scholarly journals Extended Radio Sources. I.

1964 ◽  
Vol 17 (1) ◽  
pp. 106 ◽  
Author(s):  
DK Milne ◽  
PAG Scheuer
Keyword(s):  
Radio Emission ◽  
Principal Component ◽  
Angular Diameter ◽  
Radio Sources ◽  
Pencil Beam ◽  
Optical Identification ◽  
Extended Radio ◽  
Extended Sources ◽  
Galactic Radio Emission ◽  
Galactic Radio

Twenty�one "extended sources" from the catalogues of Mills, Slee, and Hill have been observed with a 14' arc pencil beam at 1400 Mc/s. Some appear to be irregularities in the galactic radio emission, but most, especially those at high galactic latitudes, are resolved into groups of sources of small angular diameter. Maps of the regions are shown, and so far as possible radio spectra of the component sources have been assembled. An optical identification is given for the principal component of MSH 00-017 (3C29), and tentative identifications are suggested for some other sources.

scholarly journals Extended Radio Sources. II.

1965 ◽  
Vol 18 (1) ◽  
pp. 77 ◽  
Author(s):  
PAG Scheuer
Keyword(s):  
Radio Emission ◽  
Angular Diameter ◽  
Radio Sources ◽  
Extended Source ◽  
Previous Communication ◽  
Extended Radio ◽  
Galactic Radio Emission ◽  
Galactic Radio

Detailed observations of "extended radio sources" were reported in a previous communication. Some of these sources are probably irregularities in the galactic radio emission, but at high galactic latitudes the typical extended source consists of a group of sources of small angular diameter.

scholarly journals Radio Emission from Novae and Supernovae

1956 ◽  
Vol 9 (1) ◽  
pp. 84 ◽  
Author(s):  
BY Mills ◽  
AG Little ◽  
KV Sheridan
Keyword(s):  
Radio Emission ◽  
Supernova Remnants ◽  
Milky Way ◽  
Radio Sources ◽  
Constant Ratio ◽  
Radio Observations ◽  
Maximum Emission ◽  
Galactic Radio Emission ◽  
Galactic Radio

Attempts have been made to observe the radio emission at 3?5 m from two supernovae and ten novae. Kepler's star was the only reasonably certain identification. A comparison with radio observations of other supernova remnants suggests a constant ratio between the present radio emission and the maximum emission of light. It is concluded that for common novae, which are not detectable as radio sources, this ratio must be smaller than for supernovae. The galactic radio emission near the plane of the Milky Way could be largely the integrated emission of supernova remnants but common novae could not contribute appreciably.

scholarly journals Some Observations of Shell-type Galactic Radio Sources

1967 ◽  
Vol 20 (3) ◽  
pp. 297 ◽  
Author(s):  
ER Hill
Keyword(s):  
Radio Emission ◽  
Spherical Symmetry ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Milky Way ◽  
Radio Sources ◽  
Radio Observations ◽  
Shell Type ◽  
Rosette Nebula ◽  
Galactic Radio

Radio evidence for two new supernova remnants in the Southern Milky Way is presented. Some new observations of the known supernova remnant, source 1439-62, and of the Rosette nebula, a shell source but not a supernova remnant, are also presented. The problem of finding model shells to fit the radio observations is considered and it is shown that the radio emission from 1439-62 is unlikely to originate in a shell with spherical symmetry.

scholarly journals Clusters with extended radio emission at high frequencies

1978 ◽  
Vol 79 ◽  
pp. 157-159
Author(s):  
R. Wielebinski
Keyword(s):  
Radio Emission ◽  
Direct Measurement ◽  
Radio Sources ◽  
Clusters Of Galaxies ◽  
Coma Cluster ◽  
Extended Source ◽  
High Frequencies ◽  
Extended Radio ◽  
Extended Component ◽  
Perseus Cluster

The existence of ‘haloes’ in clusters of galaxies was deduced by Ryle and Windram (1968) for the Perseus cluster and by Willson (1970) for the Coma cluster at 408 MHz by comparing total flux measured by a single dish with the sum of fluxes of radio sources found in the field. A direct measurement of the extended source Coma C was made by Jaffe et al. (1976) at 610 MHz. the failure to detect the halo of Coma at higher frequencies is attributed by all authors to a steep spectrum of this extended component.

scholarly journals The Intergalactic Medium

1982 ◽  
Vol 97 ◽  
pp. 453-459
Author(s):  
A. C. Fabian ◽  
A. K. Kembhavi
Keyword(s):  
Radio Emission ◽  
Intergalactic Medium ◽  
Radio Sources ◽  
Clusters Of Galaxies ◽  
Intergalactic Gas ◽  
X Ray ◽  
Extended Radio ◽  
X Ray Background ◽  
Ngc 1275 ◽  
Intracluster Gas

The density of intergalactic gas may be an important parameter in the formation of extended radio sources. It may range from ∼ 0.1 particle cm−3 in the centres of some rich clusters of galaxies down to 10−8cm−3 or less in intercluster space. The possible influence of the intracluster gas surrounding NGC 1275 on its radio emission is discussed, and the possibility that a significant fraction of the X-ray background is due to a hot intergalactic medium is explored in some detail.

Site evaluation and RFI spectrum measurements in Portugal at the frequency range 0.408–10GHz for a GEM polarized galactic radio emission experiment

New Astronomy ◽  
2006 ◽  
Vol 11 (8) ◽  
pp. 551-556 ◽  
Author(s):  
Rui Fonseca ◽  
Domingos Barbosa ◽  
Luis Cupido ◽  
Ana Mourão ◽  
Dinis M. dos Santos ◽  
...  
Keyword(s):  
Radio Emission ◽  
Frequency Range ◽  
Spectrum Measurements ◽  
Site Evaluation ◽  
Galactic Radio Emission ◽  
Galactic Radio
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