 (blue) and 12 (magenta), with m = 10 4 M ⊙. This is either in a hot disk (Eq. , solid) or in a cold disk (Eq. , long-dashed). The FFB-threshold halo properties as a …

2023年3月8日 · Feedback-free starbursts (FFBs) occur when the free-fall time is shorter than ∼ 1 Myr, below the time for low-metallicity massive stars to develop winds and supernovae. This corresponds to a characteristic density of ∼ 3 ×103 cm −3.

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.

The scenario of feedback-free starbursts (FFB), which predicts excessively bright galaxies at cosmic dawn as observed using JWST, may provide a natural setting for black hole (BH) growth. This involves the formation of intermediate-mass seed BHs and their

2023年6月8日 · 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} 1Myr|⁠, below the time for low-metallicity massive stars to develop winds and supernovae.

KITP Conference: Cosmic Dawn Revealed by JWST: The Physics of the First Stars, Galaxies, and Black Holes (Aug 26-29, 2024) Coordinators: Volker Bromm, Roberto Maiolino, Brant Robertson, Rachel Somerville, and Marta Volonteri