scholarly journals Australian Journal of Physics Astrophysical Supplements

1972 ◽  
Vol 25 (6) ◽  
pp. 779 ◽  
Author(s):  
GA Day ◽  
JL Caswell ◽  
DJ Cooke
Keyword(s):  
Radio Telescope ◽  
Galactic Plane ◽  
Australian Journal ◽  
Radio Sources ◽  
Contour Maps ◽  
Half Power

The results of observations of the galactic plane in the longitude ranges 46� to 61� and 190� to 290� undertaken with the 64 m (210 ft) radio telescope of the Parkes Observatory are given in the form of contour maps and a list of 343 radio sources. At the observing frequency of 2700 MHz the half-power beamwidth was 8'�2 arc. Some individual sources are discussed in detail. The present results together with those already published complete the Parkes 11 cm survey of the galactic plane.

scholarly journals Australian Journal of Physics Astrophysical Supplement

1970 ◽  
Vol 23 (5) ◽  
pp. 613 ◽  
Author(s):  
WM Goss ◽  
PA Shaver
Keyword(s):  
Galactic Plane ◽  
Australian Journal ◽  
Contour Maps ◽  
Half Power

Contour maps of 63 regions in the galactic plane are presented. The half-power beamwidth was 4' arc at 5000 MHz. Positions and composite flux densities are given for 206 sources.

scholarly journals 41. The spherical component of the galactic radio emission

1957 ◽  
Vol 4 ◽  
pp. 233-237
Author(s):  
J. E. Baldwin
Keyword(s):  
Radio Emission ◽  
Brightness Temperature ◽  
Radio Telescope ◽  
Galactic Plane ◽  
Wave Length ◽  
Spherical Component ◽  
Long Wave ◽  
Half Power ◽  
Right Ascension ◽  
Galactic Radio

As part of the programme of observations with the large Cambridge radio telescope, a survey of the integrated radio emission has been made using one of the four elements of the interferometer. At a wave-length of 3·7 metres this aerial has beam-widths to half-power points of 2° in right ascension and 15° in declination. The use of a long wave-length makes it possible to obtain accurate measurements of the brightness temperature of the sky in regions away from the galactic plane. It is with the radiation from these regions that this paper is primarily concerned.

Radio Data on Clusters of Galaxies from the Culgoora Circular Array

1983 ◽  
Vol 5 (1) ◽  
pp. 114-129 ◽  
Author(s):  
O. B. Slee ◽  
Betty C. Siegman
Keyword(s):  
Low Frequency ◽  
Radio Sources ◽  
Clusters Of Galaxies ◽  
Circular Array ◽  
Radio Data ◽  
Contour Maps ◽  
Flux Data ◽  
Intensity Measurements ◽  
Half Power ◽  
Selection Of

The Culgoora circular array (CCA) is a 3-km-diameter ring of 96 reflectors operating at 80, 160 and 327 MHz. It has an effective collecting area of ~ 6000 m2 and achieves angular resolutions (full half-power beamwidths) of 3’.70, 1 ‘.85 and 0’.92 at the three operating frequencies. During the interval 1978-1981 we have used the CCA to make 80 and 160 MHz measurements of a comprehensive selection of radio sources which were detected during various complete surveys of clusters of galaxies (see Table 1). We have combined our low-frequency intensity measurements with other available higher-frequency flux data to compute accurate radio spectra. The 160 MHz contour maps for many of the cluster fields were used to find positions and angular sizes for the associated radio sources.

scholarly journals The Miyun 232 MHz General Catalogue: A Reliability and Positional Uncertainties Study

1998 ◽  
Vol 179 ◽  
pp. 91-92
Author(s):  
B. Peng ◽  
W. Yuan ◽  
R. Nan ◽  
Y. Yan
Keyword(s):  
Radio Telescope ◽  
Galactic Plane ◽  
Angular Size ◽  
Radio Sources ◽  
Sky Surveys ◽  
General Catalogue ◽  
Sky Survey

A meter-wave sky survey of the region north of declination +30°, excluding only four fields straddling the Galactic plane (each 8° × 8° in angular size), has been conducted with the Miyun Synthesis Radio Telescope operating at 232 MHz. The reduced Miyun General Catalogue contains 34,426 radio sources in total. To distinguish which sources were not observed by other sky surveys, we first identify sources in the MGC with those in the 6C (151 MHz) catalogue, using a matching radius of 100 arcseconds. The remaining MGC objects were then matched with the B2/B3 (408 MHz), 4C (178 MHz), Texas (365 MHz, 1400 MHz) and 87GB (4.85 GHz) catalogues. 6850 MGC sources were found to lack any radio counterpart in these reference catalogues. It means 19.9% of sources listed in the MGC are probably new.

scholarly journals Galactic Plane H2O Masers: A Southern Survey

1980 ◽  
Vol 33 (1) ◽  
pp. 139 ◽  
Author(s):  
RA Batchelor ◽  
JL Caswell ◽  
WM Goss ◽  
RF Haynes ◽  
SH Knowles ◽  
...  
Keyword(s):  
Radio Telescope ◽  
High Velocity ◽  
Galactic Plane ◽  
Present Series ◽  
General Properties ◽  
Peak Intensity ◽  
Half Power ◽  
Many Sources

An extensive 22 GHz survey of H20 masers has been made with the Parkes 64 m radio telescope. We present data here for 68 sources, of which almost one-half were discovered in the present series of observations. The telescope beamsize, 100' arc to half-power, has enabled us to improve the position measurements of most of the known sources and in a few cases has allowed us to resolve a 'source' into several spatially separated components. The wide velocity coverage of our observations (> 200 km s -1) has led to the discovery of several interesting new high-velocity features. In addition to details for each source, the general properties of the sample are discussed. In the typical interval of 8 months between successive observations, the peak intensity of many sources varied only slightly (by less than a factor of 2); a few sources, however, showed more dramatic variations.

Interplanetary Scintillation Studies at the Molonglo Radio Observatory

1972 ◽  
Vol 2 (2) ◽  
pp. 88-89
Author(s):  
R. G. Milne
Keyword(s):  
Radio Source ◽  
Radio Telescope ◽  
Interplanetary Medium ◽  
Small Diameter ◽  
Line Of Sight ◽  
Radio Sources ◽  
The Sun ◽  
Interplanetary Scintillation ◽  
Radio Observatory ◽  
Half Power

The structure of small diameter radio sources can be investigated by studying the scintillation of the source due to the interplanetary medium when the line of sight approaches the Sun. Observations of radio source scintillation are currently being undertaken with the separate arms of the 1 mile radio telescope at the Molonglo Observatory. The EW arm allows successive transit observations with three fan beams, 1′.4 EW by 4°.2 NS at 408 MHz, bandwidth 2.5 MHz. Sources transit the half-power points of each beam in 6 sec δ seconds of time (δ is the source declination). The NS arm gives eleven fan beams at neighbouring declination, 1′.5 sec Z NS by 4° EW (Z is the zenith angle). Complete transit of a NS beam takes 15 sec δ minutes.

scholarly journals 38. The cambridge survey of radio sources

1957 ◽  
Vol 4 ◽  
pp. 218-220 ◽  
Author(s):  
J. R. Shakeshaft
Keyword(s):  
Radio Telescope ◽  
Wave Length ◽  
Radio Sources ◽  
Polar Diagram ◽  
The North ◽  
Interference Fringes ◽  
Half Power ◽  
The Right ◽  
Right Ascension ◽  
East West

A survey of radio sources at a wave-length of 3·7 metres has been carried out with a large interferometric radio telescope (Ryle and Hewish, 1955) [1] which has a receiving area of about 5000 square metres. Four parabolic troughs are arranged at the corners of a rectangle 600 metres east–west by 50 metres north–south. The reception polar diagram of each, ± 1° by ± 7° to half-power points, is thus filled with interference fringes in the north–south plane as well as the east–west plane. Sources are observed at transit, the time of which gives the right ascension, while the declination is obtained by comparing the observed intensity on successive days as the phase of the north–south pattern is altered.

scholarly journals Line and continuum surveys of the galactic plane with the 100-m telescope

1979 ◽  
Vol 84 ◽  
pp. 80-80
Author(s):  
D. Downes
Keyword(s):  
Galactic Plane ◽  
Radio Sources ◽  
Contour Maps

A new continuum survey of the galactic plane has been made with the Effelsberg 100-m telescope at a frequency of 4.875 GHz with a beamwidth of 2°.6. The data are available in the form of radio contour maps covering ℓ = 357°.5 to 60°, b = ±1°, together with a list of 1186 radio sources. (Altenhoff, Downes, Pauls and Schraml, 1978, Astron. Astrophys. Suppl. 35, 1).

scholarly journals Australian Journal of Physics Astrophysical Supplements Number 22, May 1972

1972 ◽  
Vol 25 (3) ◽  
pp. 339
Author(s):  
REB Munro
Keyword(s):  
Radio Telescope ◽  
Australian Journal ◽  
Radio Sources ◽  
Spectral Indices ◽  
The Mean

Observations at 408 MHz of radio sources from the 4C catalogue. IV. Declination range 20� to 0�. By R. E. B. Munro Abstract. Radio positions and flux densities measured at 408 MHz with the Molonglo radio telescope are given for 1392 sources from the Fourth Cambridge catalogue in the declination range 20� to 0�. The mean spectral indices between 178 and 408 MHz are also considered in the light of these improved flux densities.

scholarly journals Supernova Remnants as Radio Sources

1968 ◽  
Vol 21 (5) ◽  
pp. 739 ◽  
Author(s):  
MJL Kesteven
Keyword(s):  
Spectral Index ◽  
Radio Telescope ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Radio Sources ◽  
Evolutionary Path ◽  
Contour Maps ◽  
Galactic Sources ◽  
Cross Type

The results of a survey with the 1 mile Molonglo cross-type radio telescope of nonthermal galactic sources are discussed in terms of supernova remnant theories. The contour maps obtained indicate that most sources are consistent with a portion of a shell of emission. The results suggest that a remnant's spectral index is independent of its age. A supernova remnant evolutionary path is also derived, and compared with the path predicted by the various theories.

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