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A dormant overmassive black hole in the early Universe.
Nature
December 2024
NRC Herzberg, Victoria British Columbia, Canada.
Recent observations have found a large number of supermassive black holes already in place in the first few hundred million years after the Big Bang, many of which seem to be overmassive relative to their host galaxy stellar mass when compared with local relation. Several different models have been proposed to explain these findings, ranging from heavy seeds to light seeds experiencing bursts of high accretion rate. Yet, current datasets are unable to differentiate between these various scenarios.
View Article and Find Full Text PDF"The children of the Sun and Moon are the gardens"-How people, plants, and a living Sun shape life on Tanna, Vanuatu.
PLoS One
November 2024
Center for Plants, People and Culture, New York Botanical Garden, Bronx, NY, United States of America.
Based on original ethnographic and ethnobotanical research, we share how in the cosmology of Tanna, an island in Vanuatu's southernmost province of Tafea, the Sun is viewed as a living, interactive being. Our initial interviews explored knowledge and beliefs concerning individual plant species, then subsequent follow-up interviews further explored topics that emerged therefrom. The results of these interviews are a series of oral narratives of the mytho-historical past involving the Sun, and the description of contemporary practices which are influenced by the Sun.
View Article and Find Full Text PDFSearch for Light Long-Lived Particles in pp Collisions at sqrt[s]=13 TeV Using Displaced Vertices in the ATLAS Inner Detector.
Phys Rev Lett
October 2024
CERN, Geneva, Switzerland.
Article Synopsis
- - The ATLAS experiment at the LHC conducted a search for long-lived particles (LLPs) using a large dataset (140 fb^{-1}) from proton-proton collisions at 13 TeV, focusing on LLPs with masses from 5 to 55 GeV that decay within the inner detector.
- - The study considered scenarios where LLPs are produced from exotic Higgs boson decays and models involving axionlike particles (ALPs).
- - No significant findings above expected background levels were detected, leading to the establishment of upper limits on various production rates involving the Higgs boson and the top quark related to LLPs and ALPs.
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Surveying the distant Universe.
Open Res Eur
June 2024
Institute of Theoretical Astrophysics, University of Oslo, Oslo, N-0315, Norway.
During the most active period of star formation in galaxies, which occurs in the redshift range 1 3, strong bursts of star formation result in significant quantities of dust, which obscures new stars being formed as their UV/optical light is absorbed and then re-emitted in the infrared, which redshifts into the mm/sub-mm bands for these early times. To get a complete picture of the high- galaxy population, we need to survey a large patch of the sky in the sub-mm with sufficient angular resolution to resolve all galaxies, but we also need the depth to fully sample their cosmic evolution, and therefore obtain their redshifts using direct mm spectroscopy with a very wide frequency coverage. This requires a large single-dish sub-mm telescope with fast mapping speeds at high sensitivity and angular resolution, a large bandwidth with good spectral resolution and multiplex spectroscopic capabilities.
View Article and Find Full Text PDFUsing JADES NIRCam photometry to investigate the dependence of stellar mass inferences on the IMF in the early universe.
Proc Natl Acad Sci U S A
October 2024
Steward Observatory, University of Arizona, Tucson, AZ 85721.
Article Synopsis
- Scientists found many bright galaxies from a long time ago (over 13 billion years) and want to understand how they formed stars.
- They looked closely at how different ways of measuring star mass can change our understanding of these galaxies.
- Using special data from the James Webb Space Telescope, they figured out that reducing the estimated star mass by three times didn’t change how these galaxies looked overall.
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