Results 1 to 10 of about 4,118,813 (333)
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 +4 more sources
Astronomy and Climate-Earth System: Can Magma Motion under Sun-Moon Gravitation Contribute to Paleoclimatic Variations and Earth’s Heat? [PDF]
Advances 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 Wang, Xiaopei Lin
openaire +5 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]
Transactions 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
openaire +2 more sources
Variation of the fine-structure constant: an update of statistical analyses with recent data [PDF]
Astronomy & Astrophysics, Volume 557, id.A36, 9 pp., September
2013, 2013 We analyze the consistency of different astronomical data of the variation in the fine-structure constant obtained with KECK and VLT. We tested the consistency using the Student test and confidence intervals. We splited the data sets in to smaller intervals and grouped them acording to redshift and angular position.
Kraiselburd, Lucila +2 more
arxiv +7 more sources
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
doaj +2 more sources
The stability of the optical flux variation gradient for 3C120 [PDF]
A&A 581, A93 (2015), 2015 New $B$- and $V$-band monitoring in 2014 $-$ 2015 reveals that the Seyfert 1 Galaxy, 3C120, has brightened by a magnitude of $1.4$, compared to our campaign that took place in 2009 $-$ 2010. This allowed us to check for the debated luminosity and time-dependent color variations claimed for SDSS quasars.
Chini, Rolf +4 more
arxiv +3 more sources
On Measuring the Variation of High Energy Cut-off in Active Galactic Nuclei [PDF]
Astrophysical Journal, 2018 The variation in the high energy cut-off E_c in active galactic nuclei uniquely probes the corona physics. In this work we show that the ratio of two NuSTAR spectra (in analogy to difference imaging technique widely used in astronomy) is uniquely useful in studying E_c variations.
Jixie Zhang, Junxian Wang, Fei-Fan Zhu
arxiv +3 more sources
Inelastic O+H collisions and the OI 777nm solar centre-to-limb variation [PDF]
Astronomy & Astrophysics, 2018 The OI 777 nm triplet is a key diagnostic of oxygen abundances in the atmospheres of FGK-type stars; however it is sensitive to departures from local thermodynamic equilibrium (LTE).
Amarsi, A. M. +4 more
core +2 more sources
Detection of an exoplanet around the evolved K giant HD 66141 [PDF]
, 2012 Aims. We have been carrying out a precise radial velocity (RV) survey for K giants to search for and study the origin of the lowamplitude and long-periodic RV variations. Methods. We present high-resolution RV measurements of the K2 giant HD 66141 from December 2003 to January 2011 using the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES)
Han, I. +4 more
arxiv +3 more sources
A Review of the Characteristics of Light Pollution: Assessment Technique, Policy, and Legislation
EnergiesLight 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