Infrared and radio emission from II ZW 40 and other blue dwarf galaxies

Astronomy and Astrophysics – Astronomy

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Dwarf Galaxies, Emission Spectra, Infrared Spectra, Radio Spectra, Astronomical Catalogs, Astronomical Photometry, Atmospheric Attenuation, Infrared Astronomy Satellite, Spiral Galaxies, Very Large Array (Vla)

Scientific paper

A survey was made of 22 blue dwarf galaxies with the Very Large Array, a good correspondence between the detectability of radio emission and presence in the IRAS Point-Source Catalog was found. New ground-based infrared observations of a number of these galaxies are presented, with an emphasis on II Zw 40 and Markarian 206. II Zw 40 has an infrared-to-blue luminosity ratio of 25, which is among the highest found in the IRAS minisurvey of galaxies; the high value is probably the result of dust extinction close to the source of emission. The radio continuum emission from II Zw 40 includes a strong nonthermal component.

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