Results 71 to 80 of about 15,217 (172)
Modeling Nearby Low-Luminosity Active-Galactic-Nucleus Jet Images at All VLBI Scales
Galaxies, 2022 Relativistic jets from nearby low-luminosity active-galactic-nuclei (LLAGN) were observed by Very-Long Baseline Interferometry (VLBI) across many orders of magnitude in space, from milliparsec to sub-parsec scales, and from the jet base in the vicinity ...
Hung-Yi Pu +2 more
doaj +1 more source
Multiwavelength VLBI observations of Sagittarius A* [PDF]
Astronomy & Astrophysics, 2010 14pages, 14 Figures, Accepted for publication in A& ...
Lu, R. -S. +7 more
openaire +2 more sources
Evaluate the Prediction Level of Polar Motion Interpolation for 6 hr in Ideal and Real Environments
Earth and Space Science, Volume 13, Issue 1, January 2026.Abstract With the increasing demands for global development, deep space exploration missions are taking place more frequently, rendering the traditional 24‐hr Polar Motion (PM) predictions inadequate for supporting the frequent operations of spacecraft.
Wei Miao, Xueqing Xu, Yonghong Zhou
wiley +1 more source
Spectral Line VLBI Studies Using the ngEHT
Galaxies, 2023 Spectroscopy in the mm/sub-mm wavelength range is a powerful tool to study the gaseous medium in various astrophysical environments. The next generation Event Horizon Telescope (ngEHT) equipped with a wide-bandwidth backend system has great potential for
Dong-Jin Kim, Vincent Fish
doaj +1 more source
VLBI Observations of the Nucleus of Centaurus A [PDF]
Symposium - International Astronomical Union, 1982 VLBI observations of the nucleus of Centaurus A have been made at three southern hemisphere observatories. Since Centaurus A is the nearest active galaxy, VLBI investigations are important because the physical processes in the nucleus can be studied in greater linear detail than in other similar galaxies.
R. A. Preston +7 more
openaire +1 more source
Advances in Astronomy, Volume 2026, Issue 1, 2026.This paper investigates the degradation of pointing accuracy in the Kunming 40‐m radio telescope due to long‐term equipment aging and environmental disturbances. Conventional linear pointing models are constrained by their linear modeling framework, making it difficult to accurately represent the nonlinear errors induced by temperature, wind speed, and
Yao He +3 more
wiley +1 more source
Earth rotation variations observed by VLBI and the Wettzell “G” ring laser during the CONT17 campaign [PDF]
Advances in Geosciences, 2019 The VLBI (Very Long Baseline Interferometry) technique can provide the full set of parameters needed for the transformation between celestial and terrestrial reference frames with high accuracy.
S. Böhm +5 more
doaj +1 more source
A History of UNAVCO: Four Decades of Advancing Geodesy
Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.Abstract UNAVCO was a university‐governed consortium funded by the National Science Foundation (NSF), with support from the National Aeronautics and Space Administration (NASA) and the United States Geological Survey (USGS), to support geoscience research and education using geodesy.
Emily E. Zawacki +4 more
wiley +1 more source
First proof of concept of remote attendance for future observation strategies between Wettzell (Germany) and Concepción (Chile) [PDF]
, 2010 Current VLBI observations are controlled and attended locally at the radio telescopes on the basis of pre-scheduled session files. Operations have to deal with system specific station commands and individual setup procedures.
Hase, H +9 more
core
VERA’s 20 yr Evolution in Science and Technology
GalaxiesWe review the past 20 yr evolution of VERA (VLBI Exploration of Radio Astrometry) in both science and techinology. VERA is a VLBI array in Japan which consists of four 20 m-diameter telescopes, originally dedicated to phase-referencing VLBI astrometry ...
Mareki Honma +3 more
doaj +1 more source