All articles tagged with #x ray astronomy
XRISM observations reveal that Gamma Cassiopeiae’s peculiar X-rays come from matter falling onto a hidden white-dwarf companion, solving a 160-year mystery and prompting new models of binary evolution in Be-star systems.
Astronomers using JWST have spotted hundreds of compact “little red dots” in the early universe; among them, 3DHST-AEGIS-12014 stands out for its X‑ray emission, suggesting it may be a transitional object between a black‑hole–related phase and the growth of a supermassive black hole in a forming galaxy. If confirmed, this rare LRD could help explain how SMBHs began to grow in the first billions of years, though its exact nature, environment, and evolution remain open questions and will require further observations.
Astronomers using JWST and Chandra found an unusual X-ray-bright “little red dot” (3DHST-AEGIS-12014) about 11.8 billion light-years away, suggesting it may be a transitional object linking black hole stars to the growth of early supermassive black holes. Its X-ray emission could escape through holes in surrounding gas clouds, explaining variability and offering a potential link between LRDs and SMBHs in the young universe, though further observations are needed to confirm the scenario and its implications for black hole formation.
A match between JWST observations of distant, cool “little red dots” and archival Chandra X-ray data has found an X-ray source at one dot’s location, bolstering the idea that these objects are gas clouds hosting growing supermassive black holes and possibly representing a transitional stage in how black holes and their host galaxies form.
JWST observations of the enigmatic 'little red dots' align with a Chandra X-ray source at 3DHST-AEGIS-12014, bolstering the idea that these distant, cool gas clouds host growing supermassive black holes. The X-ray detection suggests a transitional phase in SMBH growth inside a gas cloud, offering a potential window into how black holes and their host galaxies form and evolve in the early universe (around 11.8–12 billion years ago).
A Japanese collaboration from Nagoya University and the SPring-8 facility has developed a high-resolution X-ray telescope with nanometer-precision, seamless nickel mirrors capable of resolving a 3.5 mm object at 1 km. Ground tests used a 10‑micrometer X-ray source about 900 meters away to simulate distant starlight, and the instrument flew on the FOXSI-4 sounding rocket in 2024 to observe a solar flare, validating its performance in space. The team plans a refined version for FOXSI-5 in 2026 and aims to miniaturize the optics for CubeSats to broaden access to high-resolution X-ray observations.
NASA’s Chandra X-ray Observatory shows that supermassive black holes grew rapidly in the early universe but have slowed dramatically over more than ten billion years, likely due to dwindling cold gas, fewer galaxy mergers, and feedback processes; the study combines multiple X-ray datasets to provide a comprehensive view of this long-term decline and its implications for how galaxies evolve.
Astronomers using the XRISM X-ray observatory have shown that the Be-star gamma-Cas is being slowly fed by a compact companion, likely a white dwarf, explaining its unusual X-ray emissions and solving a long-standing mystery about this nearby star.
XRISM data show gamma Cas’s extreme X-rays track the orbit of a magnetized white dwarf siphoning material from its Be-star companion, not the Be star itself, confirming a Be–white-dwarf binary and prompting new models of binary evolution.
AXIS (Advanced X-ray Imaging Satellite), NASA’s planned replacement for the Chandra X-ray Observatory, was halted from eligibility in NASA’s Astrophysics Probe Explorer program amid 2025 budget-related mismanagement and turmoil at Goddard Space Flight Center. Project leader Christopher Reynolds says GSFC staff losses, furloughs, and leadership upheaval compromised AXIS’s Phase A submission, while NASA maintains the cancellation followed its standard review process. The upheaval included the early retirement of key tech developer Will Zhang and a seven-week shutdown, contributing to cost/schedule delays and prompting Reynolds to blame programmatic chaos rather than the science value of AXIS.
Astronomers using China’s Einstein Probe spotted an extreme X-ray outburst (EP250702a) in a distant galaxy that models as an intermediate-mass black hole tearing apart a white dwarf, a finding supported by HKU simulations and follow-up observations. The event’s unusual timing and rapid evolution provide what researchers call the first direct evidence of this feeding process and could help uncover the long-m missing population of intermediate-mass black holes, with implications for multi-messenger astronomy.
NASA/JAXA’s XRISM X‑ray mission uses high‑resolution spectroscopy to measure gas motions around supermassive black holes, notably M87* and the Perseus cluster, unveiling the strongest turbulence seen near a black hole and the kinetic energy of surrounding gas. This helps explain how black holes heat their environments and influence galactic evolution; findings published late Jan 2026 in Nature and built on XRISM’s 2023 launch in collaboration with ESA.
Astronomers using the eROSITA X-ray instrument have mapped a hot, low-density plasma channel extending from the Local Hot Bubble toward Centaurus (and possibly toward Canis Major), a finding that supports the idea of interstellar “tunnels” linking the solar neighborhood to distant stars and suggesting a larger network of channels in the Milky Way; researchers note more data are needed to fully understand these structures.
Using XRISM's high-resolution instruments alongside ESA's XMM-Newton and NASA's NuSTAR, scientists captured unprecedented details of a supermassive black hole in galaxy MCG–6-30-15, confirming relativistic effects near the event horizon, identifying multiple wind zones, and challenging previous models of distant reflection, thus advancing our understanding of black hole physics and galaxy growth.
Scientists observed a supermassive black hole in galaxy NGC 3783 eject matter at a record-breaking speed of 60,000 km/sec, using X-ray satellites. This rapid wind formation, triggered by a burst of X-ray light, resembles solar eruptions but on a vastly larger scale, providing new insights into black hole behavior.