SIMBAD references

The Sombrero galaxy (NGC4594) is an Sa galaxy with a symmetric dust ring. We have used the Large APEX BOlometer CAmera (LABOCA) at 870µm and the MAx-Planck Millimeter BOlometer (MAMBO-2) at 1.2mm 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 870µm and 1.2mm 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=18.4K. The dust mass of the ring is found to be 1.6±0.2x10⁷M_☉ which, for a Galactic gas-to-dust ratio, implies a gas mass that is consistent with measurements from the literature.