Titlebook: Galactic and Extra-Galactic Radio Astronomy; Gerrit L. Verschuur,Kenneth I. Kellermann Book 19741st edition Springer-Verlag New York Inc.

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Ernest H. Y. Chu,Sandra S. Powelld before the 19th century. Historically, objects of this type were called . (Latin for “clouds”) and were the subject of considerable speculation then as they are today. Careful observation with improved telescopes separated these objects into six distinct types : ., the nearest of which can frequen

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https://doi.org/10.1007/978-1-4615-8261-8ctic supernova remnants, pulsars, and neutral hydrogen clouds, as well as observations of the non-thermal galactic background radiation, give information about the magnetic fields in interstellar space. This information is complemented by data on the optical polarization of starlight. Since rigorous

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https://doi.org/10.1007/978-1-4684-0958-1arge optical telescopes is limited to about a half arc second by atmospheric fluctuations, although the diffraction limit is much smaller. However, for radio frequencies a diffraction limit of about 1 arc minute at the highest radio frequencies is currently reached using filled-aperture telescopes.

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