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LABOCA and MAMBO-2 imaging of the dust ring of the Sombrero galaxy (NGC 4594)

2008; EDP Sciences; Volume: 485; Issue: 3 Linguagem: Inglês

10.1051/0004-6361

1432-0746

C. Vlahakis, M. Baes, G. J. Bendo, A. Lundgren,

Spectroscopy and Laser Applications

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 and a dust temperature K. The dust mass of the ring is found to be which, for a Galactic gas-to-dust ratio, implies a gas mass that is consistent with measurements from the literature.