Results 1 to 10 of about 4,077,627 (323)

Bayesian parameter estimation using conditional variational autoencoders for gravitational-wave astronomy [PDF]

open access: closedNature 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 ...
Hunter Gabbard   +4 more
openalex   +4 more sources

Report of combined meeting of Commissions 8 (Meridian Astronomy), 19 (Variation Of Latitude) and 31 (Time), August 21. 9.30 a.m [PDF]

open access: bronzeTransactions of the International Astronomical Union, 1950
The President outlined the history of the Ross photographic zenith tube, saying that it was originally designed for measurement of the variation of latitude by Dr Ross, and later adapted to the determination of time by Dr Littel. The success of the instrument and its possible application to various problems in positional astronomy made it of interest ...
Harold Spencer Jones
openalex   +2 more sources

Astronomy and Climate-Earth System: Can Magma Motion under Sun-Moon Gravitation Contribute to Paleoclimatic Variations and Earth’s Heat? [PDF]

open access: goldAdvances in Astronomy, 2015
Paleoclimate data have yielded variations with periods of ~23, ~40, and ~100 ky. Thermodynamic changes resulting from orbital eccentricity, obliquity, and precession have been ascribed as the cause of the variations although processes within the oceans and atmosphere may have too short memory to explain such variations.
Zhiren Joseph Wang, Xiaopei Lin
openalex   +5 more sources

The Host Galaxy Fluxes of Active Galaxy Nuclei Are Generally Overestimated by the Flux Variation Gradient Method [PDF]

open access: yesUniverse
In 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
doaj   +2 more sources

Atmospheric Optical Turbulence Characteristics over the Ocean Relevant to Astronomy and Atmospheric Physics

open access: yesApplied 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
doaj   +2 more sources

“Frog-eyes” in astronomy: Monitoring binary radial velocity variations through a pair of narrow-band filters

open access: closedScience China Physics, Mechanics & Astronomy
Spectroscopic observations are a crucial step in driving major discoveries in the era of time-domain surveys. However, the pace of current spectroscopic surveys is increasingly unable to meet the demands of rapidly advancing large-scale time-domain surveys.
Chuanjie Zheng   +15 more
openalex   +3 more sources

The Orbit and Dynamical Mass of Polaris: Observations with the CHARA Array [PDF]

open access: yesThe Astrophysical Journal
The 30 yr orbit of the Cepheid Polaris has been followed with observations by the Center for High Angular Resolution Astronomy (CHARA) Array from 2016 through 2021.
Nancy Remage Evans   +21 more
doaj   +2 more sources

A Review of the Characteristics of Light Pollution: Assessment Technique, Policy, and Legislation

open access: yesEnergies
Light pollution from the use of artificial lighting poses significant impacts on human health, traffic safety, ecological environment, astronomy, and energy use.
Ying Hao   +4 more
doaj   +2 more sources

Meteor Radar for Investigation of the MLT Region: A Review

open access: yesAtmosphere
This 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
doaj   +2 more sources

Photon ring test of the Kerr hypothesis: Variation in the ring shape [PDF]

open access: yesAstronomy & 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)
Hadrien Paugnat   +3 more
semanticscholar   +1 more source

Home - About - Disclaimer - Privacy