Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168...65k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 65-68.
Astronomy and Astrophysics
Astronomy
19
Astronomical Spectroscopy, Brightness Distribution, Continuous Spectra, Dwarf Galaxies, Radio Sources (Astronomy), Surface Properties, Compact Galaxies, Spectrum Analysis, Spiral Galaxies, Star Formation, Star Formation Rate
Scientific paper
A sample of 45 dwarf galaxies, mostly Im or Sm and located within 10 Mpc distance, have been observed in the radio continuum at 4.75 GHz using the Effelsberg 100-m telescope. Twenty galaxies have been detected (≡40%) with a sensitivity of 0.7 - 0.9 mJy/beam area. The bulk of the objects can be considered as scaled-down versions of normal spiral galaxies as far as their radio luminosities are concerned. The two brightest galaxies in the sample, DDO 52 and NGC 4299, have additionally been measured with the 100-m telescope at 24.5 GHz, from which spectral indices of -0.25±0.24 and -0.36±0.28 (Sν ≡ να) respectively are derived. A comparison with blue compact dwarf galaxies reveals that the star formation rate in the present sample is comparatively rather low as expected.
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