Results 81 to 90 of about 909 (203)
, 2007 The special VLBI techniques used to obtain accurate absolute or relative positions of radio sources are discussed. Contents 19.1 Types of Astrometry : : : : : : : : : : : : : : : : : : : : : : : 364 19.1.1 Absolute Astrometry : : : : : : : : : : : : :
Edward Fomalont
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Stellar radio beacons for Galactic astrometry
, 2020 A century ago, it was unclear whether the stars in the sky were clustered in groups, or widely spread in the universe. Without accurate stellar distances, it was impossible to obtain a reliable spatial stellar distribution to know which stars are part ...
Quiroga Nunez, L.H.
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Radio-loudness Statistics of Quasars from Quaia-VLASS
The Astrophysical Journal Supplement SeriesQuasars are objects of high interest in extragalactic astrophysics, cosmology, and astrometry. One of their useful qualities is their potential radio-loudness.
Nestor Arsenov +3 more
doaj +1 more source
VERA monitoring of a blazar OJ 287
EPJ Web of Conferences, 2013 We present the frequent VLBI monitoring results of blazar OJ 287 at 22 GHz band using the VLBI Exploration of Radio Astrometry (VERA) from 2010 November to 2012 September. Time interval of the monitoring is typically once or twice per month.
Sawada-Satoh S. +4 more
doaj +1 more source
Radio Follow-up Observations of SN 2023ixf by Japanese and Korean Very Long Baseline Interferometers
The Astrophysical JournalWe report on radio follow-up observations of the nearby Type II supernova SN 2023ixf, spanning from 1.7 to 269.9 days after the explosion, conducted using three very long baseline interferometers (VLBIs), which are the Japanese VLBI Network, the VLBI ...
Yuhei Iwata +12 more
doaj +1 more source
High Resolution Near-Infrared Imaging Observations of the Galactic Centre [PDF]
, 2004 Ziel der vorliegenden Doktorarbeit war es, neue Erkenntnisse über die Struktur, Zusammensetzung und Dynamik des zentralen Sternhaufens unserer Milchstraße zu gewinnen.
Schödel, R. +2 more
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A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz
The Astronomical JournalExtending geodetic and astrometric Very Long Baseline Interferometry (VLBI) observations from traditional centimeter wavebands to millimeter wavebands offers numerous scientific potentials and benefits. However, it was considered quite challenging due to
Shuangjing Xu +16 more
doaj +1 more source
VLA+PT Astrometry of 46 Radio Stars
, 2006 We have used the Very Large Array (VLA), linked with the Pie Town Very Long Baseline Array antenna, to determine astrometric positions of 46 radio stars in the International Celestial Reference Frame (ICRF). Positions were obtained in the ICRF directly through phase referencing of the stars to nearby ICRF quasars whose positions are accurate at the 0 ...
Boboltz, D. A. +6 more
openaire +2 more sources
High-Precision Radio and Infrared Astrometry of Lspm J1314+1320ab. I. Parallax, Proper Motions, and Limits on Planets [PDF]
, 2016 We present multi-epoch astrometric radio observations with the Very Long Baseline Array (VLBA) of the young ultracool-dwarf binary LSPM J1314+1320AB . The radio emission comes from the secondary star.
Reid, Mark +9 more
core +1 more source
Radio Astrometry towards the Nearby Universe with the SKA
, 2016 16 pages, 13 figures, Chapter in the SKA Japan Science Book, provided by SKA Japan Astrometry Science Working ...
Imai, Hiroshi +7 more
openaire +2 more sources