Radio continuum observations of the spiral galaxy IC 342

Details Radio continuum observations of the spiral galaxy IC 342 Radio continuum observations of the spiral galaxy IC 342

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..261b&link_type=abstract

Astronomy and Astrophysics, vol. 59, no. 2, July 1977, p. 261-266.

Astronomy and Astrophysics

Astronomy

24

Astronomical Maps, Radio Astronomy, Spiral Galaxies, Thermal Emission, Brightness, Continuous Radiation, Galactic Nuclei, H Ii Regions, Hydrogen Ions, Spatial Distribution, Telescopes

Scientific paper

The spiral galaxy IC 342 has been observed at four frequencies with the Effelsberg 100-m radiotelescope. At 4800 MHz a map was made which has sufficient spatial resolution and temperature sensitivity to show the characteristic spiral structure of IC 342. This map has been combined with a map from the Westerbork Synthesis radiotelescope at 610 MHz to determine the distribution of spectral index across the galaxy. Those areas having a spectrum less steep than the mean are found to coincide with concentrations of H II regions. Additional observations at 1420, 2695 and 8750 MHz are used to delineate more precisely the spectral indices of the nucleus and of IC 342 as a whole.

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