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Extraplanar Dust in Spiral Galaxies: Observations and Implications | | J. Christopher Howk
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5 Oct 1999 | | Journal: | Astrophys.Space Sci. 269 (1999) 293-300 | | Subject: | astro-ph | | Affiliation: | Johns Hopkins | | Abstract: | Recent optical and submillimeter observations have begun to probe the existence of dust grains in the halos of spiral galaxies. I review our own work in this area which employs high-resolution optical images of edge-on spiral galaxies to trace high-z dust in absorption against the background stellar light of the galaxies. We have found that a substantial fraction of such galaxies (>50%) show extensive webs of dust-bearing clouds to heights z>2 kpc. Extraplanar dust in galaxies is statistically correlated with extraplanar diffuse ionized gas, though there is no evidence for a direct, physical relationship between these two phases of the high-z interstellar medium. The dense high-z clouds individually have masses estimated to be >10^5} to 10^6 solar masses. The detailed properties of the observed dust structures suggest the clouds seen in our images may represent the dense phase of a multiphase ISM at high-z. Such dense clouds can have an important effect on the observed light distribution in spiral galaxies. I discuss the effects such high-z dust can have on quantitative measures of the vertical structure of stars and ionized gas in edge-on systems. | | Source: | arXiv, astro-ph/9910092 | | Services: | Forum | Review | PDF | Favorites | |
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