Volume 471, Number 3, September I 2007
|Page(s)||765 - 773|
|Published online||26 June 2007|
Radiative transfer fits of V and K′-band images
INAF – Istituto di Radioastronomia, Sezione di Firenze, Largo Enrico Fermi 5, 50125 Firenze, Italy e-mail: firstname.lastname@example.org
Accepted: 3 May 2007
Aims.I have analyzed a sample of seven nearby edge-on galaxies observed in the V and K'-bands, in order to infer the properties of the dust distribution.
Methods.A radiative transfer model, including scattering, was used to decompose each image into a stellar disk, a bulge, and a dust disk. The parameters describing the distributions were obtained through standard minimization techniques.
Results.The dust disks fitted to the V-band images are consistent with previous work in the literature: the radial scalelength of dust is larger than for stars (); the dust disk has a smaller vertical scalelength than the stellar (); the dust disk is almost transparent when seen face-on (central, face-on, optical depth ). Equivalent fits can be produced using faster radiative transfer models that neglect scattering. In the K'-band, no trace is found of a second, massive, dust disk, which has been invoked to explain observations of dust emission in the submillimeter. I discuss the model degeneracies and the effect of complex structures on the fitted distributions. In particular, most bulges in the sample show a box/peanuts morphology with large residuals; two lower-inclination galaxies show a dust ring distribution, which could be the cause of the large, fitted, dust scalelengths.
Key words: dust, extinction / galaxies: ISM / galaxies: stellar content / galaxies: spiral
Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias
© ESO, 2007
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