Cambridge – Kavli Institute Pre-Print Publications

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

Posted by dbos February 17, 2025February 19, 2025Cambridge, This Week: Astrophysics

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 19, 2025Cambridge, This Week: Astrophysics

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 19, 2025Cambridge, This Week: Astrophysics

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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The impact of cosmic ray feedback during the epoch of reionisation

Posted by dbos January 28, 2025Cambridge

Kavli Affiliate: Martin Haehnelt | First 5 Authors: Marion Farcy, Joakim Rosdahl, Yohan Dubois, Jérémy Blaizot, Sergio Martin-Alvarez | Summary: Galaxies form and evolve via a multitude of complex physics. In this work, we investigate the role of cosmic ray (CR) feedback in galaxy evolution and reionisation, by examining its impact on the escape of […]

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The case for large-scale AGN feedback in galaxy formation simulations: insights from XFABLE

Posted by dbos January 28, 2025Cambridge

Kavli Affiliate: Debora Sijacki | First 5 Authors: Leah Bigwood, Martin A. Bourne, Vid Irsic, Alexandra Amon, Debora Sijacki | Summary: While cosmological simulations of galaxy formation have reached maturity, able to reproduce many fundamental galaxy and halo properties, no consensus has yet been reached on the impact of `baryonic feedback’ on the non-linear matter […]

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BlackTHUNDER — A non-stellar Balmer break in a black hole-dominated little red dot at $z=7.04$

Posted by dbos January 22, 2025Cambridge

Kavli Affiliate: Debora Sijacki | First 5 Authors: Xihan Ji, Roberto Maiolino, Hannah Übler, Jan Scholtz, Francesco D’Eugenio | Summary: Recent observations from JWST have revealed an abundant population of active galactic nuclei (AGN) and so-called “Little Red Dots” (LRDs) at $2lesssim z lesssim 11$, many of which are characterized by V-shaped UV-to-optical continua with […]

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BlackTHUNDER — A non-stellar Balmer break in a black hole-dominated little red dot at $z=7.04$

Posted by dbos January 22, 2025Cambridge

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Assessing the dark matter content of two quasar host galaxies at z~6 through gas kinematics

Posted by dbos January 15, 2025January 30, 2025Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Qinyue Fei, John D. Sivlerman, Seiji Fujimoto, Ran Wang, Luis C. Ho | Summary: We conduct a study of the gas kinematics of two quasar host galaxies at $zgtrsim6$ traced by the [CII] emission line using ALMA. By combining deep observations at both low and high resolution, […]

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