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Are spiral galaxies optically thin or thick?

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arxiv astro-ph/9901158 v1 pith:E5Q7GAZ4 submitted 1999-01-13 astro-ph

E.M. Xilouris , Y.I. Byun , N.D. Kylafis , E.V. Paleologou , J. Papamastorakis This is my paper
classification astro-ph
keywords dustgalaxiesspiralindicatingstarsderivedextinctionface-on
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The opacity of spiral galaxies is examined by modelling the dust and stellar content of individual galaxies. The model is applied to five late-type spiral galaxies (NGC 4013, IC 2531, UGC 1082, NGC 5529 and NGC 5907). Having analyzed a total of seven galaxies thus far, the five galaxies mentioned above plus UGC 2048 and NGC 891 presented in (Xilouris et al. 1997, 1998), we are able to draw some general conclusions, the most significant of which are: 1) The face-on central optical depth is less than one in all optical bands indicating that typical spiral galaxies like the ones that we have modelled would be completely transparent if they were to be seen face-on. 2) The dust scaleheight is about half that of the stars, which means that the dust is more concentrated near the plane of the disk. 3) The dust scalelength is about 1.4 times larger than that of the stars and the dust is more radially extended than the stars. 4) The dust mass is found to be about an order of a magnitude more than previously measured using the IRAS fluxes, indicating the existence of a cold dust component. The gas-to-dust mass ratio calculated is close to the value derived for our Galaxy. 5) The derived extinction law matches quite well the Galactic extinction law, indicating a universal dust behaviour.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. An Integral Field Spectroscopy Study Of Thin And Thick Discs In IC 2531

    astro-ph.GA 2025-07 conditional novelty 4.0 of 10

    IC 2531's geometrically defined thick disc is, on average, older, more metal-poor and similarly alpha-enhanced relative to its thin disc, resembling the Milky Way's chemical discs.

  2. Vertical Structure and Dynamics of a Galactic Disk

    astro-ph.GA 2025-07 conditional novelty 1.0 of 10

    A review of a multi-component disk plus halo model, arguing that gas and dark matter vertically confine the stellar disk, producing steeper-than-sech^2 profiles and flaring.

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