scholarly journals A Catalogue of Small-diameter Radio Sources Close to the Galactic Plane

1974 ◽  
Vol 27 (5) ◽  
pp. 713 ◽  
Author(s):  
DH Clark ◽  
DF Crawford
Keyword(s):  
Flux Density ◽  
Galactic Plane ◽  
Small Diameter ◽  
Hii Regions ◽  
Radio Sources ◽  
Galactic Radio

A catalogue of 'smaIl-diameter' galactic radio sources observed at a frequency of 408 MHz with the Molonglo radiotelescope is presented. The catalogue covers an area of 0�40 sr enclosed in the range [II = 190�-360�-50�, 1 bIll..;; 3�. The sources listed are those which show no significant broadening of the ~ 3' arc aerial beam. Small-diameter features bounded or confused by extended regions of emission are not included. A total of 513 sources are listed above a flux density of O' 6 Jy. While most of these are expected to be extragalactic, the list includes some known pulsars and small-diameter HII regions. The catalogue should form a useful search list for the identification of other such galactic objects.

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 8·8 GHz Radio Observations of 12 Suggested Supernova Remnants

1973 ◽  
Vol 26 (3) ◽  
pp. 379 ◽  
Author(s):  
JR Dickel ◽  
DK Milne ◽  
AR Kerr ◽  
JG Ables
Keyword(s):  
Flux Density ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Galactic Plane ◽  
Small Diameter ◽  
Radio Sources ◽  
Radio Observations ◽  
Frequency Measurements ◽  
Thermal Spectrum

Brightness distributions and flux densities at 8�8 GHz are presented for 12 small-diameter radio sources near the galactic plane. Each of these sources has been classified at one time or another as a supernova remnant. For one source, G295� 2 - 0�6, the flux density at 8�8 GHz confirms the thermal spectrum suggested by lower frequency measurements and indicates that it is not a supernova remnant. Another source, G309� 6+ 1�7, is thought to be extragalactic.

A catalog of small-diameter radio sources in the Galactic plane

1990 ◽  
Vol 74 ◽  
pp. 181 ◽  
Author(s):  
S. Zoonematkermani ◽  
D. J. Helfand ◽  
R. H. Becker ◽  
R. L. White ◽  
R. A. Perley
Keyword(s):  
Galactic Plane ◽  
Small Diameter ◽  
Radio Sources

scholarly journals The Parkes 2700 MHz Survey (Tenth Part). Supplementary Catalogue for the Declination Zone +4° to +25°

1975 ◽  
Vol 28 (2) ◽  
pp. 239
Author(s):  
AJ Shimmins ◽  
JG Bolton ◽  
JV Wall
Keyword(s):  
Flux Density ◽  
Galactic Plane ◽  
Radio Sources ◽  
Stellar Objects ◽  
Quasi Stellar Objects

A catalogue of lSI radio sources is presented covering the declination zone +4� to +25� and all right ascensions, omitting two regions within approximately 10� of the galactic plane (R.A. 05h30'" to 07ho()m and R.A. lShOO'" to 2Oh30"'). The catalogue was compiled from a 'fast' finding survey at 2700 MHz aimed at detecting sources stronger than o� 5 Jy. Subsequently, measurements of accurate flux density and position were made on all the sources which were not in the Parkes 40S MHz catalogue and on a few sources in the 40S MHz catalogue for which only data of low accuracy were available. The' positions of sources were determined to an accuracy of 10" arc r.m.s. in both coordinates. Flux densities for most of the sources were also measured at 5009 MHz. Identifications are suggested for 17 galaxies and 62 quasi-stellar objects.

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 5000 MHz Flux Densities and Spectra for 325 Small-diameter Radio Sources at Low Galactic Latitudes

1975 ◽  
Vol 28 (5) ◽  
pp. 633 ◽  
Author(s):  
JL Caswell ◽  
RF Haynes ◽  
DH Clark
Keyword(s):  
Flux Density ◽  
Small Diameter ◽  
Radio Sources ◽  
Density Measurements

Flux density measurements at 5000 MHz are presented for 325 of the small-diameter sources detected in the Molonglo 408 MHz galactic survey. By investigating the spectra we show that probably between 10 % and 15 % of the sources are galactic and the remainder extragalactic.

scholarly journals The Number-Flux Density Relation for Radio Sources away from the Galactic Plane

1961 ◽  
Vol 122 (5) ◽  
pp. 389-397 ◽  
Author(s):  
P. F. Scott ◽  
M. Ryle
Keyword(s):  
Flux Density ◽  
Galactic Plane ◽  
Radio Sources ◽  
Density Relation

Extra-galactic Radio Sources with Extended Structure

1970 ◽  
Vol 1 (7) ◽  
pp. 337-340 ◽  
Author(s):  
R. T. Schilizzi ◽  
W. B. McAdam
Keyword(s):  
Large Fraction ◽  
Small Diameter ◽  
Low Frequency ◽  
Brightness Distribution ◽  
Radio Sources ◽  
Double Structure ◽  
Long Baseline ◽  
Wide Range ◽  
Galactic Sources ◽  
Galactic Radio

Most extra-galactic radio sources show angular structure over a wide range of size. Long-baseline interferometers and scintillation observations have shown that resolved sources extending over 10′ arc can have significant contributions from components <1″ arc. Observations at low frequency with the Molonglo cross telescope show also that a large fraction of the emission can come from halo, bridge or extended regions which may form a diffuse ridge or arc structure extending well beyond the small diameter components. However the majority of sources exhibit a basic double structure, and this has led to the adoption of two extended (Gaussian) components as an initial model for the interpretation of brightness distribution in most papers on the structure of extra-galactic sources. Parameters based on such a model will usually match the observed distribution quite well, but because of confusion, there is a danger in using intensity parameters for a model component to derive the spectral index for part of the source.

scholarly journals The Parkes 2700 MHz Survey (Ninth Part). Supplementary Catalogue for the Declination Zone ?45° to ?65°

1975 ◽  
Vol 28 (2) ◽  
pp. 239
Author(s):  
JV Wall ◽  
AJ Shimmins ◽  
JG Bolton
Keyword(s):  
Flux Density ◽  
Galactic Plane ◽  
Radio Sources ◽  
The Third

A catalogue of 166 radio sources is presented, covering an area of 0�63 sr with right ascensions 0Qh to 03h, 04h to OSh 30"', 17h 30'" to 19h and 20b to 23h between declinations -45� and - 65�. The regions omitted are either close to the galactic plane (OSh 30'" to 17h 30"') or are covered in the third part of the Parkes 2700 MHz survey. The catalogue was compiled from a 'fast' finding survey at 2700 MHz aimed at detecting sources stronger than o� 5 Jy. Subsequent measurements at 2700 and 5009 MHz of flux density and position were made for all sources which were not in the Parkes 40S MHz catalogue and for 42 sources in the 40S MHz catalogue for which only data of low accuracy were available.

scholarly journals Intensity Distribution of Interplanetary Scintillation at 408 MHz

1975 ◽  
Vol 28 (5) ◽  
pp. 621 ◽  
Author(s):  
RG Milne
Keyword(s):  
Flux Density ◽  
Intensity Distribution ◽  
Small Diameter ◽  
Point Sources ◽  
Radio Sources ◽  
Interplanetary Scintillation ◽  
The Core ◽  
Intensity Fluctuations

It is shown that interplanetary scintillation of small-diameter radio sources at 408 MHz produces intensity fluctuations which are well fitted by a Rice-squared. distribution, better so than is usually claimed. The observed distribution can be used to estimate the proportion of flux density in the core of 'core-halo' sources without the need for calibration against known point sources.

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