Results 81 to 90 of about 36,409 (218)

Multifrequency Analysis of Favored Models for the Messier 87* Accretion Flow

The Astrophysical Journal
The polarized images of the supermassive black hole Messier 87* (M87*) produced by the Event Horizon Telescope (EHT) provide a direct view of the near-horizon emission from a black hole accretion and jet system.
Daniel C. M. Palumbo, Michi Bauböck, Charles F. Gammie   +2 more
doaj   +1 more source

Multiplicity of Northern bright O-type stars with optical long baseline interferometry. Results of the pilot survey. [PDF]

Proc Int Astron Union, 2023
Lanthermann C.
europepmc   +1 more source

Applications to Earth physics: Very-long-baseline interferometry and data analysis [PDF]

A range of very long baseline interferometry experiments applied to Earth physics are ...
Counselman, C. C., III, Shapiro, I. I.
core   +1 more source

Prospects for the Detection of the Sgr A* Photon Ring with Next-generation Event Horizon Telescope Polarimetry

The Astrophysical Journal Letters
The Event Horizon Telescope (EHT) has imaged two supermassive black holes, Messier 87* (M87*) and Sagittarius A* (Sgr A*), using very-long-baseline interferometry (VLBI).
Kaitlyn M. Shavelle, Daniel C. M. Palumbo   +1 more
doaj   +1 more source

Position determination of the Chang’e 3 lander with geodetic VLBI

Earth, Planets and Space, 2019
We present results from the analysis of observations of the Chang’e 3 lander using geodetic Very Long Baseline Interferometry. The applied processing strategy as well as the limiting factors to our approach is discussed.
Grzegorz Klopotek, Thomas Hobiger, Rüdiger Haas, Frédéric Jaron, Laura La Porta, Axel Nothnagel, Zhongkai Zhang, Songtao Han, Alexander Neidhardt, Christian Plötz   +9 more
doaj   +1 more source

Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources

The Astrophysical Journal Supplement Series
Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source-position uncertainties of ICRF3 by determining the excess astrometric ...
Phil Cigan, Valeri V. Makarov, Nathan J. Secrest, David Gordon, Megan C. Johnson, Sebastien Lambert   +5 more
doaj   +1 more source

The Radio Fundamental Catalog. I. Astrometry

The Astrophysical Journal Supplement Series
We present an all-sky catalog of absolute positions and estimates of correlated flux density of 21,942 compact radio sources determined from processing interferometric visibility data of virtually all very long baseline interferometry (VLBI) observing ...
L. Y. Petrov, Y. Y. Kovalev
doaj   +1 more source

Radio Astronomy with NASA’s Deep Space Network

Galaxies
The Deep Space Network (DSN) is the spacecraft tracking and communication infrastructure for NASA’s deep space missions. At three sites, approximately equally separated in (terrestrial) longitude, there are multiple radio antennas outfitted with ...
T. Joseph W. Lazio, Stephen M. Lichten
doaj   +1 more source

Principles of very-long-baseline interferometry [PDF]

The basic principles of very-long-baseline interferometry as related to its use in the determination of vector baselines, polar motion, and earth rotation are presented. Aspects relevant to geodetic applications that involve observations of extragalactic
Shapiro, I. I.
core   +1 more source

Long-Baseline Atom Interferometry

Submission to the 2026 update of the European Strategy for Particle Physics on behalf of the TVLBAI Proto-Collaboration: V2: Minor corrections to author ...
Balaz, Antun, Blas, Diego, Buchmueller, Oliver, Calatroni, Sergio, Caramete, Laurentiu-Ioan, Cerdeno, David, Chiofalo, Maria Luisa, Di Pumpo, Fabio, Djordjevic, Goran, Ellis, John, Fayet, Pierre, Foot, Chris, Gaaloul, Naceur, Gardner, Susan, Garraway, Barry M, Gauguet, Alexandre, Giese, Enno, Hogan, Jason M., Hosten, Onur, Kehagias, Alex, Kilian, Eva, Kovachy, Tim, Lacasta, Carlos, Lewicki, Marek, Asamar, Elias Lopez, Lopez-Gonzalez, J. Luis, Lundblad, Nathan, Maggiore, Michele, McCabe, Christopher, McFerran, John, Mileti, Gaetano, Millington, Peter, Morley, Gavin W., Odzak, Senad, Overstreet, Chris, Pawlowski, Krzysztof, Pelucchi, Emanuele, Rafelski, Johann, Roura, Albert, Safronova, Marianna S., Schreck, Florian, Sergijenko, Olga, Singh, Yeshpal, Soares-Santos, Marcelle, Stergioulas, Nikolaos, Tino, Guglielmo M., Tinsley, J. N., Ulbricht, Hendrik, van der Grinten, Maurits, Vaskonen, Ville, von Klitzing, Wolf, Xuereb, Andre, Cruzeiro, Emmanuel Zambrini   +52 more
openaire   +3 more sources