All articles tagged with #sagittarius a
A new study proposes the Milky Way’s central mass could be a dense fermionic dark matter core rather than Sagittarius A*, capable of reproducing the observed fast S-star orbits and the galaxy’s Keplerian rotation decline, and it might even mimic the black hole shadow seen by the Event Horizon Telescope; while provocative, the idea isn’t yet proven and future observations are needed to confirm or refute it.
New research suggests the Milky Way’s central mass, traditionally attributed to the black hole Sagittarius A*, could instead be a dense fermionic dark matter core. The observed orbits of stars like S2 and Gaia rotation curves fit both a black hole and this dark-matter model, meaning current data cannot distinguish them. If the dark matter interpretation holds, it would imply a continuous dark-matter structure linking the galactic center to the halo, reshaping our view of the Milky Way’s mass distribution. Future observations, including higher-resolution EHT data and longer-term stellar monitoring, could resolve the true nature of Sgr A*.
Columbia University and Breakthrough Listen identify an 8.19-millisecond pulsar candidate near the Milky Way’s Sagittarius A*, with follow-up observations underway; confirming it could enable precision tests of General Relativity around the galaxy’s central supermassive black hole.
A new study argues the Milky Way’s centre could be a dense dark-matter core wrapped in a halo, potentially mimicking a black hole’s gravity and explaining the rapid orbits of S-stars as well as the shadow seen by the Event Horizon Telescope.
Simulations show a dense dark matter core at the Milky Way’s center could mimic Sagittarius A*’s gravity, matching observed orbital data as well as a black hole and aligning with Gaia DR3, but the model isn’t decisively better yet; next-gen instruments will test whether dark matter could truly dominate the Galactic Center.
NASA's Chandra X-ray Observatory released CSC 2.1, a vastly expanded catalog with more than 400,000 X-ray sources and 1.3 million detections up to 2020, plus new imagery of the Galactic Center around Sagittarius A* and a 22-year sonification of Chandra data—demonstrating cross-mission science with JWST and Hubble and that Chandra continues observing beyond 2021.
AI analysis of the Milky Way's central black hole, Sagittarius A*, suggests it spins rapidly with a high spin parameter and a slight tilt, providing new insights into its behavior and structure, aided by advanced machine learning techniques and upcoming telescope upgrades.
Scientists have made a significant breakthrough in detecting winds from the Milky Way's central black hole, Sagittarius A*, by observing a cone-shaped region of cold gas being blown away, which aligns with hot plasma emissions, providing new insights into the black hole's influence on galaxy evolution.
A new study using machine learning on Event Horizon Telescope data suggests that the Milky Way's central black hole, Sagittarius A*, is spinning at near maximum speed with its axis almost directly pointing at Earth, providing insights into its orientation and activity.
A new AI model trained on noisy telescope data suggests the supermassive black hole at our galaxy's center, Sagittarius A*, is spinning at nearly top speed and its rotational axis points toward Earth, but experts caution that the data quality may affect the accuracy of these findings.
A new AI model has been used to enhance images of the black hole Sagittarius A* at the center of our galaxy, revealing it spins at nearly top speed, but experts caution that the data quality and AI's reliability need further validation before drawing definitive conclusions.
A team of astronomers trained a neural network on millions of synthetic black hole data sets, leading to new insights such as the black hole at the center of our galaxy spinning near its maximum speed and challenging existing theories about accretion disks and magnetic fields, with future data expected to further test the theory of relativity.
Over the past 25 years, black hole research has made significant strides, including capturing the first image of a black hole, measuring the mass of the Milky Way's black hole, detecting gravitational waves from black hole mergers, and discovering intermediate-mass black holes. The James Webb Space Telescope has also found ancient supermassive black holes, challenging existing growth theories. These advancements have transformed our understanding of these cosmic phenomena.
The Event Horizon Telescope (EHT) collaboration has discovered strong magnetic fields spiraling around the supermassive black hole at the center of the Milky Way, named Sagittarius A* (Sgr A*). By studying Sgr A* in polarized light, astronomers have found similarities with the much larger black hole at the center of the Messier 87 galaxy (M87*), suggesting universal processes among supermassive black holes. The findings, reported in two papers, provide insights into the interaction of black holes with surrounding matter and will refine theoretical models. The EHT is scheduled to observe Sgr A* again with more telescopes participating, allowing for observations in more frequencies.
The Event Horizon Telescope collaboration has released a mesmerizing new image of the Sagittarius A* black hole at the center of the Milky Way, showing its strong, twisted, and organized magnetic fields in unprecedented detail. The polarized light image reveals a striking spiral structure, similar to a doughnut with swirls, and offers a new view of the black hole's magnetic field. Comparisons with the M87* black hole suggest that strong and ordered magnetic fields are critical to how black holes interact with the gas and matter around them.