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 […]
Kavli Affiliate: Debora Sijacki | Summary:We review the state of the evidence for the existence and observational appearance of supermassive black hole binaries. Such objects are expected from standard hierarchical galaxy evolution to form after two galaxies, each containing a supermassive black hole, have merged, in the centre of the merger remnant. A complex interaction […]
Kavli Affiliate: Roberto Maiolino | Summary:This paper accompanies Data Release 4 of the JWST Deep Extragalactic Survey (JADES), which presents the full NIRSpec spectroscopy of the survey. We provide spectra of 5190 targets across GOODS-North and GOODS-South (including the Hubble Ultra Deep Field), observed with the low-dispersion (R $sim$ 30-300) prism and three medium-resolution (R […]
Kavli Affiliate: Roberto Maiolino | Summary:Ultra-cool T- (T$_mathrmeff approx$ 500 – 1200 K) and Y-dwarfs (T$_mathrmeff$ $lessapprox 500$ K) have historically been found only a few hundred parsecs from the Sun. The sensitivity and wavelength coverage of the NIRCam instrument on board the James Webb Space Telescope offer a unique method for finding low-temperature brown […]
Kavli Affiliate: Martin Haehnelt | Summary:We present the first constraints on the electron optical depth to reionization, $τ_mathrme$, from the Lyman-$α$ forest alone for physically motivated reionization models that match the reionization’s end-point, $z_rmend$, required by the same astrophysical probe, and for symmetric reionization models with fixed duration, $Δz$, commonly adopted in CMB reionization analyses. […]
Kavli Affiliate: Debora Sijacki | Summary:We present observational evidence for three massive, accreting black holes in the $z=5.0167$ galaxy J0148-4214 from JWST/NIRSpec-IFU spectroscopy. The black holes are revealed through broad H$α$ emission (FWHM = 430-2920 km/s) without a forbidden-line counterpart in the bright [O III] doublet. Channel maps of the asymmetric central H$α$ profile isolate […]
Kavli Affiliate: Roberto Maiolino | Summary:We present observational evidence of three massive, accreting black holes (BHs) in the z=5.0167 galaxy J0148-4214 from JWST/NIRSpec-IFU spectroscopy. The BHs are revealed through broad H$α$ emission (FWHM=430-2920 km/s) without a forbidden-line counterpart in the bright [OIII] doublet. Channel maps of the asymmetric central H$α$ profile isolate two spatially distinct […]
Kavli Affiliate: George Efstathiou | Summary:The 21-cm line of hydrogen is the most promising probe of the Dark Ages and Cosmic Dawn. We combine hydrodynamical simulations with a large-scale grid in order to calculate the effect of non-linear structure formation on the large-scale 21-cm power spectrum, focusing on redshifts $z=20-40$. As the clumping effect arises […]
Kavli Affiliate: George Efstathiou | Summary:The 21-cm line of hydrogen is the most promising probe of the Dark Ages and Cosmic Dawn. We combine hydrodynamical simulations with a large-scale grid in order to calculate the effect of non-linear structure formation on the large-scale 21-cm power spectrum, focusing on redshifts $z=20-40$. As the clumping effect arises […]
Kavli Affiliate: George Efstathiou | Summary:It is thought that the Universe went through an early period known as the Dark Ages, during which primeval density fluctuations grew to form the first luminous objects, marking the beginning of Cosmic Dawn around 100 million years after the Big Bang. The 21-cm line of hydrogen atoms is the […]