Kavli Affiliate: Kaisey Mandel | Summary:The present day peculiar velocity-field was sourced by primordial density fluctuations and sculpted over the lifespan of the Universe. Cosmological models such as $Λ$CDM make predictions for various statistical properties of peculiar velocities. Bulk flow, the average velocity within a given volume, has an expectation value of $vec0$ due to […]
Kavli Affiliate: Anthony Challinor | Summary:The thermal Sunyaev–Zel’dovich (tSZ) power spectrum is a sensitive probe of cosmology and cluster astrophysics, but its statistics are non-Gaussian because the signal receives a significant contribution from rare, massive, low-redshift galaxy clusters. As a result, a Gaussian likelihood fails to describe the statistics of its power spectrum on large […]
Kavli Affiliate: Roberto Maiolino | Summary:We analyse the cluster content of the $sim 4.5 text deg^2$ XMM-LSS and CDFS VIDEO fields which are expected to be partially covered by the upcoming MOONRISE survey. Using AMICO and WaZP photometric redshift-based cluster finders, we construct a sample of $519$ cluster candidates detected by both finders in the […]
Kavli Affiliate: Roberto Maiolino | Summary:We present gas-phase metallicities of star-forming galaxies at $z=1$-10 with deep JWST/NIRSpec spectra from the JADES full data release, Dark Horse, and OASIS programmes. We stack $sim$1500 medium-resolution spectra, yielding detections of the [OIII]$λ$4363 auroral line down to $12+log(mathrmO/H)=7.0$ to derive stack-based strong-line calibrations over the metallicity range $12+log(mathrmO/H)=7.0$-8.7. At […]
Kavli Affiliate: Roberto Maiolino | Summary:The Centaurus cluster is one of the most important archetypes of radio-mode AGN feedback, with its central galaxy, NGC 4696, launching powerful jets that inflate X-ray cavities and regulate cooling and star formation. NGC 4696 lies within a spectacular multiphase nebula of filaments extending over tens of kiloparsecs and spanning […]
Kavli Affiliate: George Efstathiou | Summary:We investigate the impact of mixed cold and fuzzy dark matter (MDM) cosmologies on the halo mass function (HMF) using numerical simulations performed with the AxiREPO framework. We consider models in which an ultralight axion-like component with mass $m =10^-24.5 mathrmeV$ constitutes a fraction $f leq 0.3$ of the total […]
Kavli Affiliate: Blake Sherwin | Summary:Ultralight axions (ULAs) are well-motivated dark matter particle candidates that arise in many extensions of the Standard Model of particle physics. ULAs with mass $m_mathrma lesssim 10^-27$ eV have been strongly constrained by cosmic microwave background (CMB) observations in temperature and polarization. We fit recent measurements of gravitational lensing of […]
Kavli Affiliate: Martin Haehnelt | Summary:James Webb Space Telescope (JWST) surveys of [O III]-emitting galaxies are offering fresh insight into the connection between galaxies and the intergalactic medium at redshift z ~ 6. Recent measurements of the cross-correlation between [O III]-emitting galaxies and Ly $α$ forest transmission present an apparent challenge to numerical models. Here […]
Kavli Affiliate: Roberto Maiolino | Summary:The rapid accumulation of massive dust reservoirs in the early Universe remains a major challenge in astrophysics. While core-collapse supernovae can inject large dust grains ($a gtrsim 0.1,μrm m$) on short timescales, explaining the total dust budgets in the early Universe likely requires efficient grain growth in the interstellar medium […]
Kavli Affiliate: Anthony Challinor | Summary:Efficient computation of the angular bispectrum is an essential part of modelling large-scale structure observations, but it still remains an extremely challenging task. In this work, we compute the tree-level, unequal-time angular bispectrum in both real and redshift space. By deriving full-sky results, we show that the bispectrum can be […]