scholarly journals Expanding Supernova Remnants and Galactic Radio Sources

1962 ◽  
Vol 124 (2) ◽  
pp. 125-145 ◽  
Author(s):  
H. van der Laan
Keyword(s):  
Supernova Remnants ◽  
Radio Sources ◽  
Galactic Radio

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 5 GHz Polarization Observations of 33 Galactic Radio Sources

1975 ◽  
Vol 28 (2) ◽  
pp. 209 ◽  
Author(s):  
DK Milne ◽  
JR Dickel
Keyword(s):  
Supernova Remnants ◽  
Radio Sources ◽  
5 Ghz ◽  
Galactic Radio

Polarization observations have been made of 33 galactic radio sources, mostly supernova remnants, at a frequency of 5 GHz using the 64 m telescope at Parkes. Maps of the observed polarization vectors superposed upon total intensity isotherms are presented for each source.

scholarly journals Classification of Supernova Remnants and HII Regions from their Recombination Line Emission

1972 ◽  
Vol 25 (5) ◽  
pp. 539 ◽  
Author(s):  
JR Dickel ◽  
DK Milne
Keyword(s):  
Electron Temperature ◽  
Supernova Remnants ◽  
Line Emission ◽  
Hii Regions ◽  
Radio Sources ◽  
Recombination Line ◽  
Line Frequency ◽  
Upper Limits ◽  
Galactic Radio

H109a, recombination line observations are used in an attempt to classify 46 galactic radio sources as either supernova remnants or HII regions. Long integrations at the H109a line frequency on two well-known supernova remnants (IC 443 and 3C 391) provide improved upper limits on the line emission from these objects. From these results the electron temperature in IC 443 is estimated to be in excess of 1�6 � 104 K.

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.

The prevalence of supernova remnants among unidentified Galactic radio sources

1989 ◽  
Vol 341 ◽  
pp. 151 ◽  
Author(s):  
David J. Helfand ◽  
T. Velusamy ◽  
R. H. Becker ◽  
Felix J. Lockman
Keyword(s):  
Supernova Remnants ◽  
Radio Sources ◽  
Galactic Radio

scholarly journals A Catalogue of Galactic Radio Sources

1968 ◽  
Vol 21 (3) ◽  
pp. 369 ◽  
Author(s):  
MJL Kesteven
Keyword(s):  
Flux Density ◽  
Spectral Index ◽  
Galactic Plane ◽  
Radio Sources ◽  
Galactic Radio

The results of a survey of radio sources in the galactic plane in the longitude range 1800 to 400 with the 1 mile Molonglo Cross telescope at 408 MHz are presented. The methods of observation and reduction are described briefly. The catalogue lists the position, flux density, size, and spectral index for 80 sources

scholarly journals Compact Structure in Continuum Radio Sources

1991 ◽  
Vol 44 (6) ◽  
pp. 771
Author(s):  
RT Schilizzi
Keyword(s):  
Supernova Remnants ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Compact Structure ◽  
Scale Structures ◽  
Continuum Radio

Present-day VLBI networks make observations of compact structure in a wide variety of radio sources. Examples are shown of milli-arcsecond scale structures in radio galaxies, quasars, stars and supernova remnants.

scholarly journals Variable Radio Sources

1982 ◽  
Vol 97 ◽  
pp. 317-324 ◽  
Author(s):  
R. Fanti ◽  
L. Padrielli ◽  
M. Salvati
Keyword(s):  
Energy Supply ◽  
Theoretical Models ◽  
Accelerated Expansion ◽  
Radio Sources ◽  
Relativistic Electrons ◽  
Plasma Cloud ◽  
Basic Process ◽  
Continuous Energy ◽  
Galactic Radio ◽  
Variable Radio

Flux variations are a common feature of flat spectrum compact extra-galactic radio sources. Detailed analysis and quantitative comparisons with theoretical models (e.g. van der Laan, 1966) are difficult due to the complex characteristics of the flux variations, which generally appear to consist of different outbursts blended together in time. Nevertheless, the general consensus is that the basic process has been correctly identified and consists in an expansion of a synchrotron radiating plasma cloud of relativistic electrons and magnetic field partially opaque to its own radiation. The main differences between data and predictions of the theory are that the variations propagate too fast and with too large amplitude toward lower frequencies. This behaviour however may be indicative of continuous energy supply and consequent accelerated expansion.

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