High-Resolution Observations of Small-Diameter Radio Sources at 18-CENTIMETER Wavelength

1968 ◽  
Vol 153 ◽  
pp. 705 ◽  
Author(s):  
B. G. Clark ◽  
K. I. Kellermann ◽  
C. C. Bare ◽  
M. H. Cohen ◽  
D. L. Jauncey
Keyword(s):  
High Resolution ◽  
Small Diameter ◽  
Radio Sources

The Heights of Solar Radio Sources at 1424 MHz and 696 MHz

1969 ◽  
Vol 1 (5) ◽  
pp. 192-194 ◽  
Author(s):  
D. G. Cole ◽  
R. F. Mullaly
Keyword(s):  
Solar Activity ◽  
High Resolution ◽  
Solar Disk ◽  
Previous Investigation ◽  
Solar Radio ◽  
Radio Sources ◽  
Grating Interferometer ◽  
Maximum Solar Activity

The heights of solar radio sources at 1424 MHz and 696 MHz have been measured during the years 1965 and 1966. Solar activity at this time was near minimum. The number of radio sources appearing on the solar disk rarely exceeded three at any time and it thus was possible to resolve the majority of these with a high resolution grating interferometer. Many of the previous height measurements at these frequencies have been made near times of maximum solar activity and the confusion of sources within the beam has limited their accuracy. The number of sources studied here is quite considerably higher than in any previous investigation at these frequencies, and the period of observation has been continuous.

scholarly journals High-resolution VLA low radio frequency observations of the Perseus cluster: radio lobes, mini-halo, and bent-jet radio galaxies

2020 ◽  
Vol 499 (4) ◽  
pp. 5791-5805
Author(s):  
M Gendron-Marsolais ◽  
J Hlavacek-Larrondo ◽  
R J van Weeren ◽  
L Rudnick ◽  
T E Clarke ◽  
...  
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Galaxy Cluster ◽  
High Dynamic Range ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Nearby Galaxy ◽  
Cluster Galaxy ◽  
Ngc 1275 ◽  
Perseus Cluster

ABSTRACT We present the first high-resolution 230–470 MHz map of the Perseus cluster obtained with the Karl G. Jansky Very Large Array. The high dynamic range and resolution achieved have allowed the identification of previously unknown structures in this nearby galaxy cluster. New hints of sub-structures appear in the inner radio lobes of the brightest cluster galaxy NGC 1275. The spurs of radio emission extending into the outer X-ray cavities, inflated by past nuclear outbursts, are seen for the first time at these frequencies, consistent with spectral aging. Beyond NGC 1275, we also analyse complex radio sources harboured in the cluster. Two new distinct, narrowly collimated jets are visible in IC 310, consistent with a highly projected narrow-angle tail radio galaxy infalling into the cluster. We show how this is in agreement with its blazar-like behaviour, implying that blazars and bent-jet radio galaxies are not mutually exclusive. We report the presence of filamentary structures across the entire tail of NGC 1265, including two new pairs of long filaments in the faintest bent extension of the tail. Such filaments have been seen in other cluster radio sources such as relics and radio lobes, indicating that there may be a fundamental connection between all these radio structures. We resolve the very narrow and straight tail of CR 15 without indication of double jets, so that the interpretation of such head–tail sources is yet unclear. Finally, we note that only the brightest western parts of the mini-halo remain, near NGC 1272 and its bent double jets.

scholarly journals VLBI Observations of Southern EGRET Identifications

1996 ◽  
Vol 175 ◽  
pp. 19-20
Author(s):  
J.E.J. Lovell ◽  
S.J. Tingay ◽  
P.G. Edwards ◽  
D.L. Jauncey ◽  
R.A. Preston
Keyword(s):  
High Resolution ◽  
Southern Hemisphere ◽  
Gamma Ray ◽  
Radio Sources ◽  
Vlbi Observations ◽  
First Results

We present high resolution VLBI images of three southern radio sources: PKS 0208–512, PKS 0521–365 and PKS 0537–441. These sources have been identified as > 100 MeV gamma-ray sources with the Energetic Gamma-Ray Telescope (EGRET) on board the Compton Gamma-Ray Observatory (Thompson et al. 1995). These are the first results in a continuing program of VLBI observations of southern EGRET identifications with the Southern Hemisphere VLBI Experiment (SHEVE) array of telescopes (Jauncey et al., 1994).

scholarly journals VLA observations of 20 FR II radio sources at 8.4 GHz

2019 ◽  
Vol 364 (10) ◽  
Author(s):  
Ilias Fernini
Keyword(s):  
High Resolution ◽  
Hot Spots ◽  
Radio Galaxies ◽  
Class Ii ◽  
Outer Edge ◽  
Radio Sources ◽  
Large Sample ◽  
Contour Maps ◽  
Surrounding Environment

Abstract We report the last observational paper of hot spots for 20 Fanaroff-Riley class II (FR II) sources. These sources are part of a large sample of 98 FR II to study the unification scheme of FR II radio galaxies (RGs) and quasars (QSRs) using the hotspots (HSs) location and morphology. High-resolution VLA observations at 8.4 GHz were conducted for the whole sample. The investigation of HSs properties in FR II radio sources is essential for a better understanding of the dynamics related to the objects and their impact on the surrounding environment. HSs were classified into edged and recessed types, where the former is located at a radio lobe’s outer edge, and the latter is embedded within the lobe. The present sub-sample contains 12 RGs and 8 QSRs. Radio contour maps for each source were presented using the VLA in its A and B configurations. In total, we have identified 18 HSs for these 20 radio sources. The 12 RGs possess 8 edged HSs and 2 recessed HSs. The 8 QSRs possess 6 edged HSs and 2 recessed HSs. Out of the 14 edged HSs, RGs and QSRs possess $\sim57\%$∼57% and $\sim43\%$∼43%, respectively. A thorough morphological discussion of the 20 sources with their HSs is presented in the present work.

scholarly journals Magnetic Field Configuration in 4C 39.25

1998 ◽  
Vol 164 ◽  
pp. 115-116 ◽  
Author(s):  
A. Alberdi ◽  
L. Lara ◽  
J.L. Gómez ◽  
J.M. Marcaide ◽  
M.A. Pérez-Torres ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Radio Emission ◽  
Field Configuration ◽  
Radio Sources ◽  
Magnetic Field Configuration ◽  
Relativistic Jet ◽  
Scale Structures ◽  
The Magnetic Field

AbstractWe have performed simultaneous multi-frequency polarization VLBA observations of the compact radio sources 3C 395 and 4C 39.25 which show both stationary and superluminal components in their parsec-scale structures. Those of 3C 395 have been reported elsewhere. Here we report on high resolution maps of the total intensity and polarized radio emission of 4C 39.25, trace the magnetic field configuration along the jet, and explore different possibilities for the nature of the components within the framework of the bent shocked relativistic jet model.

scholarly journals Determination of Bioactive Compounds in the Juice of Pummelo (Citrus grandis Osbeck)

2013 ◽  
Vol 8 (2) ◽  
pp. 1934578X1300800 ◽  
Author(s):  
Marina Russo ◽  
Ivana Bonaccorsi ◽  
Germana Torre ◽  
Antonella Cotroneo ◽  
Paola Dugo ◽  
...  
Keyword(s):  
High Resolution ◽  
Bioactive Compounds ◽  
Heterocyclic Compounds ◽  
Small Diameter ◽  
Negative Mode ◽  
Short Analysis Time ◽  
Citrus Juices ◽  
C30 Column ◽  
First Time

The juice of pummelo (Citrus grandis Osbeck) was analyzed to determine its composition of flavonoids, polymethoxyflavones, coumarins and psoralens. The analyses were carried out by HPLC using columns packed with small diameter Fused-Core® C18 particles to achieve high resolution in short analysis time. In addition, the profile of the native carotenoids present in the juice was determined using a C30 column. Identification of flavonoids was achieved by MS with ESI in negative mode; the MS acquisition of oxygenated heterocyclic compounds was performed in positive APCI; carotenoids were detected with a PDA detector. Nineteen native carotenoids were determined in pummelo juice for the first time. The composition of this juice is also discussed in comparison with other Citrus juices, especially grapefruit.

The use of high-resolution digital imaging technology for small diameter K-file length determination in endodontics

2009 ◽  
Vol 14 (2) ◽  
pp. 223-231 ◽  
Author(s):  
Bart Vandenberghe ◽  
Marius Bud ◽  
Asti Sutanto ◽  
Reinhilde Jacobs
Keyword(s):  
High Resolution ◽  
Digital Imaging ◽  
Small Diameter ◽  
Imaging Technology ◽  
Digital Imaging Technology ◽  
Length Determination

scholarly journals High-resolution observations of a complete sample of radio sources variable at 151-MHz

1994 ◽  
Vol 269 (1) ◽  
pp. 166-175 ◽  
Author(s):  
J. M. Riley ◽  
P. J. Warner
Keyword(s):  
High Resolution ◽  
Radio Sources ◽  
Complete Sample

High-Resolution Observations of Compact Radio Sources at 13 Centimeters

1970 ◽  
Vol 161 ◽  
pp. 803 ◽  
Author(s):  
K. I. Kellermann ◽  
B. G. Clark ◽  
D. L. Jauncey ◽  
M. H. Cohen ◽  
D. B. Shaffer ◽  
...  
Keyword(s):  
High Resolution ◽  
Radio Sources
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