Abstract
The Sombrero galaxy (NGC 4594) is an Sa galaxy with a symmetric dust ring. We have used the Large APEX BOlometer CAmera (LABOCA) at 870 μm and the MAx-Planck Millimeter BOlometer (MAMBO-2) at 1.2 mm to detect the dust ring for the first time at submillimetre and millimetre wavelengths. We have constructed a model of the galaxy to separate the active galactic nucleus (AGN) and dust ring components. The ring radius at both 870 μm and 1.2 mm agrees well with the radius determined from optical absorption and atomic gas studies. The spectral energy distribution of the ring is well fitted by a single grey-body with dust emissivity index β = 2 and a dust temperature T d = 18.4 K. The dust mass of the ring is found to be 1.6 ± 0.2 x 10 7 M ⊙ which, for a Galactic gas-to-dust ratio, implies a gas mass that is consistent with measurements from the literature.
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