Classification of radio backgrounds at cosmic dawn and 21-cm signal confirmation using neural networks

Kavli Affiliate: George Efstathiou | First 5 Authors: Sudipta Sikder, Anastasia Fialkov, Rennan Barkana, , | Summary: Several ongoing and upcoming radio telescopes aim to detect either the global 21-cm signal or the 21-cm power spectrum. The extragalactic radio background, as detected by ARCADE-2 and LWA-1, suggests a strong radio background from cosmic dawn, which […]


Continue.. Classification of radio backgrounds at cosmic dawn and 21-cm signal confirmation using neural networks

Increased Burstiness at High Redshift in Multi-Physics Models Combining Supernova Feedback, Radiative Transfer and Cosmic Rays

Kavli Affiliate: Debora Sijacki | First 5 Authors: Tibor Dome, Sergio Martin-Alvarez, Sandro Tacchella, Yuxuan Yuan, Debora Sijacki | Summary: We study star formation variability, or burstiness, as a method to constrain and compare different galaxy formation models at high redshift using the Azahar simulation suite. The models range from magneto-hydrodynamics with a magneto-thermo-turbulent prescription […]


Continue.. Increased Burstiness at High Redshift in Multi-Physics Models Combining Supernova Feedback, Radiative Transfer and Cosmic Rays

The eventful life of a luminous galaxy at z = 14: metal enrichment, feedback, and low gas fraction?

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Stefano Carniani, Francesco D’Eugenio, Xihan Ji, Eleonora Parlanti, Jan Scholtz | Summary: JADES-GS-z14-0 is the most distant spectroscopically confirmed galaxy yet, at $z>14$. With a UV magnitude of -20.81, it is one of the most luminous galaxies at cosmic dawn and its half-light radius of 260 pc […]


Continue.. The eventful life of a luminous galaxy at z = 14: metal enrichment, feedback, and low gas fraction?

Improved Halo Model Calibrations for Mixed Dark Matter Models of Ultralight Axions

Kavli Affiliate: George Efstathiou | First 5 Authors: Tibor Dome, Simon May, Alex Laguë, David J. E. Marsh, Sarah Johnston | Summary: We study the implications of relaxing the requirement for ultralight axions to account for all dark matter in the Universe by examining mixed dark matter (MDM) cosmologies with axion fractions $f leq 0.3$ […]


Continue.. Improved Halo Model Calibrations for Mixed Dark Matter Models of Ultralight Axions

Improved Halo Model Calibrations for Mixed Dark Matter Models of Ultralight Axions

Kavli Affiliate: George Efstathiou | First 5 Authors: Tibor Dome, Simon May, Alex Laguë, David J. E. Marsh, Sarah Johnston | Summary: We study the implications of relaxing the requirement for ultralight axions to account for all dark matter in the Universe by examining mixed dark matter (MDM) cosmologies with axion fractions $f leq 0.3$ […]


Continue.. Improved Halo Model Calibrations for Mixed Dark Matter Models of Ultralight Axions

First direct carbon abundance measured at $z>10$ in the lensed galaxy MACS0647$-$JD

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Tiger Yu-Yang Hsiao, Michael W. Topping, Dan Coe, John Chisholm, Danielle A. Berg | Summary: Investigating the metal enrichment in the early universe helps us constrain theories about the first stars and study the ages of galaxies. The lensed galaxy MACS0647$-$JD at $z=10.17$ is the brightest galaxy […]


Continue.. First direct carbon abundance measured at $z>10$ in the lensed galaxy MACS0647$-$JD

Cosmological limits on the neutrino mass sum for beyond-$Λ$CDM models

Kavli Affiliate: Blake Sherwin | First 5 Authors: Helen Shao, Jahmour J. Givans, Jo Dunkley, Mathew Madhavacheril, Frank Qu | Summary: The sum of cosmic neutrino masses can be measured cosmologically, as the sub-eV particles behave as `hot’ dark matter whose main effect is to suppress the clustering of matter compared to a universe with […]


Continue.. Cosmological limits on the neutrino mass sum for beyond-$Λ$CDM models

Witnessing the onset of Reionisation via Lyman-$α$ emission at redshift 13

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Joris Witstok, Peter Jakobsen, Roberto Maiolino, Jakob M. Helton, Benjamin D. Johnson | Summary: $require{mediawiki-texvc}$Cosmic Reionisation commenced when ultraviolet (UV) radiation produced in the first galaxies began illuminating the cold, neutral gas that filled the primordial Universe. Recent James Webb Space Telescope (JWST) observations have shown that […]


Continue.. Witnessing the onset of Reionisation via Lyman-$α$ emission at redshift 13

Witnessing the onset of reionisation via Lyman-$α$ emission at redshift 13

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Joris Witstok, Peter Jakobsen, Roberto Maiolino, Jakob M. Helton, Benjamin D. Johnson | Summary: $require{mediawiki-texvc}$Cosmic Reionisation commenced when ultraviolet (UV) radiation produced in the first galaxies began illuminating the cold, neutral gas that filled the primordial Universe. Recent James Webb Space Telescope (JWST) observations have shown that […]


Continue.. Witnessing the onset of reionisation via Lyman-$α$ emission at redshift 13

Narrow line AGN selection in CEERS: spectroscopic selection, physical properties, X-ray and radio analysis

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Giovanni Mazzolari, Jan Scholtz, Roberto Maiolino, Roberto Gilli, Alberto Traina | Summary: In this work, we spectroscopically select narrow-line AGN (NLAGN) among the $sim 300$ publicly available medium-resolution spectra of the CEERS Survey. Using both traditional and newly identified emission line NLAGN diagnostics diagrams, we identified 52 […]


Continue.. Narrow line AGN selection in CEERS: spectroscopic selection, physical properties, X-ray and radio analysis