Results 111 to 120 of about 11,945,723 (183)

The First Measurement of Jet Collimation Profiles in an X-Ray Binary: The Case of SS 433

The Astrophysical Journal Letters
While significant progress has been achieved in active galactic nuclei, jet collimation profiles in X-ray binaries (XRBs) have not been directly measured. Here we report the first measurement of jet collimation profiles in an XRB using very long baseline
Xi Yan, Lang Cui, Zsolt Paragi, Sándor Frey   +3 more
doaj   +1 more source

A Brief Review of Spin Signatures in Time-Averaged Total Intensity Images of LLAGN Accretion Flows

Galaxies
As images of the supermassive black holes Messier 87* (M87*) and Sagittarius A* (Sgr A*) from the Event Horizon Telescope (EHT) grow in number, we gain a better understanding of the typical conditions of the near-horizon region of these objects, and ...
Daniel C. M. Palumbo
doaj   +1 more source

The Subparsec-scale Structure and Evolution of Centaurus A. III. A Multi-epoch Spectral and Polarimetric VLBA Study

The Astronomical Journal
The Centaurus A radio galaxy, due to its proximity, presents itself as one of the few systems that allow the study of relativistic jet outflows at subparsec distances from the central supermassive black holes, with high signal to noise.
S. Prabu, S. J. Tingay, A. Bahramian, J. C. A. Miller-Jones, C. M. Wood, S. P. O’Sullivan   +5 more
doaj   +1 more source

Unveiling the Complex Jet Dynamics in the Blazar 2021+317 through Multiepoch Very Long Baseline Interferometry Observations

The Astrophysical Journal
We present an investigation of the compact structure of the active galactic nucleus 2021+317 based on multiepoch very long baseline interferometry (VLBI) observations at 15, 22, and 43 GHz in the period from 2013 through 2024. The VLBI images show a core–
Haitian Shang, Wei Zhao, Xiaoyu Hong, Leonid I. Gurvits, Ailing Zeng, Tao An, Xiaopeng Cheng   +6 more
doaj   +1 more source

Degree-1 earth deformation from very long baseline interferometry measurements

The presence of degree-1 deformations in very long baseline interferometry (VLBI) measurements is detected for the first time. We compare VLBI measurements with the deformation field predicted using a GPS-determined load moment.
Blewitt G, Lavallée DA
core   +4 more sources

Fringe Detection in the Lunar Orbit VLBI Experiment: The Initial Clock Search

The Astronomical Journal
We present the design and implementation of a fringe detection pipeline for the Lunar Orbit VLBI Experiment (LOVEX) on board China’s Queqiao-2 cislunar relay satellite. To address the challenge posed by limited space–ground time synchronization accuracy,
Lei Liu, Fengxian Tong, Juan Zhang, Weimin Zheng   +3 more
doaj   +1 more source

Very Long Baseline Interferometry for Global Geodetic Reference Frames

, 2019
Die geodätische Very Long Baseline Interferometry (VLBI) ist das einzige Verfahren zur Bestimmung aller Erdorientierungsparameter und für die Realisierung des International Celestial Reference Frame (ICRF) im Radiowellenbereich.
Krasna, Hana, Mayer, David, Schartner, Matthias, Böhm, Johannes, Böhm, Sigrid, Gruber, Jakob, Hellerschmied, Andreas, Landskron, Daniel   +7 more
core   +1 more source

Parameter estimation from amplitude collapse in correlated matter-wave interference. [PDF]

Sci Adv
Derr D, Pfeiffer D, Lind L, Birkl G, Giese E.   +4 more
europepmc   +1 more source

A prototype differential atom interferometer for fundamental physics. [PDF]

Nature
Baynham CFA, Hobson R, Buchmüller O, Evans D, Hawkins L, Iannizzotto Venezze L, Josset A, Lee D, Pasatembou E, Sauer BE, Tarbutt MR, Walker T, Ennis O, Chauhan U, Brzakalik A, Dey S, Hedges S, Stray B, Langlois M, Bongs K, Hird T, Lellouch S, Holynski M, Bostwick B, Chen J, Eyler Z, Gibson V, Harte TL, Hsu CC, Karzazi M, Lu C, Millward B, Mitchell J, Mouelle N, Panchumarthi B, Scheper J, Schneider U, Su X, Tang Y, Tkalčec K, Zeuner M, Zhang S, Zhi Y, Badurina L, Beniwal A, Blas D, Carlton J, Ellis J, McCabe C, Parish G, Govardhan DP, Vaskonen V, Bowcock T, Bridges K, Carroll A, Coleman J, Elertas G, Hindley S, Metelko C, Throssell H, Tinsley JN, Bentine E, Booth M, Bortoletto D, Callaghan N, Foot C, Gómez-Monedero C, Hughes K, James A, Leese T, Lowe A, March-Russell J, Sander J, Schelfhout J, Shipsey I, Weatherill D, Wood D, Balashov SN, Bason MG, Hussain K, Labiad H, Majewski P, Marchant AL, Newbold D, Pan Z, Tam Z, Thornton TC, Valenzuela T, van der Grinten MGD, Wilmut I, Clarke K, Vick A, AION Collaboration.   +92 more
europepmc   +1 more source

Imaging black holes: a VLBI success story. [PDF]

Astrophys Space Sci
Zensus JA.
europepmc   +1 more source