A combined optical, infrared and radio study of the megamaser galaxy III ZW 35

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Astronomy, Interacting Galaxies, Interstellar Masers, Radio Astronomy, Seyfert Galaxies, Starburst Galaxies, Active Galactic Nuclei, Astronomical Photometry, Thermal Emission, Very Large Array (Vla), Visible Spectrum, Water Masers

Scientific paper

III Zw 35 is a pair of galaxies characterized by powerful radio continuum, far-infrared and OH maser radiation. A multifrequency study of the galaxy pair based on optical, IR and radio observations has been made. The brighter northern component is identified as an early-type LINER or Seyfert galaxy containing an active nuclear region from which radio continuum, OH maser and thermal dust emission are detected. It is proposed that the northern component has a compact active nucleus deeply embedded in a highly obscured region of approximately 210 pc diameter, within which enhanced star-formation occurs. The lower luminosity southern component is of low mass and is undergoing starburst activity over an extended region of diameter approximately 5.5 kpc. The origin of the starburst and nonthermal activity appears to be an interaction between the two components.

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