Radio-frequency Radiation from the Great Nebula in Andromeda (M.31).

  title={Radio-frequency Radiation from the Great Nebula in Andromeda (M.31).},
  author={R. Hanbury Brown and Cyril Hazard},
THE experiments of Bolton and Stanley1, and of Ryle and Smith2,3, using a radio interferometer have shown that a significant part of the extra-terrestrial radio noise is associated with point sources with diameters of less than 6 minutes of arc. Although the majority of these sources are unidentified with visual objects, their distribution indicates that they lie in our own galaxy. Attempts to detect radio emissions from specific extra-galactic objects have hitherto been unsuccessful. In this… 
Radio-Frequency Radiation from the Spiral Nebula Messier 81
FOLLOWING the detection1 of radio-frequency radiation from the Great Nebula in Andromeda M.31, the 218-ft. paraboloid at the Jodrell Bank Experimental Station has been used for continuing the
Radio-Frequency Radiation from Tycho Brahe's Supernova (A.D. 1572)
SINCE the discovery of localized sources of extraterrestrial radio-frequency radiation in 19481, surveys have been carried out over the whole sky2,3, and the positions and intensities of about one
XIII. Extra-galactic radio-frequency radiation
Summary It has been shown previously that radio-frequency radiation is being received on the earth from the extra-galactic nebula N.G.C. 224 (M. 31). This paper reports some initial attempts to
On the Discovery of Extragalactic Radio Sources
The first measurements of the cosmic radio emission by Jansky! and Reber" showed that there was a reasonably close similarity between the intensity contours and the overall galactic structure. The
Solare und kosmische Radiowellen
A short summary is given of the more important results and problems of the new branch of research in radio-astronomy. The solar radio frequency radiation can be traced back to 3 different components
Radio-Astronomy and Navigation
  • C. M. Cade
  • Physics
    The Journal of the Royal Aeronautical Society
  • 1958
The difficulties of determining latitude and longitude under adverse weather conditions, when neither the Sun nor stars can be sighted, are well-known, and the advantages of a non-visual system of
The Contribution of the Division of Radiophysics Potts Hill Field Station to International Radio Astronomy
During the 1950s Australia was one of the world’s foremost astronomical nations owing primarily to the work of the dynamic Radio Astronomy Group within the Commonwealth Scientific and Industrial
Extragalactic radio continuum surveys and the transformation of radio astronomy
This Review traces the evolution of extragalactic radio continuum surveys from the earliest days of radio astronomy to the present, and identifies the challenges that must be overcome to achieve this transformational change.
The Sequence of Events that led to the 1963 Publications in Nature of 3C 273, the First Quasar and the First Extragalactic Radio Jet
Abstract We have undertaken a detailed investigation, based on the available evidence, of the sequence of events that led to the historical discovery of the first quasar, 3C 273.
Challenging Collections: Approaches to the Heritage of Recent Science and Technology
This most recent volume in the Artefacts series, Challenging Collections: Approaches to the Heritage of Recent Science and Technology , focuses on the question of collecting post–World War II


A New Intense Source of Radio-Frequency Radiation in the Constellation of Cassiopeia
THE discovery by Hey, Parsons and Phillips1,2 of a variable source of radio-frequency radiation in the constellation of Cygnus suggested that at least part of the galactic radiation was due to very
An investigation of radio-frequency radiation from the sun
  • M. RyleD. Vonberg
  • Physics
    Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
  • 1948
A special type of aerial has been devised which enables the solar radiation to be recorded separately from the galactic radiation, and so enables continuous observation of the sun to be made with aerials of comparatively low directivity.
Variable Source of Radio Frequency Radiation in the Constellation of Cygnus
COSMIC or galactic noise was discovered by Jansky1 in 1931; but its exact origin has remained uncertain. It is generally supposed to originate from collisions in interstellar matter2; but there are