Non-thermal radio astronomy
MetadataShow full item record
© 2013 Elsevier B.V. All rights reserved. This presentation starts with Karl Jansky's discovery of cosmic radio emission in 1933 and notes the striking similarities to Hess's discovery of cosmic-rays in 1912. At first it was assumed that this radio emission was thermal but in 1939 Grote Reber discovered that it was stronger at longer wavelengths, requiring a non-thermal emission process. These discoveries had a revolutionary impact on astronomy and radio astronomy was born. The interpretation of this non-thermal radiation as synchrotron emission from high energy particles in the interstellar medium did not occur until the late 1940s but then it provided the link between radio astronomy and cosmic-ray research. Ginzburg, in particular, saw that cosmic-ray astrophysics was now possible using radio waves to trace sources of cosmic-rays. We discuss the discovery of extragalactic active galactic nuclei leading to the discovery of quasars and the first evidence for black holes in the nuclei of galaxies. We summarise the present status and future of some of the main radio telescopes used to image the non-thermal emission from external galaxies. Finally, we include a short description of the use of radio signals for the direct detection of cosmic-rays and UHE neutrinos.
Showing items related by title, author, creator and subject.
Interpretation of radio continuum and molecular line observations of Sgr B2: Free-free and synchrotron emission, and implications for cosmic raysProtheroe, R.; Ott, J.; Ekers, Ronald; Jones, D.; Crocker, R. (2008)Recent ammonia (1,1) inversion line data on the Galactic star-forming region Sgr B2 show that the column density is consistent with a radial Gaussian density profile with a standard deviation of 2.75 pc. Deriving a formula ...
Fichtinger, B.; Güdel, M.; Mutel, R.; Hallinan, G.; Gaidos, E.; Skinner, S.; Lynch, Christene; Gayley, K. (2017)Aims. Observations of free-free continuum radio emission of four young main-sequence solar-type stars (EK Dra, p1UMa, ?1Ori, and ?1Cet) are studied to detect stellar winds or at least to place upper limits on their thermal ...
Galvin, T.; Seymour, Nick; Filipovic, M.; Tothill, N.; Marvil, J.; Drouart, G.; Symeonidis, M.; Huynh, M. (2016)© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.The intrinsic thermal (free-free) and non-thermal (synchrotron) emission components that comprise the radio continuum of ...