Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-21
Mon.Not.Roy.Astron.Soc. 359 (2005) 589-596
Astronomy and Astrophysics
Astrophysics
9 pages, 7 figures
Scientific paper
10.1111/j.1365-2966.2005.08923.x
We present a spectroscopic study of the shape of the dust-extinction law between 1.0 and 2.2um towards a set of nine ultracompact HII regions with Av > 15 mag. We find some evidence that the reddening curve may tend to flatten at higher extinctions, but just over half of the sample has extinction consistent with or close to the average for the interstellar medium. There is no evidence of extinction curves significantly steeper than the standard law, even where water ice is present. Comparing the results to the predictions of a simple extinction model, we suggest that a standard extinction law implies a robust upper limit to the grain-size distribution at around 0.1 - 0.3um. Flatter curves are most likely due to changes in this upper limit, although the effects of flattening due to unresolved clumpy extinction cannot be ruled out.
Lumsden Stuart L.
Moore Toby J. T.
Puxley Phil J.
Ridge Naomi A.
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