Results 91 to 100 of about 27,737 (204)
Approaching the event horizon: 1.3mm VLBI of SgrA*
, 2008 Advances in VLBI instrumentation now allow wideband recording that significantly increases the sensitivity of short wavelength VLBI observations. Observations of the super-massive black hole candidate at the center of the Milky Way, SgrA*, with short ...
Bower G C +9 more
core +1 more source
The Structure and Propagation of the Misaligned Jet M87
Galaxies, 2016 Due to its proximity, M87 is a prime target for next-generation high-resolution VLBI at short millimeter wavelengths, by which the jet launching region and the black hole shadow are expected to be resolved and imaged sometime soon.
Kazuhiro Hada
doaj +1 more source
Journal of Geophysical Research: Solid Earth, Volume 129, Issue 12, December 2024.Abstract We describe the development and assessment of a new terrestrial reference frame (TRF) based on a combination of geodetic techniques at the observation level over the period 2010–2022. Included in the solution are observations from the Global Positioning System (GPS), Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI). A
B. Haines +11 more
wiley +1 more source
The Gould's Belt distance survey [PDF]
, 2011 Very Long Baseline Interferometry (VLBI) observations can provide the position of compact radio sources with an accuracy of order 50 micro-arcseconds. This is sufficient to measure the trigonometric parallax and proper motions of any object within 500 pc
Boden, A. F. +5 more
core +2 more sources
Climatic signals observed by VLBI
Acta Geodaetica et Geophysica Hungarica, 2006 VLBI observations at various stations all over the globe have been carried out since the beginning of the eighties. As VLBI allows to determine tropospheric parameters such as hydrostatic and wet zenith path delays stable and long time series of these parameters exist that can be used for climatological studies.
Schuh, H. +3 more
openaire +4 more sources
Single-band VLBI Absolute Astrometry
The Astronomical Journal, 2023 Abstract The ionospheric path delay impacts single-band, very long baseline interferometry (VLBI) group delays, which limits their applicability for absolute astrometry. I consider two important cases: when observations are made simultaneously in two bands, but delays in only one band are available for a subset of observations; and when ...
openaire +3 more sources
VLBI observations of SN2011dh: imaging of the youngest radio supernova
, 2011 We report on the VLBI detection of supernova SN2011dh at 22GHz using a subset of the EVN array. The observations took place 14 days after the discovery of the supernova, thus resulting in a VLBI image of the youngest radio-loud supernova ever. We provide
A. Alberdi +27 more
core +1 more source
Parallaxes and Proper Motions of Long Period Variable Stars Determined from VLBI and Gaia DR3
GalaxiesAnnual parallaxes of Galactic long period variable stars (LPVs) are essential for determining their distances and intrinsic properties, but their measurement remains challenging because of their large stellar sizes, circumstellar matter, and time ...
Akiharu Nakagawa +3 more
doaj +1 more source
Navigational utility of high-precision radio interferometer for Galileo's approach to Jupiter [PDF]
The effect of very long baseline interferometry (VLBI) measurements of 2-nanoradian (nrad) accuracy has been studied for use in Galileo's approach to Jupiter's moon Io.
Folkner, W. M.
core +1 more source
, 2003 Latex, 6 pages, 8 figures; Invited Review Talk at the ``ADeLA2002 - Astrometry in Latin America'' Conference, Araraquara - Sao Paulo, 2 - 5 September 2002, to be published in ADeLA Publications Series, Vol.
openaire +2 more sources