Results 91 to 100 of about 9,054 (229)

ITA-JPN Broadband VLBI Experiment for Optical Clock Comparison [PDF]

, 2019
NICT has developed a broadband VLBI (very-long-baseline interferometry) system for intercontinental frequency transfer. After domestic tests in Japan, a 2.4 m diameter VLBI station was exported and installed at Medicina astronomy observatory of INAF in ...
Ujihara, H., Komuro, J., Pizzocaro, M., Bregolin, F., Levi, F., Cerretto, G., Mura, Alberto, Ishijima, H., Calonico, D., Ido, T., Sekido, M., Kawai, E., Cantoni, E., Nemitz, N., Okamoto, Y., Clivati, C., Tsutsumi, M., Namba, K., RICCI, ROBERTO, MACCAFERRI, GIUSEPPE, Hachisu, H., Takahashi, R., NEGUSINI, MONIA, Ichikawa, R., Takefuji, K., PERINI, FEDERICO   +25 more
core  

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

Extragalactic VLBI at 89 GHZ [PDF]

Symposium - International Astronomical Union, 1984
Radio interferometry at 89 GHz with transcontinental baselines can probe the region of active galaxies and quasars where collimation of relativistic outflows occur on length scales of 1017–18cm. Three experiments have been conducted recently to demonstrate the feasability and importance of this investigation.
openaire   +1 more source

Parallaxes and Proper Motions of Long Period Variable Stars Determined from VLBI and Gaia DR3

Galaxies
Annual 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, Tomoharu Kurayama, Hiroshi Sudou, Gabor Orosz   +3 more
doaj   +1 more source

Inter-comparison study of time and frequency transfer between VLBI and other techniques (GPS, ETS8(TCE), TW(DPN) and DMTD)

, 2011
We carried out the intercomparison ex- periments between VLBI and other techniques to show the capability of VLBI time and frequency transfer by using the current geodetic VLBI tech- nique and facilities as the summary of the exper- iments that we ...
Hama, S, Ichikawa, R, Hobiger, T, Tsuchiya, S, Takiguchi, H, Fujieda, M, Nakamura, M, Kimura, M, Nakagawa, F, Koyama, Y, Tabuchi, R, Aida, M, Amagai, J, Li, T, Ishii, A, Takahashi, Y, Kondo, T, Gotoh, T   +17 more
core  

Supernova VLBI

, 2008
We review VLBI observations of supernovae over the last quarter century and discuss the prospect of imaging future supernovae with space VLBI in the context of VSOP-2. From thousands of discovered supernovae, most of them at cosmological distances, ~50 have been detected at radio wavelengths, most of them in relatively nearby galaxies. All of the radio
openaire   +2 more sources

The first year of Antarctic VLBI observations

, 2005
P(論文)We are undertaking a series of geodetic VLBI observations between the Syowa Station 11-m antenna in Antarctica, and the 26-m antennas in Hobart Tasmania and Hartebeesthoek South Africa. These observations are the beginning of our campaign to monitor
Manabe, Seiji, Jauncey, David L., Nicolson, George D., Fukuzaki, Yoshihiro, Doi, Koichiro, Jike, Takaaki, Shibuya, Kazuo, McCulloch, Peter M.   +7 more
core   +2 more sources

VSOP Space VLBI and Geodetic VLBI Investigations of Southern Hemisphere Radio Sources

The Astrophysical Journal Supplement Series, 2002
Abstract not available.
Tingay, Steven J., Reynolds, John E., Tzioumis, Anastasios K., Jauncey, David L., Lovell, James E., Dodson, R. G., Costa, M. E., McCulloch, Peter M., Edwards, Philip G., Hirabayashi, Hisashi, Murphy, David W., Preston, Robert A., Piner, B. Glenn, Nicolson, G. D., Quick, J. F. H., Kobayashi, Hideyuki, Shibata, Kazunari M.   +16 more
openaire   +2 more sources

Inter-comparison study of time and frequency transfer between VLBI and other techniques (GPS, ETS8(TCE), TW(DPN) and DMTD)

, 2012
We carried out the intercomparison ex- periments between VLBI and other techniques to show the capability of VLBI time and frequency transfer by using the current geodetic VLBI tech- nique and facilities as the summary of the exper- iments that we ...
Hama, S, Ichikawa, R, Hobiger, T, Tsuchiya, S, Takiguchi, H, Fujieda, M, Nakamura, M, Kimura, M, Nakagawa, F, Koyama, Y, Tabuchi, R, Aida, M, Amagai, J, Li, T, Ishii, A, Takahashi, Y, Kondo, T, Gotoh, T   +17 more
core  

A VLBI receiving system for the South Pole Telescope

, 2018
The Event Horizon Telescope (EHT) is a very-long-baseline interferometry (VLBI) experiment that aims to observe supermassive black holes with an angular resolution that is comparable to the event horizon scale.
Laura Vertatschitsch, Reiland, George, Young, Andre, Evan Mayer, Antony A. Stark, Junhan Kim, Vertatschitsch, Laura, Sheperd S. Doeleman, Thomas W. Folkers, Carlstrom, John E., Kyle D. Massingill, Stark, Antony A., David Forbes, George Reiland, Jonathan Weintroub, Greer, Christopher H., Kim, Junhan, Jason SooHoo, Massingill, Kyle D., Weintroub, Jonathan, Lauria, Eugene F., Doeleman, Sheperd S., Beaudoin, Christopher, Christopher Beaudoin, Mayer, Evan, Chi H. Nguyen, Andre Young, Christopher H. Greer, Daniel P. Marrone, Eugene F. Lauria, Nguyen, Chi H., Marrone, Daniel P., Forbes, David, Folkers, Thomas W., John E. Carlstrom, SooHoo, Jason   +35 more
core   +1 more source