Results 1 to 10 of about 4,319,648 (210)
The Host Galaxy Fluxes of Active Galaxy Nuclei Are Generally Overestimated by the Flux Variation Gradient Method [PDF]
UniverseIn terms of the variable nature of normal active galaxy nuclei (AGN) and luminous quasars, a so-called flux variation gradient (FVG) method has been widely utilized to estimate the underlying non-variable host galaxy fluxes.
Minxuan Cai +4 more
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Applied Sciences, 2021 Due to the space and time constraints of turbulence measurement equipment and the experiment scene, it is difficult to obtain the atmosphere refractive index structure constant over the ocean.
Manman Xu +5 more
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Meteor Radar for Investigation of the MLT Region: A Review
AtmosphereThis is an introductory review of modern meteor radar and its application to the measurement of the dynamical parameters of the Mesosphere Lower Thermosphere (MLT) Region within the altitude range of around 70 to 110 km, which is where most meteors are ...
Iain M. Reid
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Bayesian parameter estimation using conditional variational autoencoders for gravitational-wave astronomy [PDF]
Nature Physics, 2021 Gravitational wave (GW) detection is now commonplace and as the sensitivity of the global network of GW detectors improves, we will observe $\mathcal{O}(100)$s of transient GW events per year. The current methods used to estimate their source parameters employ optimally sensitive but computationally costly Bayesian inference approaches where typical ...
Gabbard, Hunter +4 more
openaire +3 more sources
Photon ring test of the Kerr hypothesis: Variation in the ring shape [PDF]
Astronomy & Astrophysics, 2022 The Event Horizon Telescope (EHT) collaboration recently released horizon-scale images of the supermassive black hole M87*. These images are consistently described by an optically thin, lensed accretion flow in the Kerr spacetime. General relativity (GR)
H. Paugnat +3 more
semanticscholar +1 more source
Weighted Anisotropic–Isotropic Total Variation for Poisson Denoising [PDF]
International Conference on Information Photonics, 2023 Poisson noise commonly occurs in images captured by photon-limited imaging systems such as in astronomy and medicine. As the distribution of Poisson noise depends on the pixel intensity value, noise levels vary from pixels to pixels.
Kevin Bui +3 more
semanticscholar +1 more source
Physical Review Physics Education ResearchWe investigate the multilingual and multimodal performance of a large language model-based artificial intelligence (AI) system, GPT-4o, using a diverse set of physics concept inventories spanning multiple languages and subject categories. The inventories,
Gerd Kortemeyer +4 more
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Follow-up timing of 24 pulsars discovered in commensal radio astronomy FAST survey
Monthly notices of the Royal Astronomical Society, 2023 The follow-up timing observations were carried out for 24 pulsars discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST Survey (CRAFTS).
Q. Wu +38 more
semanticscholar +1 more source
Re-detection and a possible time variation of soft X-ray polarization from the Crab [PDF]
Nature Astronomy, 2020 The Crab nebula is so far the only celestial object with a statistically significant detection in soft X-ray polarimetry1–4, a window that has not been explored in astronomy since the 1970s.
H. Feng +26 more
semanticscholar +1 more source
Revisiting the Transit Timing and Atmosphere Characterization of the Neptune-mass Planet HAT-P-26 b
The Astronomical Journal, 2023 We present a transit-timing variation (TTV) and planetary atmosphere analysis of the Neptune-mass planet HAT-P-26 b. We present a new set of 13 transit light curves from optical ground-based observations and combine them with light curves from the Wide ...
Napaporn A-thano +13 more
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