scholarly journals Observations of 31 Radio Sources Between 40 and 130 MHz

1968 ◽  
Vol 21 (1) ◽  
pp. 87 ◽  
Author(s):  
RF Haynes ◽  
PA Hamilton
Keyword(s):  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Frequency Range ◽  
Radio Astronomy Observatory ◽  
Source Emission

Recent observations of 31 radio sources in the frequency range 40-130 MHz obtained at the Australian National Radio Astronomy Observatory, Parkes, N.S.W., are reported in this paper. The results obtained show that some useful information about source emission mechanisms may be deduced

scholarly journals The Parkes Catalogue Of Radio Sources Declination Zone 0° To ?20°

1966 ◽  
Vol 19 (6) ◽  
pp. 837 ◽  
Keyword(s):  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory

This paper gives details of 628 radio sources between declinations 0� and - 20� compiled from observations made at 408 Mc/s with the 210 ft reflector at the Australian National Radio Astronomy Observatory, Parkes, N.S.W.

scholarly journals Surveys of Radio Sources at 5 GHz

1977 ◽  
Vol 74 ◽  
pp. 63-74
Author(s):  
I. I. K. Pauliny-Toth
Keyword(s):  
Flux Density ◽  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Max Planck ◽  
Radio Astronomy Observatory ◽  
Density Relation ◽  
Strong Source ◽  
Optical Identifications ◽  
5 Ghz

A number of surveys have been carried out at a frequency of 5 GHz at the National Radio Astronomy Observatory (NRAO) and at the Max-Planck-Institut für Radioastronomie (MPIfR), with the aim of determining the number-flux density relation for the sources detected and also of obtaining their radio spectra and optical identifications. The surveys fall into two categories: first, the strong source (S) surveys, which are intended in due course to cover the whole northern sky and to be complete above a flux density of about 0.6 Jy; second, surveys of limited areas of sky down to lower levels of the flux density.

scholarly journals A survey of spatially and temporally resolved radio frequency interference in the FM band at the Murchison Radio-astronomy Observatory

2020 ◽  
Vol 37 ◽  
Author(s):  
S. J. Tingay ◽  
M. Sokolowski ◽  
R. Wayth ◽  
D. Ung
Keyword(s):  
Radio Frequency ◽  
Radio Astronomy ◽  
Angular Resolution ◽  
Low Frequency ◽  
Earth Orbit ◽  
Radio Frequency Interference ◽  
Astronomy Observatory ◽  
Frequency Range ◽  
Radio Astronomy Observatory ◽  
Imaging Mode

Abstract We present the first survey of radio frequency interference (RFI) at the future site of the low frequency Square Kilometre Array (SKA), the Murchison Radio-astronomy Observatory (MRO), that both temporally and spatially resolves the RFI. The survey is conducted in a 1 MHz frequency range within the FM band, designed to encompass the closest and strongest FM transmitters to the MRO (located in Geraldton, approximately 300 km distant). Conducted over approximately three days using the second iteration of the Engineering Development Array in an all-sky imaging mode, we find a range of RFI signals. We are able to categorise the signals into: those received directly from the transmitters, from their horizon locations; reflections from aircraft (occupying approximately 13% of the observation duration); reflections from objects in Earth orbit; and reflections from meteor ionisation trails. In total, we analyse 33 994 images at 7.92 s time resolution in both polarisations with angular resolution of approximately 3.5 $^{\circ}$ , detecting approximately forty thousand RFI events. This detailed breakdown of RFI in the MRO environment will enable future detailed analyses of the likely impacts of RFI on key science at low radio frequencies with the SKA.

scholarly journals Brightness temperature for radio sources

2007 ◽  
Vol 3 (S245) ◽  
pp. 245-246
Author(s):  
J. H. Fan ◽  
Y. Huang ◽  
Y. Liu ◽  
Y. Gao ◽  
T. X. Hua ◽  
...  
Keyword(s):  
Brightness Temperature ◽  
Radio Astronomy ◽  
Radio Sources ◽  
University Of Michigan ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory ◽  
Brightness Temperatures ◽  
The University

AbstractIn this work, using the database of the university of Michigan Radio Astronomy Observatory (UMRAO), we determined the brightness temperatures, TB for a sample of 167 radio sources. The value of TB is in a range of log TB(K) = 10.46 to 20.08, which suggested that the boosting factors are in a range of δ = 0.41 to 41.26.

scholarly journals The Parkes Catalogue of Radio Sources Declination Zone +20° to +27°

1968 ◽  
Vol 21 (3) ◽  
pp. 377 ◽  
Author(s):  
AJ Shimmins ◽  
GA Day
Keyword(s):  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory

This paper gives details of 397 radio sources between declina.tions + 200 and +270 which were compiled from a finding survey made at 635 MHz with the 210 ft reflector at the Australian National Radio Astronomy Observatory, Parkes, N.S.W.

scholarly journals The VLB array: a new geophysical tool

1988 ◽  
Vol 128 ◽  
pp. 445-451 ◽  
Author(s):  
Edward B. Fomalont
Keyword(s):  
Radio Astronomy ◽  
Environmental Parameters ◽  
Virgin Islands ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory ◽  
Long Baseline ◽  
The Usa ◽  
Very Long Baseline Array

The National Radio Astronomy Observatory is constructing a Very Long Baseline Array (VLBA) consisting of ten antennas across the USA, between Hawaii and the Virgin Islands. The array will be a dedicated instrument for producing milliarcsecond images of radio sources. However, exciting geophysical applications of the array are obvious and, furthermore, detailed geodetic, astrometric and environmental parameters are necessary for the VLBA to achieve its full sensitivity, resolution and positional capabilities.

scholarly journals Observations of 11 Radio Sources Near 55 MHz

1968 ◽  
Vol 21 (4) ◽  
pp. 539
Author(s):  
RF Haynes ◽  
PA Hamilton ◽  
PM McCulloch
Keyword(s):  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Low Frequencies ◽  
Similar Investigation ◽  
Radio Astronomy Observatory

A recent investigation of radio sources in the northern hemisphere was made by Kellermann (1966). He attempted to explain some of the characteristics of the sources that were observed to have c~ed spectra. In order to make a similar investigation possible for sources in the southern hemisphere, more observations especially at low frequencies are needed. Recently surveys have been published at 153 MHz (Hamilton and Haynes 1967) and between 40 and 120 MHz (Haynes and Hamilton 1968). Contuluing these observations, we report here on measurements of 11 radio sources made at the Australian National Radio Astronomy Observatory, Parkes, N.S.W., in January 1968.

Angular Sizes of Radio Sources

1967 ◽  
Vol 1 (1) ◽  
pp. 25-26
Author(s):  
R. Ekers
Keyword(s):  
Radio Astronomy ◽  
Radio Sources ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory

These observations have been made with the 210ft-60ft variable baseline interferometer at the Australian National Radio Astronomy Observatory.

scholarly journals Observations of Some Radio Sources Previously Identified with Clusters of Galaxies

1967 ◽  
Vol 20 (6) ◽  
pp. 725
Author(s):  
HM Tovmassian ◽  
IG Moiseev
Keyword(s):  
Radio Telescope ◽  
Radio Astronomy ◽  
Astronomical Observatory ◽  
Radio Sources ◽  
Clusters Of Galaxies ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory ◽  
The University ◽  
East West

The positions of 33 radio sources previously identified with distant clusters of galaxies were remeasured more accurately to check the identifications. Observations were made at 1410 and 2650 MHz with the 210 ft radio telescope of the Australian National Radio Astronomy Observatory at Parkes, and at 408 MHz with the east-west arm of the Mills Cross at the Molonglo Radio Astronomical Observatory of the University of Sydney. It was found that 21 sources are situated within 5 min of arc of the centres of the corresponding clusters.

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