Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sciam.238...74h&link_type=abstract
Scientific American, vol. 238, Jan. 1978, p. 74-84.
Astronomy and Astrophysics
Astronomy
4
Astronomical Photography, Hydrogen Clouds, Interstellar Gas, Radio Astronomy, Gas Expansion, Hydrogen Atoms, Interstellar Magnetic Fields
Scientific paper
The results of astronomical studies conducted at a radio wavelength of about 21 cm with the aid of a 26-m radio telescope are discussed. In the investigations the employment of a recently developed machine made it possible to synthesize 'photographs' on the basis of the recorded digital data. The recorded radiation is emitted by interstellar atomic hydrogen and provides information concerning the distribution of the gas over the entire sky. A synthetic photograph of the interstellar medium presented reveals that the gas of the medium loops through interstellar space in long filaments. The filaments are aligned with the magnetic field of the galaxy. Elliptical rings of gas can be seen in two other synthetic photographs. It is shown that such elliptical or circular features could be produced in connection with a radially expanding shell of gas in interstellar space. Mechanisms considered for producing an expanding shell of gas involve an interstellar wind or a supernova.
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