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The JWST Emission-Line Survey: extending rest-optical narrow-band emission-line selection into the Epoch of Reionization
Get PDFWe present the JWST Emission-Line Survey (JELS), a JWST imaging programme exploiting the wavelength coverage and sensitivity of the Near-Infrared Camera (NIRCam) to extend narrow-band rest-optical emission-line selection into the Epoch of Reionization (EoR) for the first time, and to enable unique studies of the resolved ionized gas morphology in individual galaxies across cosmic history. The primary JELS observations comprise m narrow-band imaging over arcmin designed to enable selection of H emitters at and a host of novel emission-line samples, including [O iii] () and Paschen (). For the F466N/F470N narrow-band observations, the emission-line sensitivities achieved are up to more sensitive than current slitless spectroscopy surveys (5 limits of 0.8–1.2), corresponding to unobscured H star formation rates (SFRs) of 0.9–1.3 at , extending emission-line selections in the EoR to fainter populations. Simultaneously, JELS also adds F200W broad-band and F212N narrow-band imaging (H at ) that probes SFRs fainter than previous ground-based narrow-band studies (), offering an unprecedented resolved view of star formation at cosmic noon. We present the detailed JELS design, key data processing steps specific to the survey observations, and demonstrate the exceptional data quality and imaging sensitivity achieved. We then summarize the key scientific goals of JELS, demonstrate the precision and accuracy of the expected redshift and measured emission-line recovery through detailed simulations, and present examples of spectroscopically confirmed H and [O iii] emitters discovered by JELS that illustrate the novel parameter space probed
The accreted stellar haloes of Milky Way-mass galaxies as a probe of the nature of the dark matter
Get PDFGalactic stellar haloes are largely composed of the remnants of galaxies accreted during the assembly of their host galaxies, and hence their properties reflect the mass spectrum and post-accretion evolution of their satellites. As the nature of dark matter (DM) can affect both, we explore how the properties of the accreted stellar component vary across cold (CDM), warm (WDM), and self-interacting (SIDM) models. We do this by studying accreted stellar populations around eight Milky Way-mass haloes using cosmological hydrodynamical simulations based on the eagle galaxy formation model, in which we find that the accreted stellar mass remains similar across models. Contrary to WDM, which only presents minor differences relative to CDM, the distribution of accreted stars in SIDM changes significantly within (). The central density reduces to and has a shallower radial dependence, with logarithmic density slopes of versus . Additionally, stars are on more tangential orbits than their CDM counterparts, with a change in the velocity anisotropy of . Finally, SIDM stellar haloes have the largest number and prominence of overdensities in radius versus radial velocity space. This is due to a combination of shorter stellar halo progenitor merging time-scales and shallower host potentials, with the former resulting in less time for dynamical friction and radialization to operate. In summary, we show that the phase-space structure of galactic stellar haloes encode key information that can be used to distinguish and rule out different DM models
Demie, F. (2025, September 11). Improving Diversity, Recruitment, and Retention of Ethnic Minority Teachers in London Schools: Challenges for Policy and Practice. Presented at BERA Conference 2025, University of Sussex.
No full textThis session shares the research findings investigating the diversity, recruitment, and retention of ethnic minority teachers in London schools. Three research questions were used to guide this study:1. What does the trend data tell us about disproportionality in the teaching workforce?2. What are the barriers to retention and recruitment? Evidence from the surveyEvidence from teachers' interviews3. What are the implications for SchoolsHeadteachers and governing bodiesLA and MATGovernment policy makersQuestions and Answer
A ring around the Earth: new evidence for an old idea
Get PDFDid the Earth, as a 2024 study suggests, once have a ring? A romantic idea indeed, but as Brian K Tanner explains, it's one that dates back at least as far as the Romantic era
Prospects for Neurodivergent Liberation Theology
No full textTheological ethicists Caleb Day and Jonathan Dunn track the emergence of neurodivergent liberation theologies as part of the Critical Neurodiversity Studies Conference takeover
Christian Forgiveness as an Unconditioned Inalienable Gift: Beyond the Unconditional/Conditional Binary
No full textRedox-regulated Aux/IAA multimerization modulates auxin responses
Get PDFReactive oxygen species (ROS) function as key signals in plant adaptation to environmental stresses, such as drought. Roots respond to transient water unavailability by temporarily ceasing branching through the acclimative response xerobranching. In this study, we report how a xerobranching stimulus triggers rapid changes of ROS levels in root nuclei, triggering redox-dependent multimerization of the auxin repressor protein IAA3. Mutations in specific cysteine residues of IAA3 disrupt redox-mediated multimerization and interaction with co-repressor TPl, thereby attenuating IAA3-mediated target gene repression. Other AuX/IAA proteins also vary in their redox-mediated multimerization, which reveals a regulatory mechanism that connects dynamic changes in cellular redox status to auxin signaling. Our study reveals how ROS, auxin, and water availability intersect and shape root adaptive responses, thereby maintaining phenotypic plasticity in plants
Evolving Patterns of Ethnic Segregation in English Schools: A Decomposition Analysis
Get PDFThe proportion of ethnic minority pupils in English schools has seen a marked increase since the 2000s, now comprising about a third of the state school population. This demographic shift, influenced by factors like birth rates, immigration, and age structures, has significantly diversified the ethnic and linguistic landscape in schools. This paper seeks to understand the effect of this change on ethnic segregation in schools, particularly considering the complex interplay of demographics, residential patterns, and education policies. Despite common perceptions of increasing segregation, research suggests a more nuanced reality. This study aims to provide a comprehensive analysis of ethnic segregation trends in English schools over the past two decades, focusing on multi‐group and multi‐scale perspectives. Employing the decomposable entropy‐based measures, the research examines how evolving demographics affect segregation patterns. Findings reveal a general decline in between‐school segregation, with notable geographical variations. London shows decreased statistical segregation at the school level. In contrast, areas like Yorkshire maintain persistently high levels of ethnic segregation. The study also scrutinises the effect of education reforms like academisation, indicating minimal changes in ethnic composition during conversion to academies, yet highlighting some academies' less representative ethnic makeup compared to other schools. This paper contributes to the understanding of ethnic segregation in education, highlighting the complexities and regional disparities, and challenges prevailing notions by showcasing the multifaceted nature of ethnic diversity and segregation in English schools
Pure spin current polarizer enabled by antiferromagnetic insulator
Get PDFPure spin current enables the transport of spin information without charge flow, providing opportunities for next-generation information technologies. A pure spin current polarizer, capable of controlling both its transmittance and spin polarization, is critical for the development of spintronics; however, it has not yet been demonstrated. Here, we demonstrate a highly efficient pure spin current polarizer at room temperature using a single-domain antiferromagnetic insulator film, through structural engineering and spin-lattice coupling. Our device exhibits a large differential magnon current transmittance at room temperature. Remarkably, we find that the spin polarization of the transmitted magnon current aligns with the Néel vector of the polarizer. This enables a large modulation of damping-like torque and generation of out-of-plane-polarized magnon current, offering alternative routes for developing energy-efficient spintronic devices. We anticipate that this pure spin current polarizer will serve as a building block for spintronics based on pure spin current
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