Cambridge – Kavli Institute Pre-Print Publications

The dawn of disks: unveiling the turbulent ionised gas kinematics of the galaxy population at $zsim4-6$ with JWST/NIRCam grism spectroscopy

Posted by klaurent March 27, 2025March 31, 2025Cambridge, This Week: Astrophysics

Kavli Affiliate: Roberto Maiolino | First 5 Authors: A. Lola Danhaive, Sandro Tacchella, Hannah Übler, Anna de Graaff, Eiichi Egami | Summary: Recent studies of gas kinematics at high redshift have reported disky systems which appear to challenge models of galaxy formation, but it is unclear whether they are representative of the underlying galaxy population. […]

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Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe

Posted by klaurent March 27, 2025March 31, 2025Cambridge, This Week: Astrophysics

Kavli Affiliate: George Efstathiou | First 5 Authors: Jiten Dhandha, Thomas Gessey-Jones, Harry T. J. Bevins, Simon Pochinda, Anastasia Fialkov | Summary: In the current era of JWST, we continue to uncover a wealth of information about the Universe deep into the Epoch of Reionization. In this work, we run a suite of simulations using […]

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SAPPHIRES: A Galaxy Over-Density in the Heart of Cosmic Reionization at $z=8.47$

Posted by dbos March 19, 2025Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Yoshinobu Fudamoto, Jakob M. Helton, Xiaojing Lin, Fengwu Sun, Peter Behroozi | Summary: We report the discovery of a galaxy proto-cluster candidate (dubbed MACS0416-OD-z8p5) at a spectroscopic redshift of $zsim8.47$, dating back to $sim550$Myr after the Big Bang. The observations are part of the JWST Cycle-3 treasury […]

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BlackTHUNDER strikes twice: rest-frame Balmer-line absorption and high Eddington accretion rate in a Little Red Dot at $z=7.04$

Posted by dbos March 14, 2025March 26, 2025Cambridge

Kavli Affiliate: Debora Sijacki | First 5 Authors: Francesco D’Eugenio, Roberto Maiolino, Michele Perna, Hannah Uebler, Xihan Ji | Summary: JWST spectroscopy has revealed a population of compact objects at redshifts $z=2$-9 with `v’-shaped spectral energy distributions, broad permitted lines, and, often, hydrogen Balmer absorption. Among these `Little Red Dots’ (LRDs), Abell2744-QSO1 at $z=7.04$ has […]

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BlackTHUNDER strikes twice: rest-frame Balmer-line absorption and high Eddington accretion rate in a Little Red Dot at $z=7.04$

Posted by dbos March 14, 2025March 26, 2025Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Francesco D’Eugenio, Roberto Maiolino, Michele Perna, Hannah Uebler, Xihan Ji | Summary: JWST spectroscopy has revealed a population of compact objects at redshifts $z=2$-9 with `v’-shaped spectral energy distributions, broad permitted lines, and, often, hydrogen Balmer absorption. Among these `Little Red Dots’ (LRDs), Abell2744-QSO1 at $z=7.04$ has […]

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JADES: Average Nitrogen Enhancement in High-Redshift Broad-Line Active Galactic Nuclei

Posted by dbos February 17, 2025February 24, 2025Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Yuki Isobe, Roberto Maiolino, Francesco D’Eugenio, Mirko Curti, Xihan Ji | Summary: The unexpectedly high nitrogen-to-oxygen (N/O) ratios observed in high-redshift (z) galaxies have challenged our understanding of early star formation. Notably, many of these nitrogen-rich galaxies show signatures of active galactic nuclei (AGNs), suggesting a possible […]

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The Power Spectrum of the Thermal Sunyaev-Zeldovich Effect

Posted by dbos February 14, 2025February 24, 2025Cambridge

Kavli Affiliate: George Efstathiou | First 5 Authors: George Efstathiou, Fiona McCarthy, , , | Summary: The power spectrum of unresolved thermal Sunyaev-Zeldovich (tSZ) clusters is extremely sensitive to the amplitude of the matter fluctuations. This paper present an analysis of the tSZ power spectrum using temperature power spectra of the cosmic microwave background (CMB) […]

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Reconstructing the shape of the non-linear matter power spectrum using CMB lensing and cosmic shear

Posted by dbos February 10, 2025February 24, 2025Cambridge

Kavli Affiliate: Blake Sherwin | First 5 Authors: Karen Perez Sarmiento, Alex Laguë, Mathew Madhavacheril, Bhuvnesh Jain, Blake Sherwin | Summary: We reconstruct the non-linear matter power spectrum $P(k)$ using a joint analysis of gravitational lensing of the cosmic microwave background (CMB) and lensing of galaxies. This reconstruction is motivated by the $S_8$ tension between […]

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Constraining the major merger history of $z sim 3-9$ galaxies using JADES: dominant in-situ star formation

Posted by dbos February 3, 2025Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Dávid Puskás, Sandro Tacchella, Charlotte Simmonds, Kevin Hainline, Francesco D’Eugenio | Summary: We present a comprehensive analysis of galaxy close-pair fractions and major merger rates to evaluate the importance of mergers in the hierarchical growth of galaxies over cosmic time. This study focuses on the previously poorly […]

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Cosmological super-resolution of the 21-cm signal

Posted by dbos February 2, 2025February 10, 2025Cambridge

Kavli Affiliate: George Efstathiou | First 5 Authors: Simon Pochinda, Jiten Dhandha, Anastasia Fialkov, Eloy de Lera Acedo, | Summary: In this study, we train score-based diffusion models to super-resolve gigaparsec-scale cosmological simulations of the 21-cm signal. We examine the impact of network and training dataset size on model performance, demonstrating that a single simulation […]

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