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 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 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 An Aperture Synthesis Survey of the Galactic Plane

1974 ◽  
Vol 27 (5) ◽  
pp. 687 ◽  
Author(s):  
BB Jones ◽  
EA Finlay
Keyword(s):  
Brightness Temperature ◽  
Supernova Remnants ◽  
Galactic Plane ◽  
Absolute Temperature ◽  
Temperature Profiles ◽  
Contour Maps ◽  
Average Value ◽  
Low Surface Brightness ◽  
Carina Nebula ◽  
The Galaxy

The results of a survey already published have been used to construct contour maps and ruled surface diagrams of the brightness temperature at 29�9 MHz near the galactic plane between I = 225� and 30�. The angular resolution was 0�� 8 at the zenith, and the range of zenith angles involved was � 30�. Restoration of the background was achieved with the aid of a low resolution filled-aperture survey carried out by others. The brightness temperature scale was calibrated absolutely. The optical depth of the Galaxy in directions within 40� of latitude from the centre has been estimated by a method which relies only on the shapes of brightness temperature profiles and not on absolute temperature calibrations. If an electron temperature is assumed, r.m.s. electron densities can be deduced. The average value of the disc emissivity at 29�9 MHz and the value of its spectral index have been calculated from brightness temperature profiles observed at a number of different frequencies, calibrations being required for these purposes. About 29 discrete absorption regions have been observed and identified with optically observed HII regions, and the fact that these are all nearer than 4 kpc permits a choice between kinematic distances in two cases. The Carina nebula and RCW 108 lend themselves to the measurement of local emissivities, and values of these together with their implications have already been published. A number of previously unlisted nonthermal sources have been observed, many of which are objects of low surface brightness and probably are supernova remnants.

scholarly journals A motion picture film of galactic 21-cm line emission

1970 ◽  
Vol 38 ◽  
pp. 122-125 ◽  
Author(s):  
G. Westerhout
Keyword(s):  
Galactic Plane ◽  
Line Emission ◽  
Neutral Hydrogen ◽  
Hydrogen Distribution ◽  
Motion Picture Film ◽  
Contour Maps ◽  
Latitude Range ◽  
The Galaxy ◽  
Line Survey ◽  
Line Work

Since 1964 we have been observing 21-cm line profiles in a new survey of the neutral hydrogen distribution in the neighborhood of the galactic plane with the 300-foot radio telescope of the National Radio Astronomy Observatory in Green Bank, W.Va. This is the largest telescope available for 21-cm line work; it has a beamwidth of 10 min of arc and is equipped with an excellent line receiver. Since it seems unlikely that an extensive hydrogen-line survey will be made with any larger telescope, we felt that for reference purposes a concerted effort should be made to obtain as many 21-cm data as possible pertaining to the structure of the Galaxy with this telescope. The data have been presented in the form of contour maps giving the intensity of the 21-cm line radiation as a function of right-ascension and velocity at constant declination. A series of contour maps was distributed to the astronomical community in 1966 as the first edition of the Maryland–Green Bank Galactic 21-cm Line Survey. The second edition, containing 1200 pages and approximately 1800 maps, was distributed in the summer and fall of 1969. It is expected that additional contour maps, completing the survey as originally planned, covering a latitude range from bII = +1° to −1°, lII = 11° to 235° (bII = +3° to −3° between lII = 100° and 145°), will be finished by the summer of 1970. Scans were made across the galactic equator with a stationary telescope, so that the declination is constant through each scan; the declination intervals varied from 4 to 6 min of arc. Eventually, we plan to cover a strip from bII = +5° to −5° between lII = 11° and 235°, containing 225000 independent points at intervals of 6 min of arc, with an effective beamwidth of 12.5 min of arc, a velocity resolution of 2 km s-1, and a total of 1.2 × 108 individual intensities.

scholarly journals Observations of the General Background and Discrete Sources of 18·3 Mc/s Cosmic Noise

1954 ◽  
Vol 7 (1) ◽  
pp. 130 ◽  
Author(s):  
CA Shain ◽  
CS Higgins
Keyword(s):  
Galactic Plane ◽  
Beam Width ◽  
Background Distribution ◽  
Broad Strip ◽  
Cosmic Noise ◽  
Half Power

A survey of a broad strip of the sky, centred on Dec. ?32�, has been made at a frequency of 18�3 Mc/s using an aerial with an overall beam width to half-power of 17�. Previous results concerning the background distribution of brightness have been confirmed and 37 discrete sources have been detected. The distribution of these sources shows some galactic concentration ; it becomes homogeneous if sources within 18� of the galactic plane are excluded.

scholarly journals Australian Journal of Physics Astrophysical Supplements

1969 ◽  
Vol 22 (6) ◽  
pp. 843
Keyword(s):  
Flux Density ◽  
Milky Way ◽  
Australian Journal ◽  
Peak Temperature ◽  
Contour Maps

This paper presents contour maps of the region of the Milky Way between longitudes 88� and 307�, latitudes �2� at 2650 MHz. A list of sources with values of peak temperature nd flux density is given.

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.

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 A Southern Hemisphere Survey of the Galactic Plane at 5 GHz

1978 ◽  
Vol 31 (4) ◽  
pp. 351
Author(s):  
RF Haynes ◽  
JL Caswell ◽  
LWJ Simons
Keyword(s):  
Detection Limit ◽  
Southern Hemisphere ◽  
Galactic Plane ◽  
Point Sources ◽  
Half Power ◽  
5 Ghz ◽  
Better Than

Seventy five maps are presented showing the 5 GHz emission from the galactic plane in the range I = 190� ~ 360� .... 40� for - 2� < b < 2� (an area of approximately 600 square egrees). The method of observing and the computer reduction of the data are discussed. the telescope resolution is 4'�1 arc to half-power points and the detection limit for point sources is better than 0�5 Jy.

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