Results 71 to 80 of about 27,390 (189)
A wider audience: Turning VLBI into a survey instrument
, 2012 Radio observations using the Very Long Baseline Interferometry (VLBI) technique typically have fields of view of only a few arcseconds, due to the computational problems inherent in imaging larger fields.
Brisken, W. F. +4 more
core +1 more source
Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade
Radio Science, Volume 60, Issue 7, July 2025.Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park +13 more
wiley +1 more source
Masses of Nearby Supermassive Black Holes with Very-Long Baseline Interferometry
, 2011 Dynamical mass measurements to date have allowed determinations of the mass M and the distance D of a number of nearby supermassive black holes. In the case of Sgr A*, these measurements are limited by a strong correlation between the mass and distance ...
Agol +37 more
core +1 more source
Ground Based VLBI Facilities - the European and Global VLBI Network [PDF]
, 2004 11 pages, 5 figures, lecture presented at the NATA ASI VLBI School, Oct 2001. To be published in "The Role of VLBI in Astrophysics, Astrometry and Geodesy", ed. F. Mantovani.
openaire +2 more sources
Space Weather, Volume 23, Issue 7, July 2025.Abstract Global ionospheric mapping is essential for ionospheric research. However, conventional approaches often struggle to accurately capture small‐scale ionospheric variations. This study proposes a deep ensemble method based on neural networks (NNs) that generates high‐accuracy global vertical total electron content (VTEC) maps along with ...
Shuyin Mao +6 more
wiley +1 more source
The Astrophysical Journal, 2023 We present radio very long baseline interferometry (VLBI) and X-ray studies of the starburst galaxy NGC 3628. The VLBI observation at 1.5 GHz reveals seven compact (0.7−7 pc) radio sources in the central ∼250 pc region of NGC 3628.
Xiaolong Yang, Ziwei Ou
doaj +1 more source
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
Earth and Space Science, Volume 12, Issue 6, June 2025.Abstract The findings from the Second Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC) suggest that integrating effective angular momentum (EAM) is vital for enhancing the accuracy of polar motion (PM) predictions. Building on Dill et al.
Wei Miao +3 more
wiley +1 more source
SN 2007gr: a Normal Type Ic Supernova with a Mildly Relativistic Radio Jet? [PDF]
, 2010 A nearby type Ic supernova, SN 2007gr was observed with the EVN in two epochs 60 days apart (second observation also included the Green Bank Telescope).
Bourke, Stephen +11 more
core
Advanced relativistic VLBI model for geodesy
, 2016 Our present relativistic part of the geodetic VLBI model for Earthbound antennas is a consensus model which is considered as a standard for processing high-precision VLBI observations. It was created as a compromise between a variety of relativistic VLBI
Han, Wen-Biao +2 more
core +1 more source