LXXV. The low frequency spectrum of the cygnus (19N4A) and cassiopeia (23N5A) radio sources
- 1 August 1956
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 1 (8) , 725-737
- https://doi.org/10.1080/14786435608238148
Abstract
The intensities of the radio sources in Cygnus (19N4A) and Cassiopeia (23N5A) have been measured at frequencies of 16·5, 19·0, 22·6 and 30·0 Mc/s by using the 218-foot aperture transit radio telescope at Jodrell Bank. The main feature of the results is the abrupt fall in intensity of both sources at frequencies below 22 Mc/s. Possible causes of this behaviour are discussed and it is shown that the effect is probably due to absorption of the radiation in an interstellar HII region of average density and extent.Keywords
This publication has 11 references indexed in Scilit:
- Intensities of Discrete Radio Sources in Cygnus and Cassiopeia at 22.6 Mc.s.Nature, 1954
- XXIX. On the nature of the discrete radio sourcesJournal of Computers in Education, 1954
- The measurement of ionospheric absorption using observations of 18·3 Mc/s cosmic radio noiseJournal of Atmospheric and Terrestrial Physics, 1953
- An Investigation of the H II Regions by a Radio MethodMonthly Notices of the Royal Astronomical Society, 1953
- Problems of Galactic Structure.The Astrophysical Journal, 1952
- Radio Emission From the Andromeda NebulaMonthly Notices of the Royal Astronomical Society, 1951
- The Origin of Galactic Radio-Frequency RadiationMonthly Notices of the Royal Astronomical Society, 1951
- Cosmic Radiation and Radio StarsPhysical Review B, 1950
- LXXVII. The Characteristics of radio-frequency radiation in an ionized gas, with applications to the transfer of radiation in the solar atmosphereJournal of Computers in Education, 1949
- Equivalent path and absorption in an ionospheric regionProceedings of the Physical Society, 1947