Results 111 to 120 of about 27,177 (193)

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

Experience from geodetic very long baseline interferometry observations at Onsala using a digital backend

Journal of Geodetic Science, 2015
The Onsala Space Observatory has installed a modern digital backend for geodetic and astronomical Very Long Baseline Interferometry (VLBI). This system consists of a Digital Base-Band Converter (DBBC) and a Mark 5B+ recorder.
Kareinen N., Haas R.
doaj   +1 more source

e-VLBI Technology in VLBI Network "Quasar" [PDF]

Proceedings of The 8th International e-VLBI Workshop — PoS(EXPReS09), 2009
Alexandre Salnikov, Andrey Finkelstein, Alexander Ipatov, Michael Kaidanovsky, Ilia Bezrukov, Andrey Mikhailov, Igor Surkis, Elena Skurikhina   +7 more
openaire   +1 more source

VLBI Activities in Japan and a Projected Space-VLBI Program [PDF]

Symposium - International Astronomical Union, 1988
There are three institutes in Japan that are equipped with VLBI facilities. Of these, Nobeyama Radio Observatory started VLBI experiments with astrophysical and astrometric interests. The Institute of Space and Astronautical Science, the Nobeyama Radio Observatory, and the Radio Research Laboratory collaborated with JPL and other institutions for this ...
openaire   +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

A pilot very long baseline interferometry study of the SQUAB quasar sample featuring multiple Gaia detections

Astronomy & Astrophysics
Context. Our previous work identified a class of SDSS quasars with multiple Gaia detections, classifying them as candidates for various astrophysical systems, such as quasar–star pairs, dual quasars, and gravitationally lensed quasars.
Zhang Y., An T., Ji X., Zheng Z., Liu Y., Wu Q., Lin R., Liao S.   +7 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

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

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

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