Results 11 to 20 of about 11,793 (207)

Software and Techniques for VLBI Data Processing and Analysis

Universe, 2022
Very-long-baseline interferometry (VLBI) is a challenging observational technique, which requires in-depth knowledge about radio telescope instrumentation, interferometry, and the handling of noisy data.
Michael Janssen, Jack F. Radcliffe, Jan Wagner   +2 more
doaj   +1 more source

Position and Proper Motion of Sagittarius A* in the ICRF3 Frame from VLBI Absolute Astrometry

The Astronomical Journal, 2023
Sagittarius A* (Sgr A*) is a strong, compact radio source believed to be powered by a supermassive black hole at the galactic center. Extinction by dust and gas in the galactic plane prevents observing it optically, but its position and proper motion ...
David Gordon, Aletha de Witt, Christopher S. Jacobs   +2 more
doaj   +1 more source

Toward Microarcsecond Astrometry for the Innermost Wobbling Jet of the BL Lacertae Object OJ 287

The Astrophysical Journal Letters, 2023
The BL Lacertae object OJ 287 is a very unusual quasar producing a wobbling radio jet and some double-peaked optical outbursts with a possible period of about 12 yr for more than one century.
Xiaopeng Cheng, Jun Yang, Guang-Yao Zhao, Bong Won Sohn, Taehyun Jung, Xiaofeng Li   +5 more
doaj   +1 more source

Demonstration of Ultrawideband Polarimetry Using VLBI Exploration of Radio Astrometry (VERA)

Galaxies, 2022
We report on recent technical developments in the front- and back-ends for the four 20 m radio telescopes of the Japanese Very-Long-Baseline Interferometry (VLBI) project, VLBI Exploration of Radio Astrometry (VERA). We present a brief overview of a dual-
Yoshiaki Hagiwara, Kazuhiro Hada, Mieko Takamura, Tomoaki Oyama, Aya Yamauchi, Syunsaku Suzuki   +5 more
doaj   +1 more source

VLBI MultiView Astrometry of Radio Stars

Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022), 2023
The expected emission mechanisms for radio loud M dwarfs include plasma emission, gyrosynchrotron emission during short lived (<2 hrs) flares, and Electron Cyclotron Maser Instability (ECMI) which can occur in planetary aurorae, and interaction between a star and a planetary companion.
Boven, E.P., Vedantham, H.K., Callingham, J.R., Langevelde, H.J. van   +3 more
openaire   +3 more sources

RADIO ASTROMETRY OF THE TRIPLE SYSTEMS ALGOL AND UX ARIETIS [PDF]

The Astrophysical Journal, 2011
We have used multi-epoch long-baseline radio interferometry to determine the proper motion and orbital elements of Algol and UX Arietis, two radio-bright, close binary stellar systems with distant tertiary components. For Algol, we refine the proper motion and outer orbit solutions, confirming the recent result of Zavala et al.
Peterson, W. M., Mutel, R. L., Lestrade, Jean-François, Güdel, Manuel, Goss, W. M.   +4 more
openaire   +6 more sources

The Million Quasars (Milliquas) Catalogue, v8

The Open Journal of Astrophysics, 2023
Announcing the final release, v8, of the Milliquas (Million Quasars) quasar catalogue which presents all published quasars to 30 June 2023, including quasars from the first releases of the Dark Energy Spectroscopic Instrument (DESI) and the SDSS-DR18 ...
Eric Wim Flesch
doaj   +1 more source

The Golden meteorite fall: Fireball trajectory, orbit, and meteorite characterization

Meteoritics &Planetary Science, Volume 58, Issue 12, Page 1773-1807, December 2023., 2023
Abstract The Golden (British Columbia, Canada) meteorite fall occurred on October 4, 2021 at 0534 UT with the first recovered fragment (1.3 kg) landing on an occupied bed. The associated fireball was recorded by numerous cameras permitting reconstruction of its trajectory and orbit. The fireball entered the atmosphere at a 54° angle from the horizontal
P. G. Brown, P. J. A. McCausland, A. R. Hildebrand, L. T. J. Hanton, L. M. Eckart, H. Busemann, D. Krietsch, C. Maden, K. Welten, M. W. Caffee, M. Laubenstein, D. Vida, F. Ciceri, E. Silber, C. D. K. Herd, P. Hill, H. Devillepoix, Eleanor K. Sansom, Martin Cupák, Seamus Anderson, R. L. Flemming, A. J. Nelson, M. Mazur, D. E. Moser, W. J. Cooke, D. Hladiuk, Barbara Malečić, Maja Telišman Prtenjak, R. Nowell, The Golden Meteorite Consortium   +29 more
wiley   +1 more source

The VLA-COSMOS Survey. II. Source Catalog of the Large Project [PDF]

, 2006
The VLA-COSMOS Large Project is described and its scientific objective is discussed. We present a catalog of ~3600 radio sources found in the 2 deg^2 COSMOS field at 1.4 GHz. The observations in the VLA A and C configuration resulted in a resolution of 1.
Aussel, H., Bertoldi, F., Blain, A. W., Bondi, M., Carilli, C. L., Ciliegi, P., Impey, C. D., Jahnke, K., Koekemoer, A. M., Le Fèvre, O., Schinnerer, E., Scoville, N. Z., Smolčić, V., Urry, C. M.   +13 more
core   +3 more sources

Radio Astrometry [PDF]

Symposium - International Astronomical Union, 1984
Radio astrometry is now the premier astrometric technique for measuring the positions of celestial objects. The precision with which absolute positions can be determined is approaching a few milliarc-seconds. The progress towards establishing an almost inertial reference frame based upon the positions of extragalactic radio sources is reviewed as of ...
openaire   +1 more source