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Astronomy and astrophysics are the study of objects and phenomena that are found beyond our solar system. This combines theoretical simulations and observation with both terrestrial and space-craft-borne instruments of the electromagnetic radiation and high-energy particles emitted by celestial bodies.
Observations have revealed a galaxy that stopped forming stars earlier than expected. This discovery offers clues about when the first galaxies emerged and sheds light on how stars formed when the Universe was in its infancy.
Computer simulations based on the prevailing cosmological model, ΛCDM, reproduce many observed properties of our Universe. But a study of coherent satellite motions in galaxy clusters yields discrepancies that challenge the definition of ‘today’.
Based on physical modelling and using deep-learning tools, a 3D reconstruction of a flare orbiting the black hole Sagittarius A*, at the centre of the Milky Way, provides observational clues to the formation of high-energy flares and the dynamics of black-hole accretion disks.
We report observations of GRB 231115A, positionally coincident with the starburst galaxy M82, that unambiguously qualify this burst as a giant flare from a magnetar, which is a rare explosive event releasing gamma rays.
A three-dimensional reconstruction of a bright flare orbiting the black hole Sagittarius A* is computationally recovered from ALMA light curve data by constraining a neural network with a gravitational model of black holes.
Cosmic rays at petaelectronvolt energies permeate the Milky Way, but their origin is unknown. This Review Article summarizes the physics required to accelerate particles to these ultrahigh energies, and their potential astrophysical sources (‘PeVatrons’).
Observations have revealed a galaxy that stopped forming stars earlier than expected. This discovery offers clues about when the first galaxies emerged and sheds light on how stars formed when the Universe was in its infancy.
Computer simulations based on the prevailing cosmological model, ΛCDM, reproduce many observed properties of our Universe. But a study of coherent satellite motions in galaxy clusters yields discrepancies that challenge the definition of ‘today’.
Based on physical modelling and using deep-learning tools, a 3D reconstruction of a flare orbiting the black hole Sagittarius A*, at the centre of the Milky Way, provides observational clues to the formation of high-energy flares and the dynamics of black-hole accretion disks.
As the eighth anniversary of Nature Astronomy’s opening to submissions nears, we say goodbye to our inaugural Chief Editor, May Chiao, and welcome her successor, Paul Woods, to the helm.
