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Title: Astronomy/Galaxies - Dust in Spiral Galaxies HST and ISO Results.
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Dust in Spiral Galaxies

Dust in Spiral Galaxies

There has been considerable controversy about the dust content ofspiral galaxies, with some new results casting doubt on the traditionalassumption that its effects on emerging light are relatively minor.Trying to avoid some of the pitfalls of modelling and statistics onsuch complex systems, Ray White III and I have been exploring the use ofgalaxy overlaps to measure the dust extinction in an unusuallydirect way. As background to the current HST and ISO observations,you may wish to peruse a WWW poster paper on our ground-based resultsthat Ray prepared for a 1996 meeting in South Africa. It's important tounderstand dust in galaxies because it can have a profound effect onhow we see them, and thus on how we interpret such diverse mattersas the amount of dark matter galaxies contain, how may quasarsdo or don't exist in the early Universe, and how the different componentsof interstellar matter interact with each other and with stars at thebeginning and end of their lives. More details (and lots of them)can be found in my course lecture on dust in galaxies. For a nice example of usingdust to trace mass transfer between interacting galaxies, see thesection on HST imaging and interpretation ofNGC 1409/10.

HST and ISO Results

Read the press release on the HST and ISO results presented at theJanuary 1998 meeting of the American Astronomical Society.The accompanying pictures are available in several forms:
 

HST

and

ISO

Results.

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