Results 31 to 40 of about 56,169 (259)

Bayesian self-calibration and imaging in very long baseline interferometry [PDF]

Astronomy & Astrophysics
Self-calibration methods with the CLEAN algorithm have been widely employed in very long baseline interferometry (VLBI) data processing in order to correct antenna-based amplitude and phase corruptions present in the data.
Jongsoo Kim, A. S. Nikonov, J. Roth, Torsten A. Enßlin, M. Janssen, Philipp Arras, Hendrik Mueller, A. Lobanov   +7 more
semanticscholar   +1 more source

Jet kinematics of the quasar 4C+21.35 from observations with the KaVA very long baseline interferometry array [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We present the jet kinematics of the flat spectrum radio quasar (FSRQ) 4C+21.35 using time-resolved KaVA very long baseline interferometry array radio maps obtained from 2014 September to 2016 July.
Taeseok Lee, S. Trippe, M. Kino, B. Sohn, Jongho Park, Junghwan Oh, K. Hada, K. Niinuma, H. Ro, T. Jung, Guangyao Zhao, Sang-Sung Lee, J. Algaba, K. Akiyama, K. Wajima, S. Sawada-Satoh, F. Tazaki, I. Cho, J. Hodgson, J. Lee, Y. Hagiwara, M. Honma, S. Koyama, T. An, Yuzhu Cui, H. Yoo, N. Kawaguchi, D. Roh, Se-jin Oh, J. Yeom, Dong-Kyu Jung, C. Oh, Hyo-Ryoung Kim, Ju-Yeon Hwang, D. Byun, Se-Hyung Cho, Hyun-Goo Kim, H. Kobayashi, K. Shibata, Zhiqiang Shen, Wu Jiang, J. Lee   +41 more
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Three-dimensional Orbit of AC Her Determined: Binary-induced Truncation Cannot Explain the Large Cavity in This Post-AGB Transition Disk

The Astrophysical Journal, 2023
Some evolved binaries, namely post–asymptotic giant branch (AGB) binaries, are surrounded by stable and massive circumbinary disks similar to protoplanetary disks found around young stars. Around 10% of these disks are transition disks: they have a large
Narsireddy Anugu, Jacques Kluska, Tyler Gardner, John D. Monnier, Hans Van Winckel, Gail H. Schaefer, Stefan Kraus, Jean-Baptiste Le Bouquin, Steve Ertel, Antoine Mérand, Robert Klement, Claire L Davies, Jacob Ennis, Aaron Labdon, Cyprien Lanthermann, Benjamin R. Setterholm, Theo ten Brummelaar, Akke Corporaal, Laurence Sabin, Jayadev Rajagopal   +19 more
doaj   +1 more source

Horizonless Spacetimes As Seen by Present and Next-generation Event Horizon Telescope Arrays

The Astrophysical Journal, 2023
We study the capabilities of present and future radio very long baseline interferometry arrays to distinguish black holes from horizonless spacetimes. We consider an example of a horizonless spacetime, obtained by overspinning a regular black hole.
Astrid Eichhorn, Roman Gold, Aaron Held
doaj   +1 more source

Key Science Goals for the Next-Generation Event Horizon Telescope

Galaxies, 2023
The Event Horizon Telescope (EHT) has led to the first images of a supermassive black hole, revealing the central compact objects in the elliptical galaxy M87 and the Milky Way.
Michael D. Johnson, Kazunori Akiyama, Lindy Blackburn, Katherine L. Bouman, Avery E. Broderick, Vitor Cardoso, Rob P. Fender, Christian M. Fromm, Peter Galison, José L. Gómez, Daryl Haggard, Matthew L. Lister, Andrei P. Lobanov, Sera Markoff, Ramesh Narayan, Priyamvada Natarajan, Tiffany Nichols, Dominic W. Pesce, Ziri Younsi, Andrew Chael, Koushik Chatterjee, Ryan Chaves, Juliusz Doboszewski, Richard Dodson, Sheperd S. Doeleman, Jamee Elder, Garret Fitzpatrick, Kari Haworth, Janice Houston, Sara Issaoun, Yuri Y. Kovalev, Aviad Levis, Rocco Lico, Alexandru Marcoci, Niels C. M. Martens, Neil M. Nagar, Aaron Oppenheimer, Daniel C. M. Palumbo, Angelo Ricarte, María  J. Rioja, Freek Roelofs, Ann C. Thresher, Paul Tiede, Jonathan Weintroub, Maciek Wielgus   +44 more
doaj   +1 more source

Very long baseline interferometry observation of the triple AGN candidate J0849+1114 [PDF]

Astronomy & Astrophysics, 2019
Context. In the hierarchical structure formation model, galaxies grow through various merging events. Numerical simulations indicate that mergers can enhance the activity of central supermassive black holes in galaxies. Aims.
K. Gab'anyi, S. Frey, S. Satyapal, A. Constantin, R. Pfeifle   +4 more
semanticscholar   +1 more source

A balloon-borne very long baseline interferometry experiment in the stratosphere: Systems design and developments [PDF]

Advances in Space Research, 2018
The balloon-borne very long baseline interferometry (VLBI) experiment is a technical feasibility study for performing radio interferometry in the stratosphere. The flight model has been developed.
A. Doi, Y. Kono, K. Kimura, S. Nakahara, T. Oyama, N. Okada, Y. Satou, K. Yamashita, N. Matsumoto, Mitsuhisa Baba, D. Yasuda, Shunsaku Suzuki, Yutaka Hasegawa, M. Honma, Hiroaki Tanaka, K. Ishimura, Y. Murata, R. Shimomukai, T. Tachi, Kazuya Saito, N. Watanabe, N. Bando, O. Kameya, Y. Yonekura, M. Sekido, Y. Inoue, H. Sakamoto, N. Kogiso, Y. Shoji, H. Ogawa, K. Fujisawa, M. Narita, H. Shibai, H. Fuke, Kenta Ueharai, S. Koyama   +35 more
semanticscholar   +1 more source

Capabilities and prospects of the East Asia Very Long Baseline Interferometry Network [PDF]

, 2018
The very long baseline interferometry (VLBI) technique offers angular resolutions superior to any other instruments at other wavelengths, enabling unique science applications of high-resolution imaging of radio sources and high-precision astrometry.
Tao An, Tao An, B. Sohn, Hiroshi Imai
semanticscholar   +1 more source

Peering into the formation history of β Pictoris b with VLTI/GRAVITY long-baseline interferometry [PDF]

Astronomy & Astrophysics, 2019
Context. β Pictoris is arguably one of the most studied stellar systems outside of our own. Some 30 yr of observations have revealed a highly-structured circumstellar disk, with rings, belts, and a giant planet: β Pictoris b. However very little is known
G. Collaboration, M. Nowak, S. Lacour, P. Mollière, J. Wang, B. Charnay, E. Dishoeck, R. Abuter, A. Amorim, J. Berger, H. Beust, M. Bonnefoy, H. Bonnet, W. Brandner, A. Buron, F. Cantalloube, C. Collin, F. Chapron, Y. Clénet, V. C. Foresto, P. Zeeuw, R. Dembet, J. Dexter, G. Duvert, A. Eckart, F. Eisenhauer, N. F. Schreiber, P. F'edou, R. G. Lopez, F. Gao, E. Gendron, R. Genzel, S. Gillessen, F. Haussmann, T. Henning, S. Hippler, Z. Hubert, L. Jocou, P. Kervella, A. Lagrange, V. Lapeyrère, J. L. Bouquin, P. Léna, A. Maire, T. Ott, T. Paumard, C. Paladini, K. Perraut, G. Perrin, L. Pueyo, O. Pfuhl, S. Rabien, C. Rau, G. Rodríguez-Coira, G. Rousset, S. Scheithauer, J. Shangguan, O. Straub, C. Straubmeier, E. Sturm, L. Tacconi, F. Vincent, F. Widmann, E. Wieprecht, E. Wiezorrek, J. Woillez, Ş. Yazici, D. Ziegler   +67 more
semanticscholar   +1 more source

A scalable high-performance magnetic shield for very long baseline atom interferometry. [PDF]

Review of Scientific Instruments, 2019
We report on the design, construction, and characterization of a 10 m-long high-performance magnetic shield for very long baseline atom interferometry. We achieve residual fields below 4 nT and longitudinal inhomogeneities below 2.5 nT/m over 8 m along ...
É. Wodey, D. Tell, E. Rasel, D. Schlippert, R. Baur, U. Kissling, B. Kölliker, M. Lorenz, M. Marrer, U. Schläpfer, M. Widmer, Christian Ufrecht, S. Stuiber, P. Fierlinger   +13 more
semanticscholar   +1 more source