Kavli Affiliate: Martin Haehnelt | Summary:Here we introduce the SEEDZ simulations, a suite of cosmological hydrodynamic simulations exploring the formation and growth of the first massive black holes in the Universe. SEEDZ includes models for Population III star formation, supernovae explosions and the resulting formation of light seed black holes, metal enrichment and subsequent Population […]

Kavli Affiliate: Roberto Maiolino| First 5 Authors: Seunghwan Lim, Seunghwan Lim, , , | Summary:We use the highest-resolution FLAMINGO hydrodynamical simulation to quantify cosmic variance and large-scale coherence in the evolution of massive galaxies at high redshift. FLAMINGO combines a $(1,mathrmcGpc)^3$ volume with baryonic resolution sufficient to identify $gtrsim,10^3$ independent JWST-like survey volumes of $(100,mathrmcMpc)^3$, […]

Kavli Affiliate: Roberto Maiolino | Summary:Direct observations of Lyman continuum (LyC) radiation from galaxies during the Epoch of Reionization (EoR) are impeded by absorption in the intergalactic medium, requiring indirect methods to infer the escape fraction of ionizing photons ($f_rm esc^rm LyC$). One approach is to develop and validate such methods on local analogues of […]

Kavli Affiliate: Martin Haehnelt | Summary:The fraction of "dark pixels" in the Ly$α$ and other Lyman-series forests at $zsim 5-6$ provides a powerful constraint on the end of the reionization process. Any spectral region showing transmission must be highly ionized, while dark regions could be ionized or neutral, thus the dark pixel fraction provides a […]

Kavli Affiliate: Debora Sijacki | Summary:We present a suite of high-resolution simulations to study how different stellar feedback channels regulate the growth of central intermediate-mass black holes (IMBHs) in dwarf galaxies hosting nuclear star clusters (NSCs). We employ a super-Lagrangian refinement scheme to resolve the self-gravity radius of the $α$-accretion disc ($<0.01$~pc) and follow the […]

Kavli Affiliate: Debora Sijacki | Summary:We present a suite of high-resolution simulations to study how different stellar feedback channels regulate the growth of central intermediate-mass black holes (IMBHs) in dwarf galaxies hosting nuclear star clusters (NSCs). We employ a super-Lagrangian refinement scheme to resolve the self-gravity radius of the $α$-accretion disc ($<0.01$~pc) and follow the […]

Kavli Affiliate: Roberto Maiolino | Summary:Galaxy mergers and interactions are often invoked to explain enhanced star formation, black hole growth, and mass build-up of galaxies at later cosmic times, but their effect is poorly understood at high redshift ($z>2$). We use JADES data to analyse a mass-complete sample of 1968 galaxies at $z=3-9$ with $rm […]

Kavli Affiliate: Roberto Maiolino | Summary:We present JWST/NIRSpec dense-shutter spectroscopy (DSS). This novel observing strategy with the NIRSpec/MSA deliberately permits a high number of controlled spectral overlaps to reach extreme multiplex while retaining the low background of slit spectroscopy. In a single configuration over the JADES Origins Field, we opened shutters on all faint (mF444W$<$30 […]

Kavli Affiliate: Kaisey Mandel | Summary:Supernova H0pe is a multiply-imaged Type Ia supernova (SN Ia) and the second lensed SN to yield a measurement of the Hubble constant by the time-delay cosmography method, finding $H_0 = 75.4^+8.1_-5.5 textkm s^-1 textMpc^-1$. We investigate the seven lens modeling approaches used to derive $H_0$, assessing their agreement with […]

Kavli Affiliate: Kaisey Mandel | Summary:Supernova H0pe is a multiply-imaged Type Ia supernova (SN~Ia) and the second lensed SN to yield a measurement of the Hubble constant by the time-delay cosmography method, finding $H_0 = 75.4^+8.1_-5.5 textkm s^-1 textMpc^-1$ (Pascale et. al 2025). We investigate the seven lens modeling approaches used to derive $H_0$, assessing […]