Results 21 to 30 of about 38,529 (262)
Radio Science, Volume 57, Issue 9, September 2022., 2022 Abstract This article focuses on the new generation of geodetic very long baseline interferometry (VLBI), the VLBI global observing system (VGOS), and measurements carried out during the CONT17 campaign. It uses broadband technology that increases both the number and precision of observations.
Sanam Motlaghzadeh +4 more
wiley +1 more source
CATALOG OF VARIABILITY PERIODS OF EXTRAGALACTIC RADIO SOURCES AT CENTIMETER WAVELENGTHS
Radio Physics and Radio Astronomy, 2016 Purpose: Study of the variability of flux density of extragalactic radio sources (3C 273, 3C 120, 3C 345, 3C 446, 3C 454.3, OJ 287, OT 081, BL Lac, DA 55, CTA 102) according to a long-term (1965–2011) monitoring at 14.5, 8, 4.8 GHz made with a 26-m ...
M. I. Ryabov +2 more
doaj +1 more source
Space Weather, Volume 20, Issue 3, March 2022., 2022 Abstract High‐energetic charged particles, such as solar protons, and phenomena such as Forbush decreases are eligible candidates to affect the global electric circuit. These effects have been studied by analyzing disturbances of the potential gradient in ground‐based measurements in fair weather regions. In this paper, we investigate deviations in the
J. Tacza +6 more
wiley +1 more source
Progress and Challenges in Electromechanical Coupling of Radio Telescopes
International Journal of Antennas and Propagation, Volume 2022, Issue 1, 2022., 2022 Radio astronomy is a discipline of dynamics and wonders. The vast universe has many secrets to unravel. As one of the important facilities in this discipline, radio telescopes play a key role in collecting astronomical data and unraveling mysteries.
Yuefei Yan +10 more
wiley +1 more source
ROSAT Studies of Extragalactic Radio Sources [PDF]
Symposium - International Astronomical Union, 1996 Complementary information over a large energy range appears to be the best way to study the class properties of Active Galactic Nuclei (AGN). While radio data provide superior spatial resolution required for the analysis of source structures and their morphology, optical data are a necessary ingredient for the classification of the objects and for the ...
W. Brinkmann, J. Siebert, W. Yuan
openaire +1 more source
Radio Physics and Radio Astronomy, 2017 Purpose: From April 2017, a monitoring program of observations has been started at the RT-16 telescope of Ventspils Radio Astronomy Center (frequencies 5, 6.1, 6.7, 8.4 GHz) to study the intraday and interdiurnal variability of extragalactic radio ...
A. L. Sukharev +4 more
doaj +1 more source
Luminous Radio Emission from the Superluminous Supernova 2017ens at 3.3 yr after Explosion
The Astrophysical Journal Letters, 2023 We present the results from a multiyear radio campaign of the superluminous supernova (SLSN) SN 2017ens, which yielded the earliest radio detection of an SLSN to date at the age of ∼3.3 yr after explosion. SN 2017ens was not detected at radio frequencies
Raffaella Margutti +19 more
doaj +1 more source
, 2014 Although the extragalactic nature of 3C 48 and other quasi stellar radio sources was discussed as early as 1960 by John Bolton and others, it was rejected largely because of preconceived ideas about what appeared to be unrealistically high radio and ...
Kellermann, K. I.
core +1 more source
A search for candidate radio supernova remnants in the nearby irregular starburst galaxies NGC 4214 and NGC 4395 [PDF]
Serbian Astronomical Journal, 2005 We present the results of a search for new candidate radio supernova remnants (SNRs) in the nearby starburst irregular galaxies NGC 4214 and NGC 4395 using archived radio observations made with the Very Large Array (VLA) at the wavelengths of 3.5 cm, 6 ...
Vukotić B. +3 more
doaj +1 more source
Radio Wavelength Constraints on the Sources of the Far Infrared Background [PDF]
, 1998 The cosmic far infrared background detected recently by the COBE-DIRBE team is presumably due, in large part, to the far infrared (FIR) emission from all galaxies.
Bridle A. H. +8 more
core +3 more sources