Results 111 to 120 of about 101,827 (259)
Determination of optical positions for 22 southern extragalactic radio sources
, 2002 In this paper optical positions relative to UCAC1 for 22 counterparts of extragalactic radio sources in the southern hemisphere are presented. The internal accuracy of the positions is of the order of 0."060.
Jin, WJ, Wang, SH, Tang, ZH
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John Bolton and the nature of discrete radio sources [PDF]
, 2015 John Bolton is regarded by many to be the pre-eminent Australian astronomer of his generation. In the late 1940s he and his colleagues discovered the first discrete sources of radio emission. Born in Sheffield in 1922 and educated at Cambridge University,
Robertson, Peter
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Flaring γ-Ray Emission from High Redshift Blazars
Galaxies, 2016 High redshift blazars are among the most powerful objects in the Universe. Although they represent a significant fraction of the extragalactic hard X-ray sky, they are not commonly detected in γ-rays. High redshift ( z > 2 ) objects represent
Monica Orienti +4 more
doaj +1 more source
Search for compact extragalactic radio sources near massive star-forming regions
, 2006 We have used the Very Large Array to search for compact milliarcsecond- size radio sources near methanol masers in high-mass star-forming regions. Such sources are required for very long baseline Interferometry phase-referencing observations.
Reid, M. J. +3 more
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Redshifts of five extragalactic radio sources
, 1983 Information regarding the distances of extragalactic radio sources is needed for a determination of the intrinsic parameters of individual sources and the study of the cosmological effects in the population as a whole.
Warner, P. J. +4 more
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On the Identification of Extragalactic Radio Sources [PDF]
Australian Journal of Physics, 1960 Identifications of radio sources with galaxies and clusters of galaxies have been sought systematically in a limited region of the sky. The optical data have been taken principally from the National Geographic Society-Palomar Observatory Sky Atlas and a catalogue of clusters of galaxies prepared by Abell (1958) from the same Atlas.
openaire +1 more source
Extragalactic Radio Sources as a Piece of the Cosmological Jigsaw [PDF]
, 2018 Early on, extragalactic radio sources have pointed to a cosmologically evolv- ing Universe. They were also an important piece of evidence for the existence of supermassive black holes, now thought to be a key component of galaxies.
Krause, M.
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Identification of Extragalactic Radio Sources Between Declinations ?20° and ?44°
, 1965 Identifications with extragalactic objects are suggested for 55 radio sources with declinations between _200 and _44 . The identifications are based on a search of the Palomar Sky Survey plates in the position of sources in the Parkes catalogue. Eight of
RD Ekers, JG Bolton, Margaret E Clarke
core +1 more source
The Variability of Persistent Radio Sources of Fast Radio Bursts
The Astrophysical JournalOver 700 bright millisecond-duration radio transients, known as fast radio bursts (FRBs), have been identified to date. Nevertheless, the origin of FRBs remains unknown.
Ai Yuan Yang +15 more
doaj +1 more source
A Deep VLA Search for a Persistent Radio Counterpart to the One-off FRB 20250316A
The Astrophysical Journal LettersFast radio burst (FRB) 20250316A, detected by CHIME on 2025 March 16 with a fluence of 1.7 ± 0.1 kJy ms and a dispersion measure of 161.3 ± 0.4 pc cm ^−3 , ranks among the brightest extragalactic FRBs at ∼40 Mpc. We obtain deep Karl G.
Tao An +6 more
doaj +1 more source