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Date and Time of the Query: 2019-05-20 T18:54:34 PDT
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For refcode 2007A&A...471..765B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2007A&A...471..765B The dust distribution in edge-on galaxies. Radiative transfer fits of V and K'-band images Bianchi, S. Abstract. 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 {chi}^2^ 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 (h_d/h_s_ ~ 1.5); the dust disk has a smaller vertical scalelength than the stellar (z_d/z_s_ ~ 1/3); the dust disk is almost transparent when seen face-on (central, face-on, optical depth {tau}_0_ =0.5-1.5). 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
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