A sensitive radio continuum survey of low surface brightness dwarf galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dwarf Galaxies, Radio Emission, Sky Surveys (Astronomy), Stellar Spectra, Magnetic Fields, Radio Astronomy, Stellar Luminosity, Stellar Magnitude

Scientific paper

The paper reports observations at 4.75 GHz, made with the Effelsberg 100-m telescope, of a sample of 128 low-surface brightness dwarf galaxies (LSBDGs), selected mainly from the UGC catalog. The detection rate (16 percent of the galaxies) is much lower than that of 'active' dwarf galaxies such as blue compact dwarf galaxies. The radio luminosity of the surveyed LSBDGs correlates with, and is roughly proportional to, their blue luminosity in a way indistinguishable from the correlation observed in giant spirals, confirming an earlier made suggestion that, as far as the general radio continuum properties are concerned, LSBDGs behave as scaled-down versions of spirals. Spectral indices were derived or estimated for 11 LSDGs on the basis of the present and previous radio continuum surveys.

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