Results 61 to 70 of about 5,584 (162)
EIGER. III. JWST/NIRCam Observations of the Ultraluminous High-redshift Quasar J0100+2802
The Astrophysical Journal, 2023 We present the first rest-frame optical spectrum of a high-redshift quasar observed with JWST/NIRCam in Wide Field Slitless mode. The observed quasar, J0100+2802, is the most luminous quasar known at z > 6. We measure the mass of the central supermassive
Anna-Christina Eilers +8 more
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Science, 1986 In the quarter century since the first optical identification of a "radio star" (3C 48), astronomers have come to general agreement that the underlying quasar energy source is accretion onto a massive black hole. There is much less agreement on the detailed physics of the processes by which this energy is converted to the forms observed, but this has ...
Trimble, Virginia, Woltjer, Lodewijk
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SARS‐CoV‐2 Chronic Intervillositis: Variations of Maternal Antiviral Response
American Journal of Reproductive Immunology, Volume 95, Issue 2, February 2026.ABSTRACT Problem Placental compromise is a determining factor in the outcome of pregnancies complicated by maternal SARS‐CoV‐2 infection. Chronic histiocytic intervillositis (CHI) is the initial response to SARS‐CoV‐2 infection, but the underlying mechanisms are poorly understood.
Daria Kozlova +8 more
wiley +1 more source
Journal of Applied Clinical Medical Physics, Volume 27, Issue 1, January 2026.Abstract Background HyperSight CBCT offers rapid image acquisition and enhanced image quality, supporting its integration into online adaptive radiotherapy (OART). However, its performance under respiratory‐induced tumor motion requires further evaluation.
Yi‐Fang Wang +3 more
wiley +1 more source
Journal of Applied Clinical Medical Physics, Volume 27, Issue 1, January 2026.Abstract Background Respiratory‐induced tumor motion remains a significant challenge in carbon‐ion radiotherapy (CIRT), potentially compromising dose accuracy and escalating dose in nearby organs. Although belt‐based sensors are commonly used for gating, issues related to setup reproducibility and patient comfort increased the demand for laser‐based ...
Tae‐Ho Kim +9 more
wiley +1 more source
Journal of Applied Clinical Medical Physics, Volume 27, Issue 1, January 2026.Abstract Purpose To investigate the effects of targeted modifications to a clinical 4D‐MR pulse sequence on displacement accuracy for abdominal tumor motion tracking, and to compare its performance with established 4D‐MR and 4D‐CT protocols using a motion phantom driven by clinically representative respiratory waveforms.
Morgan Aire +4 more
wiley +1 more source
The Astrophysical JournalQuasars could serve as standard candles if the relation between their ultraviolet (UV) and X-ray luminosities can be accurately calibrated. Previously, we developed a model-independent method to calibrate quasar standard candles using the distance ...
Xiaolei Li +2 more
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Surveying the Onset and Evolution of Supermassive Black Holes at High-z with AXIS
UniverseThe nature and origin of supermassive black holes (SMBHs) remain an open matter of debate within the scientific community. While various theoretical scenarios have been proposed, each with specific observational signatures, the lack of sufficiently ...
Nico Cappelluti +9 more
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Nature Astronomy, 2018 For consistency with Nature policy, the version posted here is the text as submitted to Nature Astronomy in November 2017. The final version is available at the DOI below, and differs slightly in wording.
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Modeling quasar variability through self-organizing map-based neural process [PDF]
Serbian Astronomical JournalConditional Neural Process (QNPy) has shown to be a good tool for modeling quasar light curves. However, given the complex nature of the source and hence the data represented by light curves, processing could be time-consuming.
Čvorović-Hajdinjak I.
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