Results 21 to 30 of about 56,169 (259)

Very Long Baseline Interferometry with the SKA [PDF]

Proceedings of Advancing Astrophysics with the Square Kilometre Array — PoS(AASKA14), 2015
Adding VLBI capability to the SKA arrays will greatly broaden the science of the SKA, and is feasible within the current specifications. SKA-VLBI can be initially implemented by providing phased-array outputs for SKA1-MID and SKA1-SUR and using these extremely sensitive stations with other radio telescopes, and in SKA2 by realising a distributed ...
Paragi, Zsolt,, Godfrey, Leith,, Reynolds, Cormac,, Rioja, Maria,, Deller, Adam,, Zhang, Bo,, Gurvits, Leonid,, Bietenholz, Michael,, Szomoru, Arpad,, Bignall, Hayley,, Boven, Paul,, Charlot, P., Dodson, Richard,, Frey, Sandor,, Garrett, Michael,, Imai, Hiroshi,, Lobanov, Andrei,, Reid, Mark,, Ros, Eduardo,, van Langevelde, Huib,, Zensus, J. Anton, Zheng, Xing Wu,, Alberdi, Antxon,, Agudo, Ivan,, An, Tao,, Argo, Megan,, Beswick, Rob,, Biggs, Andy D.,, Brunthaler, Andreas,, Campbell, Robert M.,, Cimo, Giuseppe,, Colomer, Francisco,, Corbel, Stephane,, Conway, John,, Cseh, David,, Deane, Roger,, Falcke, Heino,, Gabanyi, Krisztina,, Gawronski, Marcin,, Gaylard, Michael,, Giovannini, Gabriele,, Giroletti, Marcello,, Goddi, Ciriaco,, Goedhart, Sharmila,, Gomez, Jose L.,, Gunn, Alastair,, Jung, Taehyun,, Kharb, Preeti,, Klockner, Hans-Rainer,, Kording, Elmar,, Kovalev, Yurii Yu.,, Kunert-Bajraszewska, Magdalena,, Lindqvist, Michael,, Lister, Matt,, Mantovani, Franco,, Marti-Vidal, Ivan,, Mezcua, Mar,, Mckean, John,, Middelberg, Enno,, Miller-Jones, James,, Moldon, Javier,, Muxlow, Tom,, O'Brien, Tim,, Pérez-Torres, Miguel,, Pogrebenko, Sergei,, Quick, Jonathan,, Rushton, Anthony P.,, Schilizzi, Richard,, Smirnov, Oleg,, Sohn, Bong Won,, Surcis, Gabriele,, Taylor, Greg,, Tingay, Steven,, Tudose, Valeriu,, van Der Horst, Alexander,, van Leeuwen, Joeri,, Venturi, Tiziana,, Vermeulen, Rene,, Vlemmings, Wouter,, de Witt, Aletha,, Wucknitz, Olaf,, Yang, Jun,   +81 more
  +16 more sources

High-sensitivity Beamformed Observations of the Crab Pulsar's Radio Emission

The Astrophysical Journal, 2023
We analyzed four epochs of beamformed European VLBI Network data of the Crab Pulsar at 1658.49 MHz. With the high sensitivity resulting from resolving out the Crab Nebula, we are able to detect even the faint high-frequency components in the folded ...
Rebecca Lin, Marten H. van Kerkwijk
doaj   +1 more source

Very Long Baseline Interferometry [PDF]

Highlights of Astronomy, 1989
The technique of very long baseline interferometry (VLBI) has undergone two decades of steady growth and refinement since its inception in 1967. In the beginning, only crude measurements of visibility on single baselines were possible. Now 18-station arrays have been used to produce images with dynamic ranges exceeding 2000:1; relative motions of ...
openaire   +2 more sources

Observational Evidence of a Centi-parsec Supermassive Black Hole Binary Existing in the Nearby Galaxy M81

The Astrophysical Journal, 2023
Studying a centi-parsec supermassive black hole binary (SMBHB) would allow us to explore a new parameter space in active galactic nuclei, and these objects are also potential sources of gravitational waves.
Wu Jiang, Zhiqiang Shen, Ivan Martí-Vidal, Zhen Yan, Lei Huang, Roman Gold, Ya-Ping Li, Fuguo Xie, Noriyuki Kawaguchi   +8 more
doaj   +1 more source

A New Very Long Baseline Interferometry Method Based on the Uplink Signal

IEEE Access, 2020
Very long baseline interferometry (VLBI) is widely used for astronomical observations and navigation of deep space receivers. To solve the problems of the downlink signal being excessively weak to be received and the excessively large acquisition time, a
Linshan Xue, Weiren Wu, Xue Li
doaj   +1 more source

Selective Dynamical Imaging of Interferometric Data

The Astrophysical Journal Letters, 2022
Recent developments in very long baseline interferometry (VLBI) have made it possible for the Event Horizon Telescope (EHT) to resolve the innermost accretion flows of the largest supermassive black holes on the sky.
Joseph Farah, Peter Galison, Kazunori Akiyama, Katherine L. Bouman, Geoffrey C. Bower, Andrew Chael, Antonio Fuentes, José L. Gómez, Mareki Honma, Michael D. Johnson, Yutaro Kofuji, Daniel P. Marrone, Kotaro Moriyama, Ramesh Narayan, Dominic W. Pesce, Paul Tiede, Maciek Wielgus, Guang-Yao Zhao, The Event Horizon Telescope Collaboration, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Keiichi Asada, Rebecca Azulay, Anne-Kathrin Baczko, David Ball, Mislav Baloković, John Barrett, Bradford A. Benson, Dan Bintley, Lindy Blackburn, Raymond Blundell, Wilfred Boland, Hope Boyce, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Avery E. Broderick, Dominique Broguiere, Thomas Bronzwaer, Sandra Bustamente, Do-Young Byun, John E. Carlstrom, Chi-kwan Chan, Koushik Chatterjee, Shami Chatterjee, Ming-Tang Chen, Yongjun Chen, Ilje Cho, Pierre Christian, John E. Conway, James M. Cordes, Thomas M. Crawford, Geoffrey B. Crew, Alejandro Cruz-Osorio, Yuzhu Cui, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Sheperd S. Doeleman, Ralph P. Eatough, Heino Falcke, Vincent L. Fish, Ed Fomalont, H. Alyson Ford, Raquel Fraga-Encinas, Per Friberg, Christian M. Fromm, Charles F. Gammie, Roberto Garc’a, Olivier Gentaz, Ciriaco Goddi, Roman Gold, Arturo I. Gómez-Ruiz, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Daryl Haggard, Michael H. Hecht, Ronald Hesper, Luis C. Ho, Paul Ho, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, Makoto Inoue, Sara Issaoun, David J. James, Buell T. Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Svetlana Jorstad, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K. Keating, Mark Kettenis, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kim, Motoki Kino, Jun Yi Koay, Patrick M. Koch, Shoko Koyama, Carsten Kramer, Michael Kramer, Thomas P. Krichbaum, Cheng-Yu Kuo, Tod R. Lauer, Sang-Sung Lee, Aviad Levis, Yan-Rong Li, Zhiyuan Li, Rocco Lico, Greg Lindahl, Michael Lindqvist, Jun Liu, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin Lonsdale, Ru-Sen Lu, Nicholas R. MacDonald, Jirong Mao, Nicola Marchili, Sera Markoff, Alan P. Marscher, Iván Martí-Vidal, Satoki Matsushita, Lynn D. Matthews, Lia Medeiros, Karl M. Menten, Izumi Mizuno, Yosuke Mizuno, James M. Moran, Monika Moscibrodzka, Cornelia Müller, Alejandro Mus Mejas, Gibwa Musoke, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, Joey Neilsen, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Michael A. Nowak, Hiroki Okino, Héctor Olivares, Gisela N. Ortiz-León, Tomoaki Oyama, Feryal zel, Daniel C. M. Palumbo, Jongho Park, Nimesh Patel, Ue-Li Pen, Vincent Piétu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Felix M. Pötzl, Ben Prather, Jorge A. Preciado-López, Dimitrios Psaltis, Hung-Yi Pu, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Chet Ruszczyk, Kazi L. J. Rygl, Salvador Sánchez, David Sánchez-Arguelles, Mahito Sasada, Tuomas Savolainen, F. Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, He Sun, Fumie Tazaki, Alexandra J. Tetarenko, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Efthalia Traianou, Tyler Trent, Sascha Trippe, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jan Wagner, Derek Ward-Thompson, John Wardle, Jonathan Weintroub, Norbert Wex, Robert Wharton, Kaj Wiik, George N. Wong, Qingwen Wu, Doosoo Yoon, André Young, Ken Young, Ziri Younsi, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Shan-Shan Zhao   +234 more
doaj   +1 more source

Common-clock very long baseline interferometry using a coherent optical fiber link

Optica, 2020
Among the most powerful techniques for the exploration of the Universe is very long baseline interferometry (VLBI), which is based on the simultaneous observation of radio sources in the sky with arrays of distant ground-based antennas.
C. Clivati, R. Aiello, G. Bianco, C. Bortolotti, P. De Natale, V. Di Sarno, P. Maddaloni, G. Maccaferri, A. Mura, M. Negusini, F. Levi, F. Perini, R. Ricci, M. Roma, L. Santamaria Amato, M. Siciliani de Cumis, M. Stagni, A. Tuozzi, D. Calonico   +18 more
semanticscholar   +1 more source

Inverse MultiView. II. Microarcsecond Trigonometric Parallaxes for Southern Hemisphere 6.7 GHz Methanol Masers G232.62+00.99 and G323.74–00.26

The Astrophysical Journal, 2023
We present the first results from the Southern Hemisphere Parallax Interferometric Radio Astrometry Legacy Survey: 10 μ as accurate parallaxes and proper motions for two Southern Hemisphere 6.7 GHz methanol masers obtained using the inverse MultiView ...
L. J. Hyland, M. J. Reid, G. Orosz, S. P. Ellingsen, S. D. Weston, J. Kumar, R. Dodson, M. J. Rioja, W. J. Hankey, P. M. Yates-Jones, T. Natusch, S. Gulyaev, K. M. Menten, A. Brunthaler   +13 more
doaj   +1 more source

A coherent fiber link for very long baseline interferometry [PDF]

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2015
We realize a coherent fiber link for application in very long baseline interferometry (VLBI) for radio astronomy and geodesy. A 550-km optical fiber connects the Italian National Metrological Institute (INRIM) to a radio telescope in Italy and is used for the primary Cs fountain clock stability and accuracy dissemination.
C. Clivati, G. Costanzo, M. Frittelli, F. Levi, A. Mura, M. Zucco, R. Ambrosini, C. Bortolotti, F. Perini, M. Roma, D. Calonico   +10 more
semanticscholar   +5 more sources

Single-band VLBI Absolute Astrometry

The Astronomical Journal, 2023
The ionospheric path delay impacts single-band, very long baseline interferometry (VLBI) group delays, which limits their applicability for absolute astrometry.
Leonid Petrov
doaj   +1 more source