Results 111 to 120 of about 27,737 (204)

Monitoring of multi-frequency polarization of gamma-ray bright AGNs

EPJ Web of Conferences, 2013
We started two observing programs with the Korean VLBI Network (KVN) monitoring changes in the flux density and polarization of relativistic jets in gamma-ray bright AGNs simultaneously at 22, 43, 86, 129 GHz.
Lee Sang-Sung, Han Myounghee, Kang Sincheol, Seen Jungmin, Byun Do-Young, Baek Jun-Hyun, Kim Soon-Wook, Kim Jeong-Sook   +7 more
doaj   +1 more source

Use of a digital tone extractor for real-time phase analysis [PDF]

A digital tone extractor which monitors the phase integrity of a VLBI recording system in real time was developed. The digital tone extractor monitors phase calibrator tones injected at the antenna and tracks their phase as a function of time.
Parks, G. S., Sigman, E.
core   +1 more source

Automated Modeling with AAP-Imfit: Astrometry and Photometry via CASA

The Astrophysical Journal
Very long baseline interferometry (VLBI) provides the highest-resolution radio intensity maps, crucial for detailed studies of compact sources like active galactic nuclei (AGNs) and their relativistic jets.
Alfredo Amador-Portes, Eva Palafox, Víctor M. Patiño-Álvarez, Vahram Chavushyan, Andrei P. Lobanov, Sergio A. Dzib   +5 more
doaj   +1 more source

On the Integration of VLBI Observations to GENESIS into Global VGOS Operations

Remote Sensing
The upcoming European Space Agency (ESA) satellite mission GENESIS is an Earth-orbiting satellite carrying instruments of all four space geodetic techniques.
David Schunck, Lucia McCallum, Guifré Molera Calvés   +2 more
doaj   +1 more source

VLBI analyses with the GINS software for multi-technique combination at the observation level

, 2007
A rigorous approach to simultaneously determine a Terrestrial Reference Frame (TRF) and Earth Orientation Parameters (EOP) is now currently applied on a routine basis in a coordinated project within the Groupe de Recherches de G\'eod\'esie Spatiale (GRGS)
Biancale, R., Bourda, G., Charlot, P.
core   +1 more source

Towards millimeter VLBI

, 2008
We discuss the present performance and the future perspectives of VLBI in the 3 mm to 0.85 mm observing bands (so called mm-VLBI). The availability of new telescopes and the recent technical development towards larger observing bandwidth and higher data-rates now allow to image with 3mm-VLBI hundreds of sources with high dynamic range. As an example we
Krichbaum, T. P., Bach, U., Graham, D. A., Alef, W., Roy, A., Witzel, A., Zensus, J. A., Bremer, M., Sanchez, S.   +8 more
openaire   +2 more sources

Estimation of Earth Rotation Parameters Based on BDS-3 and Discontinuous VLBI Observations

Remote Sensing
Earth rotation parameters (ERPs) are fundamental to geodetic and astronomical studies. With its high measurement accuracy and stability, the Very Long Baseline Interferometry (VLBI) plays an irreplaceable role in estimating the ERPs and maintaining the ...
Chenxiang Wang, Jizhang Sang, Xingxing Li, Pengfei Zhang   +3 more
doaj   +1 more source

The Parsec-Scale Structure of the Newer TeV Blazars

EPJ Web of Conferences, 2013
We expand our previous studies of the parsec-scale structure of TeV blazars by presenting firstepoch images from VLBA monitoring of ten newer TeV HBLs. All ten sources were successfully detected and imaged, and all showed a one-sided core-jet structure ...
Glenn Piner B., Edwards Philip G.
doaj   +1 more source

Sphero-Conical Modeling for the Estimation of Very Long Baseline Interferometry Invariant Point. [PDF]

Sensors (Basel), 2022
Bae TS, Hong CK.
europepmc   +1 more source

Viscoelastic deformation near active plate boundaries [PDF]

Very Long Baseline Interferometry (VLBI) now has the capacity to monitor geodetic positions with precisions of a few 1 mm over continental baselines. For tectonic applications, one of the major products of the VLBI program is the determination of the ...
Ward, Steven N.
core   +1 more source